{"id":3846,"date":"2024-01-13T15:18:31","date_gmt":"2024-01-13T07:18:31","guid":{"rendered":"http:\/\/www.ponybai.com\/?p=3846"},"modified":"2023-12-02T15:20:27","modified_gmt":"2023-12-02T07:20:27","slug":"%e4%b8%8e%e4%ba%8b%e4%bb%b6%e9%80%9a%e4%bf%a1","status":"publish","type":"post","link":"http:\/\/www.ponybai.com\/?p=3846","title":{"rendered":"\u4e0e\u4e8b\u4ef6\u901a\u4fe1"},"content":{"rendered":"\n<p>Lightning Web \u7ec4\u4ef6\u8c03\u5ea6\u6807\u51c6 DOM \u4e8b\u4ef6\u3002\u7ec4\u4ef6\u8fd8\u53ef\u4ee5\u521b\u5efa\u548c\u8c03\u5ea6\u81ea\u5b9a\u4e49\u4e8b\u4ef6\u3002\u4f7f\u7528\u4e8b\u4ef6\u5411\u4e0a\u4f20\u8fbe\u7ec4\u4ef6\u5305\u542b\u5c42\u6b21\u7ed3\u6784\u3002\u4f8b\u5982\uff0c\u5b50\u7ec4\u4ef6 \u8c03\u5ea6\u4e00\u4e2a\u4e8b\u4ef6\uff0c\u4ee5\u544a\u77e5\u5176\u7236\u7ec4\u4ef6 \uff0c\u7528\u6237\u9009\u62e9\u4e86\u5b83\u3002<code>c-todo-item<\/code><code>c-todo-app<\/code><\/p>\n\n\n\n<p>Lightning Web \u7ec4\u4ef6\u4e2d\u7684\u4e8b\u4ef6\u57fa\u4e8e DOM \u4e8b\u4ef6\u6784\u5efa\uff0cDOM \u4e8b\u4ef6\u662f\u6bcf\u4e2a\u6d4f\u89c8\u5668\u4e2d\u53ef\u7528\u7684 API \u548c\u5bf9\u8c61\u7684\u96c6\u5408\u3002<\/p>\n\n\n\n<p>DOM \u4e8b\u4ef6\u7cfb\u7edf\u662f\u4e00\u79cd\u5305\u542b\u8fd9\u4e9b\u5143\u7d20\u7684\u7f16\u7a0b\u8bbe\u8ba1\u6a21\u5f0f\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4e8b\u4ef6\u540d\u79f0\uff0c\u79f0\u4e3a\u7c7b\u578b<\/li>\n\n\n\n<li>\u7528\u4e8e\u521d\u59cb\u5316\u4e8b\u4ef6\u7684\u914d\u7f6e<\/li>\n\n\n\n<li>\u53d1\u51fa\u4e8b\u4ef6\u7684 JavaScript \u5bf9\u8c61<\/li>\n<\/ul>\n\n\n\n<p>\u8981\u521b\u5efa\u4e8b\u4ef6\uff0c\u6211\u4eec\u5f3a\u70c8\u5efa\u8bae\u4f7f\u7528\u754c\u9762\u3002\u5728 Lightning Web \u7ec4\u4ef6\u4e2d\uff0c\u63d0\u4f9b\u8de8\u6d4f\u89c8\u5668\u7684\u66f4\u4e00\u81f4\u7684\u4f53\u9a8c\u3002\u5b83\u4e0d\u9700\u8981\u8bbe\u7f6e\u6216\u6837\u677f\uff0c\u5b83\u5141\u8bb8\u60a8\u901a\u8fc7\u5c5e\u6027\u4f20\u9012\u4efb\u4f55\u7c7b\u578b\u7684\u6570\u636e\uff0c\u8fd9\u4f7f\u5f97\u5b83\u5f88\u7075\u6d3b\u3002<code>CustomEvent<\/code><code>CustomEvent<\/code><code>detail<\/code><\/p>\n\n\n\n<p>Lightning Web \u7ec4\u4ef6\u5b9e\u73b0\u4e86\u8be5\u63a5\u53e3\uff0c\u5141\u8bb8\u5b83\u4eec\u8c03\u5ea6\u4e8b\u4ef6\u3001\u4fa6\u542c\u4e8b\u4ef6\u548c\u5904\u7406\u4e8b\u4ef6\u3002<code>EventTarget<\/code><\/p>\n\n\n\n<p>\u63d0\u793a<\/p>\n\n\n\n<p>\u82e5\u8981\u5411\u4e0b\u901a\u4fe1\u7ec4\u4ef6\u5305\u542b\u5c42\u6b21\u7ed3\u6784\uff0c\u8bf7\u901a\u8fc7 HTML \u5c5e\u6027\u5c06\u5c5e\u6027\u4f20\u9012\u7ed9\u5b50\u7ea7\uff0c\u6216\u8c03\u7528\u5176\u516c\u5171\u65b9\u6cd5\u3002\u8981\u5728\u7ec4\u4ef6\u4e4b\u95f4\u8fdb\u884c\u901a\u4fe1\uff0c\u8bf7\u4f7f\u7528\u00a0Lightning \u6d88\u606f\u670d\u52a1\u6216\u53d1\u5e03\u8ba2\u9605\u5b9e\u7528\u7a0b\u5e8f\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"create-and-dispatch-events\">\u521b\u5efa\u548c\u8c03\u5ea6\u4e8b\u4ef6<\/h2>\n\n\n\n<p>\u5728\u7ec4\u4ef6\u7684 JavaScript \u7c7b\u4e2d\u521b\u5efa\u548c\u8c03\u5ea6\u4e8b\u4ef6\u3002\u82e5\u8981\u521b\u5efa\u4e8b\u4ef6\uff0c\u8bf7\u4f7f\u7528\u6784\u9020\u51fd\u6570\u3002\u82e5\u8981\u8c03\u5ea6\u4e8b\u4ef6\uff0c\u8bf7\u8c03\u7528\u8be5\u65b9\u6cd5\u3002<code>CustomEvent()<\/code><code>EventTarget.dispatchEvent()<\/code><\/p>\n\n\n\n<p>\u6784\u9020\u51fd\u6570\u6709\u4e00\u4e2a\u5fc5\u9700\u7684\u53c2\u6570\uff0c\u8be5\u53c2\u6570\u662f\u6307\u793a\u4e8b\u4ef6\u7c7b\u578b\u7684\u5b57\u7b26\u4e32\u3002\u4f5c\u4e3a\u7ec4\u4ef6\u4f5c\u8005\uff0c\u60a8\u53ef\u4ee5\u5728\u521b\u5efa\u4e8b\u4ef6\u65f6\u547d\u540d\u4e8b\u4ef6\u7c7b\u578b\u3002\u60a8\u53ef\u4ee5\u4f7f\u7528\u4efb\u4f55\u5b57\u7b26\u4e32\u4f5c\u4e3a\u4e8b\u4ef6\u7c7b\u578b\u3002\u4f46\u662f\uff0c\u6211\u4eec\u5efa\u8bae\u60a8\u9075\u5b88 DOM \u4e8b\u4ef6\u6807\u51c6\u3002<code>CustomEvent()<\/code><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6ca1\u6709\u5927\u5199\u5b57\u6bcd<\/li>\n\n\n\n<li>\u65e0\u7a7a\u683c<\/li>\n\n\n\n<li>\u4f7f\u7528\u4e0b\u5212\u7ebf\u5206\u9694\u5355\u8bcd<\/li>\n<\/ul>\n\n\n\n<p>\u4e0d\u8981\u5728\u4e8b\u4ef6\u540d\u79f0\u524d\u9762\u52a0\u4e0a\u5b57\u7b26\u4e32 \uff0c\u56e0\u4e3a\u5185\u8054\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u540d\u79f0\u5fc5\u987b\u4ee5\u5b57\u7b26\u4e32 \u5f00\u5934\u3002\u5982\u679c\u8c03\u7528\u4e8b\u4ef6\uff0c\u5219\u6807\u8bb0\u5c06\u4e3a \u3002\u6ce8\u610f\u53cc\u500d\u7684\u5355\u8bcd\uff0c\u8fd9\u5f88\u4ee4\u4eba\u56f0\u60d1\u3002<code>on<\/code><code>on<\/code><code>onmessage<\/code><code>&lt;c-my-component ononmessage={handleMessage}&gt;<\/code><code>onon<\/code><\/p>\n\n\n\n<p>\u4f7f\u7528\u81ea\u5b9a\u4e49\u4e8b\u4ef6\u8fdb\u884c\u8de8\u7ec4\u4ef6\u901a\u4fe1<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-rich\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/youtube.com\/watch?v=hIv22aTl3-g\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u793a\u4f8b\uff1a\u8c03\u5ea6\u548c\u5904\u7406\u4e8b\u4ef6<\/h2>\n\n\n\n<p>\u8ba9\u6211\u4eec\u8df3\u5230\u4e00\u4e9b\u4ee3\u7801\u4e2d\u3002<\/p>\n\n\n\n<p>\u8be5\u7ec4\u4ef6\u5305\u542b\u201c<strong>\u4e0a\u4e00\u4e2a<\/strong>\u201d\u548c\u201c<strong>\u4e0b\u4e00\u4e2a<\/strong>\u201d\u6309\u94ae\u3002\u5f53\u7528\u6237\u5355\u51fb\u6309\u94ae\u65f6\uff0c\u7ec4\u4ef6\u5c06\u521b\u5efa\u5e76\u8c03\u5ea6\u4e8b\u4ef6\u3002\u60a8\u53ef\u4ee5\u5c06\u7ec4\u4ef6\u62d6\u653e\u5230\u9700\u8981\u201c<strong>\u4e0a\u4e00\u4e2a<\/strong>\u201d\u548c\u201c<strong>\u4e0b\u4e00\u4e2a<\/strong>\u201d\u6309\u94ae\u7684\u4efb\u4f55\u7ec4\u4ef6\u4e2d\u3002\u8be5\u7236\u7ec4\u4ef6\u4fa6\u542c\u4e8b\u4ef6\u5e76\u5904\u7406\u5b83\u4eec\u3002<code>c-paginator<\/code><code>previous<\/code><code>next<\/code><code>paginator<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- paginator.html --&gt;\n&lt;template&gt;\n  &lt;lightning-layout&gt;\n    &lt;lightning-layout-item&gt;\n      &lt;lightning-button\n        label=\"Previous\"\n        icon-name=\"utility:chevronleft\"\n        onclick={previousHandler}\n      &gt;&lt;\/lightning-button&gt;\n    &lt;\/lightning-layout-item&gt;\n    &lt;lightning-layout-item flexibility=\"grow\"&gt;&lt;\/lightning-layout-item&gt;\n    &lt;lightning-layout-item&gt;\n      &lt;lightning-button\n        label=\"Next\"\n        icon-name=\"utility:chevronright\"\n        icon-position=\"right\"\n        onclick={nextHandler}\n      &gt;&lt;\/lightning-button&gt;\n    &lt;\/lightning-layout-item&gt;\n  &lt;\/lightning-layout&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<p>\u5f53\u7528\u6237\u5355\u51fb\u6309\u94ae\u65f6\uff0c\u5c06\u6267\u884c or \u51fd\u6570\u3002\u8fd9\u4e9b\u51fd\u6570\u521b\u5efa\u548c\u8c03\u5ea6 \u548c \u4e8b\u4ef6\u3002<code>previousHandler<\/code><code>nextHandler<\/code><code>previous<\/code><code>next<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ paginator.js\nimport { LightningElement } from \"lwc\";\n\nexport default class Paginator extends LightningElement {\n  previousHandler() {\n    this.dispatchEvent(new CustomEvent(\"previous\"));\n  }\n\n  nextHandler() {\n    this.dispatchEvent(new CustomEvent(\"next\"));\n  }\n}<\/code><\/pre>\n\n\n\n<p>\u8fd9\u4e9b\u4e8b\u4ef6\u662f\u7b80\u5355\u7684\u201c\u67d0\u4e8b\u53d1\u751f\u201d\u4e8b\u4ef6\u3002\u5b83\u4eec\u4e0d\u4f1a\u5c06\u6570\u636e\u6709\u6548\u8d1f\u8f7d\u4f20\u9012\u5230 DOM \u6811\u4e0a\uff0c\u5b83\u4eec\u53ea\u662f\u5ba3\u5e03\u7528\u6237\u5355\u51fb\u4e86\u4e00\u4e2a\u6309\u94ae\u3002<\/p>\n\n\n\n<p>\u8ba9\u6211\u4eec\u8fdb\u5165\u4e00\u4e2a\u540d\u4e3a \u7684\u7ec4\u4ef6\uff0c\u5b83\u4fa6\u542c\u5e76\u5904\u7406 \u548c \u4e8b\u4ef6\u3002<code>paginator<\/code><code>c-event-simple<\/code><code>previous<\/code><code>next<\/code><\/p>\n\n\n\n<p>\u8981\u4fa6\u542c\u4e8b\u4ef6\uff0c\u8bf7\u4f7f\u7528\u8bed\u6cd5\u4e3a \u7684 HTML \u5c5e\u6027\u3002\u7531\u4e8e\u6211\u4eec\u7684\u4e8b\u4ef6\u7c7b\u578b\u662f \u548c \uff0c\u56e0\u6b64\u4fa6\u542c\u5668\u662f \u548c \u3002<code>oneventtype<\/code><code>previous<\/code><code>next<\/code><code>onprevious<\/code><code>onnext<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- eventSimple.html --&gt;\n&lt;template&gt;\n  &lt;lightning-card title=\"EventSimple\" icon-name=\"custom:custom9\"&gt;\n    &lt;div class=\"slds-m-around_medium\"&gt;\n      &lt;p class=\"slds-m-vertical_medium content\"&gt;Page {page}&lt;\/p&gt;\n      &lt;c-paginator onprevious={previousHandler} onnext={nextHandler}&gt;&lt;\/c-paginator&gt;\n    &lt;\/div&gt;\n  &lt;\/lightning-card&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<p>\u5f53\u6536\u5230 \u548c \u4e8b\u4ef6\u65f6\uff0c\u5e76\u589e\u52a0\u548c\u51cf\u5c11\u9875\u7801\u3002<code>c-event-simple<\/code><code>previous<\/code><code>next<\/code><code>previousHandler<\/code><code>nextHandler<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ eventSimple.js\nimport { LightningElement } from \"lwc\";\n\nexport default class EventSimple extends LightningElement {\n  page = 1;\n\n  previousHandler() {\n    if (this.page &gt; 1) {\n      this.page = this.page - 1;\n    }\n  }\n\n  nextHandler() {\n    this.page = this.page + 1;\n  }\n}<\/code><\/pre>\n\n\n\n<p>\u63d0\u793a<\/p>\n\n\n\n<p>\u67e5\u770b\u00a0<code>github.com\/trailheadapps\/lwc-recipes<\/code>\u00a0\u5b58\u50a8\u5e93\u4e2d\u7684\u00a0<code>c-event-simple<\/code>\u00a0\u7ec4\u4ef6\u548c\u00a0<code>c-paginator<\/code>\u00a0\u7ec4\u4ef6\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5728\u4e8b\u4ef6\u4e2d\u4f20\u9012\u6570\u636e<\/h2>\n\n\n\n<p>\u82e5\u8981\u5c06\u6570\u636e\u4f20\u9012\u5230\u63a5\u6536\u7ec4\u4ef6\uff0c\u8bf7\u5728\u6784\u9020\u51fd\u6570\u4e2d\u8bbe\u7f6e\u5c5e\u6027\u3002\u63a5\u6536\u7ec4\u4ef6\u8bbf\u95ee\u4e8b\u4ef6\u4fa6\u542c\u5668\u7684\u5904\u7406\u7a0b\u5e8f\u51fd\u6570\u4e2d\u5c5e\u6027\u4e2d\u7684\u6570\u636e\u3002<code>detail<\/code><code>CustomEvent<\/code><code>detail<\/code><\/p>\n\n\n\n<p>\u6ce8\u610f<\/p>\n\n\n\n<p>\u8be5\u63a5\u53e3\u5bf9\u5c5e\u6027\u4e0d\u65bd\u52a0\u4efb\u4f55\u7c7b\u578b\u8981\u6c42\u6216\u7ed3\u6784\u3002\u4f46\u662f\uff0c\u4ec5\u53d1\u9001\u539f\u59cb\u6570\u636e\u5f88\u91cd\u8981\u3002JavaScript \u901a\u8fc7\u5f15\u7528\u4f20\u9012\u9664\u57fa\u5143\u4e4b\u5916\u7684\u6240\u6709\u6570\u636e\u7c7b\u578b\u3002\u5982\u679c\u7ec4\u4ef6\u5728\u5176\u5c5e\u6027\u4e2d\u5305\u542b\u5bf9\u8c61\uff0c\u5219\u4efb\u4f55\u4fa6\u542c\u5668\u90fd\u53ef\u4ee5\u5728\u7ec4\u4ef6\u4e0d\u77e5\u60c5\u7684\u60c5\u51b5\u4e0b\u66f4\u6539\u8be5\u5bf9\u8c61\u3002\u8fd9\u662f\u4e00\u4ef6\u574f\u4e8b\uff01\u6700\u4f73\u505a\u6cd5\u662f\u4ec5\u53d1\u9001\u57fa\u5143\uff0c\u6216\u8005\u5728\u5c06\u6570\u636e\u6dfb\u52a0\u5230\u5c5e\u6027\u4e4b\u524d\u5c06\u6570\u636e\u590d\u5236\u5230\u65b0\u5bf9\u8c61\u3002\u5c06\u6570\u636e\u590d\u5236\u5230\u65b0\u5bf9\u8c61\u53ef\u786e\u4fdd\u4ec5\u53d1\u9001\u6240\u9700\u7684\u6570\u636e\uff0c\u5e76\u4e14\u63a5\u6536\u65b9\u65e0\u6cd5\u66f4\u6539\u6570\u636e\u3002<code>CustomEvent<\/code><code>detail<\/code><code>detail<\/code><code>detail<\/code><\/p>\n\n\n\n<p>\u8ba9\u6211\u4eec\u770b\u4e00\u4e0b lwc-recipes \u5b58\u50a8\u5e93\u4e2d\u7684\u7ec4\u4ef6\u3002<code>c-event-with-data<\/code><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/developer.salesforce.com\/1\/content-asset\/immutable\/s\/17013859630000000\/salesforcedocslwc\/content\/media\/event_with_data.png\" alt=\"\u5177\u6709\u663e\u793a\u59d3\u540d\u3001\u804c\u52a1\u3001\u7535\u8bdd\u53f7\u7801\u548c\u7535\u5b50\u90ae\u4ef6\u5730\u5740\u7684\u9009\u5b9a\u8054\u7cfb\u4eba\u7684\u8054\u7cfb\u4eba\u5217\u8868\u3002\"\/><\/figure>\n\n\n\n<p>\u8054\u7cfb\u4eba\u5217\u8868\u4e2d\u7684\u6bcf\u4e2a\u9879\u76ee\u90fd\u662f\u4e00\u4e2a\u5d4c\u5957\u7ec4\u4ef6\u3002<code>c-contact-list-item<\/code><\/p>\n\n\n\n<p>\u8be5\u7ec4\u4ef6\u4f7f\u7528\u6267\u884c\u51fd\u6570\u7684\u4e8b\u4ef6\u4fa6\u542c\u5668\u5c06\u8054\u7cfb\u4eba\u59d3\u540d\u548c\u56fe\u7247\u5305\u88c5\u5728\u951a\u6807\u8bb0\u4e2d\u3002<code>c-contact-list-item<\/code><code>onclick<\/code><code>selectHandler<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- contactListItem.html --&gt;\n&lt;template&gt;\n    &lt;a href=\"#\" onclick={selectHandler}&gt;\n        &lt;lightning-layout vertical-align=\"center\"&gt;\n            &lt;lightning-layout-item&gt;\n                &lt;img src={contact.Picture__c}&gt;&lt;\/img&gt;\n            &lt;\/lightning-layout-item&gt;\n            &lt;lightning-layout-item padding=\"around-small\"&gt;\n                &lt;p&gt;{contact.Name}&lt;\/p&gt;\n            &lt;\/lightning-layout-item&gt;\n        &lt;\/lightning-layout&gt;\n    &lt;\/a&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<p>\u5f53\u7528\u6237\u5355\u51fb\u4ee5\u9009\u62e9\u8054\u7cfb\u4eba\u65f6\uff0c\u8be5\u7ec4\u4ef6\u5c06\u521b\u5efa\u5e76\u8c03\u5ea6\u88ab\u8c03\u7528\u7684 .\u8be5\u4e8b\u4ef6\u5305\u62ec\u6570\u636e\uff0c\u5373\u6240\u9009\u8054\u7cfb\u4eba\u7684 ID\u3002\u7236\u7ea7 \uff0c \u4f7f\u7528\u8054\u7cfb\u4eba\u5f15\u7528\u6765\u663e\u793a\u6709\u5173\u8054\u7cfb\u4eba\u7684\u8be6\u7ec6\u4fe1\u606f\u3002<code>CustomEvent<\/code><code>selected<\/code><code>detail: this.contact.Id<\/code><code>c-event-custom<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ contactListItem.js\nimport { LightningElement, api } from \"lwc\";\n\nexport default class ContactListItem extends LightningElement {\n  @api contact;\n\n  selectHandler(event) {\n    \/\/ Prevents the anchor element from navigating to a URL.\n    event.preventDefault();\n\n    \/\/ Creates the event with the contact ID data.\n    const selectedEvent = new CustomEvent(\"selected\", { detail: this.contact.Id });\n\n    \/\/ Dispatches the event.\n    this.dispatchEvent(selectedEvent);\n  }\n}<\/code><\/pre>\n\n\n\n<p>\u8be5\u7ec4\u4ef6\u4fa6\u542c\u5c5e\u6027\u4e2d\u7684\u4e8b\u4ef6\uff0c\u5e76\u5728\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u4e2d\u5904\u7406\u8be5\u4e8b\u4ef6\u3002<code>c-event-with-data<\/code><code>selected<\/code><code>onselected<\/code><code>contactSelected<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- eventWithData.html --&gt;\n&lt;template&gt;\n    &lt;lightning-card title=\"EventWithData\" icon-name=\"custom:custom9\"&gt;\n        &lt;lightning-layout class=\"slds-m-around_medium\"&gt;\n            &lt;lightning-layout-item&gt;\n                &lt;template lwc:if={listIsNotEmpty}&gt;\n                    &lt;template for:each={contacts.data} for:item=\"contact\"&gt;\n                        &lt;c-contact-list-item key={contact.Id} contact={contact} onselected={contactSelected}&gt;&lt;\/c-contact-list-item&gt;\n                    &lt;\/template&gt;\n                &lt;\/template&gt;\n            &lt;\/lightning-layout-item&gt;\n            &lt;lightning-layout-item class=\"slds-m-left_medium\"&gt;\n                &lt;template lwc:if={selectedContact}&gt;\n                    &lt;img src={selectedContact.Picture__c}&gt;&lt;\/img&gt;\n                    &lt;p&gt;{selectedContact.Name}&lt;\/p&gt;\n                    &lt;p&gt;{selectedContact.Title}&lt;\/p&gt;\n                    &lt;p&gt;&lt;lightning-formatted-phone value={selectedContact.Phone}&gt;&lt;\/lightning-formatted-phone&gt;&lt;\/p&gt;\n                    &lt;p&gt;&lt;lightning-formatted-email value={selectedContact.Email}&gt;&lt;\/lightning-formatted-email&gt;&lt;\/p&gt;\n                &lt;\/template&gt;\n            &lt;\/lightning-layout-item&gt;\n        &lt;\/lightning-layout&gt;\n    &lt;\/lightning-card&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<p>\u5728\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u4e2d\uff0c\u7ec4\u4ef6\u5c06\u5c5e\u6027\u5206\u914d\u7ed9\u5c5e\u6027\u3002\u5b83\u5728\u901a\u8fc7 \u7f6e\u5907\u7684\u9635\u5217\u4e2d\u67e5\u627e\u5177\u6709\u8be5 ID \u7684\u8054\u7cfb\u4eba\uff0c\u5e76\u5728\u6a21\u677f\u4e2d\u663e\u793a\u8054\u7cfb\u4eba\u7684\u59d3\u540d\u3001\u804c\u52a1\u3001\u7535\u8bdd\u548c\u7535\u5b50\u90ae\u4ef6\u3002<code>contactSelected<\/code><code>event.detail<\/code><code>contactId<\/code><code>contacts<\/code><code>@wire<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ eventWithData.js\nimport { LightningElement, wire } from \"lwc\";\nimport getContactList from \"@salesforce\/apex\/ContactController.getContactList\";\n\nexport default class EventWithData extends LightningElement {\n  selectedContact;\n\n  @wire(getContactList) contacts;\n\n  contactSelected(event) {\n    const contactId = event.detail;\n    this.selectedContact = this.contacts.data.find((contact) =&gt; contact.Id === contactId);\n  }\n\n  get listIsNotEmpty() {\n    return this.contacts &amp;&amp; Array.isArray(this.contacts.data) &amp;&amp; this.contacts.data.length &gt; 0;\n  }\n}<\/code><\/pre>\n\n\n\n<p>\u63d0\u793a<\/p>\n\n\n\n<p>\u67e5\u770b\u00a0github.com\/trailheadapps\/lwc-recipes\u00a0\u5b58\u50a8\u5e93\u4e2d\u7684\u00a0<code>c-event-with-data<\/code>\u00a0\u7ec4\u4ef6\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"handle-events\">\u5904\u7406\u4e8b\u4ef6<\/h2>\n\n\n\n<p>\u6709\u4e24\u79cd\u65b9\u6cd5\u53ef\u4ee5\u4fa6\u542c\u4e8b\u4ef6\uff1a\u4ece\u7ec4\u4ef6\u7684 HTML \u6a21\u677f\u4ee5\u58f0\u660e\u65b9\u5f0f\u4fa6\u542c\u4e8b\u4ef6\uff0c\u6216\u8005\u4f7f\u7528\u547d\u4ee4\u5f0f JavaScript API \u4ee5\u7f16\u7a0b\u65b9\u5f0f\u4fa6\u542c\u4e8b\u4ef6\u3002\u6700\u597d\u4ece HTML \u6a21\u677f\u4e2d\u76d1\u542c\uff0c\u56e0\u4e3a\u5b83\u51cf\u5c11\u4e86\u60a8\u5fc5\u987b\u7f16\u5199\u7684\u4ee3\u7801\u91cf\u3002\u82e5\u8981\u5904\u7406\u4e8b\u4ef6\uff0c\u8bf7\u5728\u7ec4\u4ef6\u7684 JavaScript \u7c7b\u4e2d\u5b9a\u4e49\u65b9\u6cd5\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4ee5\u58f0\u660e\u65b9\u5f0f\u9644\u52a0\u4e8b\u4ef6\u4fa6\u542c\u5668<\/h2>\n\n\n\n<p>\u5728\u6240\u6709\u8005\u7ec4\u4ef6\u7684\u6a21\u677f\u4e2d\u4ee5\u6807\u8bb0\u5f62\u5f0f\u58f0\u660e\u4fa6\u542c\u5668\uff0c\u5728\u672c\u4f8b\u4e2d\u4e3a .<code>c-parent<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- parent.html --&gt;\n&lt;template&gt;\n  &lt;c-child onnotification={handleNotification}&gt;&lt;\/c-child&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<p>\u5728\u6b64\u793a\u4f8b\u4e2d\uff0c\u5728 JavaScript \u6587\u4ef6\u4e2d\u5b9a\u4e49\u5904\u7406\u7a0b\u5e8f\u51fd\u6570\u3002<code>handleNotification<\/code><code>c-parent<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ parent.js\nimport { LightningElement } from \"lwc\";\nexport default class Parent extends LightningElement {\n  handleNotification() {\n    \/\/ Code runs when event is received\n  }\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u4ee5\u7f16\u7a0b\u65b9\u5f0f\u9644\u52a0\u4e8b\u4ef6\u4fa6\u542c\u5668<\/h2>\n\n\n\n<p>\u5728 JavaScript \u4e2d\u5b9a\u4e49\u4fa6\u542c\u5668\u548c\u5904\u7406\u7a0b\u5e8f\u51fd\u6570\u3002<code>c-parent<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ parent.js\nimport { LightningElement } from \"lwc\";\nexport default class Parent extends LightningElement {\n  constructor() {\n    super();\n    this.template.addEventListener(\"notification\", this.handleNotification);\n  }\n  handleNotification = () =&gt; {};\n}<\/code><\/pre>\n\n\n\n<p>\u5982\u679c\u5c06\u540c\u4e00\u4fa6\u542c\u5668\u91cd\u590d\u6dfb\u52a0\u5230\u540c\u4e00\u5143\u7d20\u4e2d\uff0c\u5219\u6d4f\u89c8\u5668\u5c06\u5ffd\u7565\u91cd\u590d\u9879\u3002<\/p>\n\n\n\n<p>\u5982\u679c\u672a\u5220\u9664\u4e8b\u4ef6\u4fa6\u542c\u5668\uff0c\u5219\u53ef\u4ee5\u9009\u62e9\u5728\u8c03\u7528\u4e2d\u5185\u8054\u4ee3\u7801\u3002<code>handleNotification<\/code><code>addEventListener()<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>this.template.addEventListener(\"notification\", (evt) =&gt; {\n  console.log(\"Notification event\", evt);\n});<\/code><\/pre>\n\n\n\n<p>\u91cd\u8981<\/p>\n\n\n\n<p>\u4e0d\u8981\u4f7f\u7528 .\u8fd9\u662f\u4e00\u4e2a\u53cd\u6a21\u5f0f\uff0c\u56e0\u4e3a\u8fd4\u56de\u4e00\u4e2a\u65b0\u51fd\u6570\uff0c\u56e0\u6b64\u7ec4\u4ef6\u4e0d\u80fd\u4f7f\u7528\u76f8\u540c\u7684\u51fd\u6570\u5b9e\u4f8b\u8fdb\u884c\u8c03\u7528\u3002\u7531\u4e8e\u7ec4\u4ef6\u4e0d\u80fd\u4f7f\u7528\u76f8\u540c\u7684\u51fd\u6570\u5b9e\u4f8b\uff0c\u56e0\u6b64\u4fa6\u542c\u5668\u4f1a\u9020\u6210\u5185\u5b58\u6cc4\u6f0f\u3002<code>addEventListener({eventName}, this.handleNotification.bind(this))<\/code><code>bind()<\/code><code>removeEventListener()<\/code><\/p>\n\n\n\n<p>\u6dfb\u52a0\u4e8b\u4ef6\u4fa6\u542c\u5668\u6709\u4e24\u79cd\u8bed\u6cd5\u3002\u4e00\u4e2a\u7528\u4e8e\u5c06\u4e8b\u4ef6\u4fa6\u542c\u5668\u6dfb\u52a0\u5230\u7ec4\u4ef6\u7684\u5f71\u5b50\u8fb9\u754c\u5185\u7684\u5143\u7d20\uff0c\u53e6\u4e00\u4e2a\u7528\u4e8e\u5c06\u4e8b\u4ef6\u4fa6\u542c\u5668\u6dfb\u52a0\u5230\u6a21\u677f\u4e0d\u62e5\u6709\u7684\u5143\u7d20\uff0c\u4f8b\u5982\uff0c\u4f20\u9012\u5230\u69fd\u4e2d\u7684\u5143\u7d20\u3002<\/p>\n\n\n\n<p>\u8981\u5c06\u4e8b\u4ef6\u4fa6\u542c\u5668\u6dfb\u52a0\u5230\u9634\u5f71\u8fb9\u754c\u5185\u7684\u5143\u7d20\uff0c\u8bf7\u4f7f\u7528 .<code>template<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>this.template.addEventListener();<\/code><\/pre>\n\n\n\n<p>\u82e5\u8981\u5c06\u4e8b\u4ef6\u4fa6\u542c\u5668\u6dfb\u52a0\u5230\u6a21\u677f\u4e0d\u62e5\u6709\u7684\u5143\u7d20\uff0c\u8bf7\u76f4\u63a5\u8c03\u7528\u3002<code>addEventListener<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>this.addEventListener();<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u83b7\u53d6\u5bf9\u8c03\u5ea6\u4e8b\u4ef6\u7684\u7ec4\u4ef6\u7684\u5f15\u7528<\/h2>\n\n\n\n<p>\u82e5\u8981\u83b7\u53d6\u5bf9\u8c03\u5ea6\u4e8b\u4ef6\u7684\u5bf9\u8c61\u7684\u5f15\u7528\uff0c\u8bf7\u4f7f\u7528\u00a0<code>Event.target<\/code>\u00a0\u5c5e\u6027\uff0c\u8be5\u5c5e\u6027\u662f\u4e8b\u4ef6\u7684 DOM API \u7684\u4e00\u90e8\u5206\u3002<\/p>\n\n\n\n<p>\u63d0\u793a<\/p>\n\n\n\n<p>lwc-recipes\u00a0repo \u4e2d\u7684\u51e0\u4e2a\u914d\u65b9\u4f7f\u7528 .\u82e5\u8981\u67e5\u627e\u793a\u4f8b\uff0c\u8bf7\u5728\u5b58\u50a8\u5e93\u4e2d\u641c\u7d22 .<code>Event.targetEvent.target<\/code><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8b\u4ef6\u91cd\u5b9a\u5411<\/h2>\n\n\n\n<p>\u5f53\u4e8b\u4ef6\u5192\u6ce1 DOM \u65f6\uff0c\u5982\u679c\u5b83\u8d8a\u8fc7\u9634\u5f71\u8fb9\u754c\uff0c\u5219 \u7684\u503c\u4f1a\u66f4\u6539\u4ee5\u5339\u914d\u4fa6\u542c\u5668\u7684\u8303\u56f4\u3002\u6b64\u66f4\u6539\u79f0\u4e3a\u201c\u4e8b\u4ef6\u91cd\u5b9a\u5411\u201d\u3002\u4e8b\u4ef6\u88ab\u91cd\u65b0\u5b9a\u4f4d\uff0c\u56e0\u6b64\u4fa6\u542c\u5668\u65e0\u6cd5\u770b\u5230\u8c03\u5ea6\u4e8b\u4ef6\u7684\u7ec4\u4ef6\u7684\u5f71\u5b50 DOM\u3002\u4e8b\u4ef6\u91cd\u5b9a\u5411\u4fdd\u7559\u4e86\u5f71\u5b50 DOM \u5c01\u88c5\u3002<code>Event.target<\/code><\/p>\n\n\n\n<p>\u8ba9\u6211\u4eec\u770b\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- myButton.html --&gt;\n&lt;template&gt;\n  &lt;button&gt;{label}&lt;\/button&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<p>\u5355\u51fb\u4fa6\u542c\u5668\u59cb\u7ec8\u63a5\u6536\u4f5c\u4e3a\u76ee\u6807\uff0c\u5373\u4f7f\u5355\u51fb\u53d1\u751f\u5728\u5143\u7d20\u4e0a\u4e5f\u662f\u5982\u6b64\u3002<code>&lt;my-button&gt;<\/code><code>my-button<\/code><code>button<\/code><\/p>\n\n\n\n<p>\u60f3\u8c61\u4e00\u4e0b\uff0c\u4e00\u4e2a\u4e8b\u4ef6\u662f\u4ece\u7ec4\u4ef6\u4e2d\u7684\u5143\u7d20\u8c03\u5ea6\u51fa\u6765\u7684\u3002\u5728\u7ec4\u4ef6\u7684\u5f71\u5b50 DOM \u4e2d\uff0c\u662f .\u4f46\u662f\u5bf9\u4e8e\u5305\u542b\u7ec4\u4ef6\u4e2d\u5143\u7d20\u7684\u4fa6\u542c\u5668\u6765\u8bf4\uff0c\u662f \uff0c\u56e0\u4e3a\u8be5\u5143\u7d20\u65e0\u6cd5\u770b\u5230\u5f71\u5b50 DOM\u3002<code>div<\/code><code>c-todo-item<\/code><code>Event.target<\/code><code>div<\/code><code>p<\/code><code>c-todo-app<\/code><code>Event.target<\/code><code>c-todo-item<\/code><code>p<\/code><code>c-todo-item<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;c-todo-app&gt;\n  #shadow-root\n  &lt;div&gt;\n    &lt;p&gt;Your To Do List&lt;\/p&gt;\n  &lt;\/div&gt;\n  &lt;c-todo-item&gt;\n    #shadow-root\n    &lt;div&gt;\n      &lt;p&gt;Go to the store&lt;\/p&gt;\n    &lt;\/div&gt;\n  &lt;\/c-todo-item&gt;\n&lt;\/c-todo-app&gt;<\/code><\/pre>\n\n\n\n<p>\u6709\u8da3\u7684\u662f\uff0c\u5bf9\u4e8e \u4e0a\u7684\u4fa6\u542c\u5668\u6765\u8bf4\uff0c\u662f \uff0c\u800c\u4e0d\u662f \uff0c\u56e0\u4e3a \u5728\u9634\u5f71\u8fb9\u754c\u4e4b\u5916\u3002<code>c-todo-item<\/code><code>Event.target<\/code><code>c-todo-item<\/code><code>div<\/code><code>c-todo-item<\/code><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4fa6\u542c\u8f93\u5165\u5b57\u6bb5\u7684\u66f4\u6539<\/h2>\n\n\n\n<p>\u82e5\u8981\u4fa6\u542c\u6a21\u677f\u4e2d\u63a5\u53d7\u8f93\u5165\u7684\u5143\u7d20\uff08\u5982\u6587\u672c\u5b57\u6bb5 \uff08 \u6216 \uff09\uff09\u7684\u66f4\u6539\uff0c\u8bf7\u4f7f\u7528\u8be5\u4e8b\u4ef6\u3002<code>&lt;input&gt;<\/code><code>&lt;lightning-input&gt;<\/code><code>onchange<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- form.html --&gt;\n&lt;template&gt;\n  &lt;input type=\"text\" value={myValue} onchange={handleChange} \/&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ form.js\nimport { LightningElement } from \"lwc\";\nexport default class Form extends LightningElement {\n  myValue = \"initial value\";\n\n  handleChange(evt) {\n    console.log(\"Current value of the input: \" + evt.target.value);\n  }\n}<\/code><\/pre>\n\n\n\n<p>\u5728\u6b64\u793a\u4f8b\u4e2d\uff0c\u6bcf\u6b21\u8f93\u5165\u503c\u66f4\u6539\u65f6\u90fd\u4f1a\u8c03\u7528 JavaScript \u6587\u4ef6\u4e2d\u7684\u65b9\u6cd5\u3002<code>handleChange()<\/code><\/p>\n\n\n\n<p>\u8be5\u5c5e\u6027\u8868\u793a\u8f93\u5165\u5143\u7d20\u7684\u503c\u3002\u6b64<em>\u5c5e\u6027<\/em>\u503c\u4e0d\u4f1a\u5728\u6bcf\u6b21\u66f4\u6539\u65f6\u81ea\u52a8\u66f4\u65b0\u3002<code>myValue<\/code><\/p>\n\n\n\n<p>\u60a8\u53ef\u80fd\u9700\u8981\u5bf9\u7528\u6237\u8f93\u5165\u7684\u503c\u8fdb\u884c\u989d\u5916\u9a8c\u8bc1\uff0c\u4ee5\u4fbf\u5728\u7528\u6237\u952e\u5165\u65f6\u81ea\u52a8\u66f4\u6b63\u6216\u9650\u5236\u67d0\u4e9b\u503c\u3002\u82e5\u8981\u4e0e\u8f93\u5165\u7684\u5f53\u524d\u503c\u4fdd\u6301\u540c\u6b65\uff0c\u8bf7\u5728\u65b9\u6cd5\u4e2d\u66f4\u65b0\u3002\u4ee5\u4e0b\u4ee3\u7801\u901a\u8fc7\u5220\u9664\u5b57\u7b26\u4e32\u5f00\u5934\u548c\u7ed3\u5c3e\u7684\u7a7a\u683c\u6765\u81ea\u52a8\u66f4\u6b63\u952e\u5165\u7684\u503c\u3002\u7528\u4e8e\u83b7\u53d6\u8f93\u5165\u5b57\u6bb5\u7684\u5f53\u524d\u503c\u3002<code>myValue<\/code><code>myValue<\/code><code>handleChange()<\/code><code>evt.target.value<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ form.js\nimport { LightningElement } from \"lwc\";\nexport default class Form extends LightningElement {\n  myValue = \"initial value\";\n\n  handleChange(evt) {\n    const typedValue = evt.target.value;\n    const trimmedValue = typedValue.trim(); \/\/ trims the value entered by the user\n    if (typedValue !== trimmedValue) {\n      evt.target.value = trimmedValue;\n    }\n    this.myValue = trimmedValue; \/\/ updates the internal state\n  }\n}<\/code><\/pre>\n\n\n\n<p>\u6b64\u793a\u4f8b\u6f14\u793a\u5982\u4f55\u5c06 input value \u5c5e\u6027\u91cd\u7f6e\u4e3a\u884c \u4e2d\u7684\u4fee\u526a\u503c\u3002\u5b83\u8fd8\u6f14\u793a\u4e86\u5982\u4f55\u4f7f\u5c5e\u6027\u4e0e\u89c4\u8303\u5316\u503c\u4fdd\u6301\u540c\u6b65\uff0c\u4ee5\u9632\u7ec4\u4ef6\u5c06\u6765\u88ab\u91cd\u65b0\u51bb\u7ed3\uff08\u52a0\u8f7d\u65b0\u503c\uff09\u3002<code>evt.target.value = trimmedValue<\/code><code>myValue<\/code><\/p>\n\n\n\n<p>\u6ce8\u610f<\/p>\n\n\n\n<p>\u4ece\u901a\u8fc7\u6a21\u677f\u5b9a\u4e49\u7684\u5143\u7d20\u4e2d\u66f4\u6539\u5c5e\u6027\u53ef\u80fd\u4f1a\u5728\u7ec4\u4ef6\u4e2d\u7684\u5176\u4ed6\u4f4d\u7f6e\u4ea7\u751f\u4e0d\u5e0c\u671b\u7684\u526f\u4f5c\u7528\u3002\u5728\u6211\u4eec\u7684\u793a\u4f8b\u4e2d\uff0c\u5143\u7d20\u7684\u8f93\u5165\u503c\u5c5e\u6027\u4ece\u6a21\u677f\u4e2d\u5b9a\u4e49\u7684\u503c\u66f4\u6539\u4e3a \u3002\u8be5\u793a\u4f8b\u66f4\u6539\u6a21\u677f \uff08\uff09 \u4e2d\u4f7f\u7528\u7684\u503c\uff0c\u4ee5\u4f7f\u7ec4\u4ef6\u5143\u7d20\u7684\u72b6\u6001\u4fdd\u6301\u540c\u6b65\u3002\u5426\u5219\uff0c\u6a21\u677f\u89e3\u9664\u51bb\u7ed3\u4f1a\u5728\u5c1d\u8bd5\u5c06\u8f93\u5165\u5143\u7d20\u7684\u72b6\u6001\u4e0e\u7ec4\u4ef6\u7684\u72b6\u6001\u8fdb\u884c\u534f\u8c03\u65f6\u68c0\u6d4b\u5230\u5c5e\u6027\u503c\u4e0d\u5339\u914d\u3002\u8fd9\u79cd\u4e0d\u5339\u914d\u4f1a\u751f\u6210\u8fd0\u884c\u65f6\u8b66\u544a\uff0c\u60a8\u9700\u8981\u8c03\u6574\u7ec4\u4ef6\u6216 JavaScript\uff0c\u4ee5\u4fdd\u6301\u6574\u4e2a\u6a21\u677f\u4e2d\u6570\u636e\u7684\u5b8c\u6574\u6027\u3002<code>evt.target<\/code><code>myValue<\/code><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5220\u9664\u4e8b\u4ef6\u4fa6\u542c\u5668<\/h2>\n\n\n\n<p>\u4f5c\u4e3a\u7ec4\u4ef6\u751f\u547d\u5468\u671f\u7684\u4e00\u90e8\u5206\uff0c\u8be5\u6846\u67b6\u8d1f\u8d23\u4e3a\u60a8\u7ba1\u7406\u548c\u6e05\u7406\u4fa6\u542c\u5668\u3002\u4f46\u662f\uff0c\u5982\u679c\u60a8\u5c06\u4fa6\u542c\u5668\u6dfb\u52a0\u5230\u5176\u4ed6\u4efb\u4f55\u5185\u5bb9\uff08\u5982\u5bf9\u8c61\u3001\u5bf9\u8c61\u7b49\uff09\uff0c\u5219\u60a8\u6709\u8d23\u4efb\u81ea\u884c\u5220\u9664\u4fa6\u542c\u5668\u3002<code>window<\/code><code>document<\/code><\/p>\n\n\n\n<p>\u8981\u5220\u9664\u4e8b\u4ef6\u4fa6\u542c\u5668\uff0c\u8bf7\u4f7f\u7528\u00a0<code>disconnectedCallback<\/code>\u00a0\u751f\u547d\u5468\u671f\u6302\u94a9\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"configure-event-propagation\">\u914d\u7f6e\u4e8b\u4ef6\u4f20\u64ad<\/h2>\n\n\n\n<p>\u89e6\u53d1\u4e8b\u4ef6\u540e\uff0c\u5b83\u53ef\u4ee5\u901a\u8fc7 DOM \u5411\u4e0a\u4f20\u64ad\u3002\u82e5\u8981\u4e86\u89e3\u4e8b\u4ef6\u7684\u5904\u7406\u4f4d\u7f6e\uff0c\u8bf7\u4e86\u89e3\u4e8b\u4ef6\u7684\u4f20\u64ad\u65b9\u5f0f\u3002<\/p>\n\n\n\n<p>\u4e8b\u4ef6\u901a\u8fc7 DOM \u5192\u6ce1;\u8fd9\u5c31\u662f\u5b69\u5b50\u548c\u7236\u6bcd\u7684\u6c9f\u901a\u65b9\u5f0f\u2014\u2014\u5411\u4e0b\u652f\u6491\uff0c\u5411\u4e0a\u4e8b\u4ef6\u3002\u5f53\u4e8b\u4ef6\u5192\u6ce1\u65f6\uff0c\u5b83\u5c06\u6210\u4e3a\u7ec4\u4ef6 API \u7684\u4e00\u90e8\u5206\uff0c\u4e8b\u4ef6\u8def\u5f84\u4e0a\u7684\u6bcf\u4e2a\u4f7f\u7528\u8005\u90fd\u5fc5\u987b\u4e86\u89e3\u8be5\u4e8b\u4ef6\u3002\u4e86\u89e3\u5192\u6ce1\u7684\u5de5\u4f5c\u539f\u7406\u975e\u5e38\u91cd\u8981\uff0c\u8fd9\u6837\u60a8\u5c31\u53ef\u4ee5\u9009\u62e9\u9002\u7528\u4e8e\u60a8\u7684\u7ec4\u4ef6\u7684\u6700\u5177\u9650\u5236\u6027\u7684\u5192\u6ce1\u914d\u7f6e\u3002<\/p>\n\n\n\n<p>Lightning Web \u7ec4\u4ef6\u4e8b\u4ef6\u7684\u4f20\u64ad\u89c4\u5219\u4e0e DOM \u4e8b\u4ef6\u76f8\u540c\u3002Lightning Web \u7ec4\u4ef6\u4ec5\u4f7f\u7528\u5192\u6ce1\u9636\u6bb5\u3002\u4e0d\u652f\u6301\u8c03\u5ea6\u4e8b\u4ef6\u6216\u5c06\u4fa6\u542c\u5668\u6dfb\u52a0\u5230\u6355\u83b7\u9636\u6bb5\u3002\u7b80\u5355\u5730\u5c06\u4e8b\u4ef6\u7684\u8def\u5f84\u89c6\u4e3a\u4ece\u7ec4\u4ef6\u5f00\u59cb\uff0c\u7136\u540e\u79fb\u52a8\u5230\u5176\u7236\u7ec4\u4ef6\uff0c\u7136\u540e\u662f\u7956\u7236\u7ea7\uff0c\u4f9d\u6b64\u7c7b\u63a8\u3002<\/p>\n\n\n\n<p>\u4e8b\u4ef6\u76ee\u6807\u4e0d\u4f1a\u4f20\u64ad\u5230\u7ec4\u4ef6\u5b9e\u4f8b\u7684\u5f71\u5b50\u6839\u4e4b\u5916\u3002\u5728\u7ec4\u4ef6\u5916\u90e8\uff0c\u6240\u6709\u4e8b\u4ef6\u76ee\u6807\u90fd\u662f\u7ec4\u4ef6\u672c\u8eab\u3002\u4f46\u662f\uff0c\u5728\u5f71\u5b50\u6811\u4e2d\uff0c\u60a8\u53ef\u4ee5\u5904\u7406\u6765\u81ea\u6811\u4e2d\u7279\u5b9a\u76ee\u6807\u7684\u4e8b\u4ef6\u3002\u6839\u636e\u4e8b\u4ef6\u7684\u4fa6\u542c\u5668\u9644\u52a0\u4f4d\u7f6e\u4ee5\u53ca\u4e8b\u4ef6\u53d1\u751f\u7684\u4f4d\u7f6e\uff0c\u53ef\u4ee5\u5177\u6709\u4e0d\u540c\u7684\u76ee\u6807\u3002<\/p>\n\n\n\n<p>\u6ce8\u610f<\/p>\n\n\n\n<p>\u6b64\u5185\u5bb9\u6539\u7f16\u81ea Salesforce \u5f00\u53d1\u4eba\u5458\u535a\u5ba2\u6587\u7ae0\u00a0<strong>Lightning Web \u7ec4\u4ef6\u4e2d\u7684\u4e8b\u4ef6\u5982\u4f55\u5192\u6ce1<\/strong>\u3002<\/p>\n\n\n\n<p>\u521b\u5efa\u4e8b\u4ef6\u65f6\uff0c\u8bf7\u4f7f\u7528\u4e8b\u4ef6\u7684\u4e24\u4e2a\u5c5e\u6027\u548c \u5b9a\u4e49\u4e8b\u4ef6\u4f20\u64ad\u884c\u4e3a\u3002<code>bubbles<\/code><code>composed<\/code><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>Event.bubbles<\/code>\u4e00\u4e2a Boolean \u503c\uff0c\u8be5\u503c\u6307\u793a\u4e8b\u4ef6\u662f\u5426\u901a\u8fc7 DOM \u5192\u6ce1\u3002\u7f3a\u7701\u503c\u4e3a .<code>false<\/code><\/li>\n\n\n\n<li><code>Event.composed<\/code>\u4e00\u4e2a Boolean \u503c\uff0c\u8be5\u503c\u6307\u793a\u4e8b\u4ef6\u662f\u5426\u53ef\u4ee5\u7a7f\u8fc7\u9634\u5f71\u8fb9\u754c\u3002\u7f3a\u7701\u503c\u4e3a .<code>false<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u82e5\u8981\u83b7\u53d6\u6709\u5173\u4e8b\u4ef6\u7684\u4fe1\u606f\uff0c\u8bf7\u4f7f\u7528\u4e8b\u4ef6\u00a0Web API \u7684\u8fd9\u4e9b\u5c5e\u6027\u548c\u65b9\u6cd5\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>Event.target<\/code>\u8c03\u5ea6\u4e8b\u4ef6\u7684\u5143\u7d20\u3002\u6bcf\u4e2a\u7ec4\u4ef6\u7684\u5185\u90e8 DOM \u90fd\u5c01\u88c5\u5728\u4e00\u4e2a\u5f71\u5b50 DOM\u00a0\u4e2d\u3002\u9634\u5f71\u8fb9\u754c\u662f\u5e38\u89c4 DOM\uff08\u4e5f\u79f0\u4e3a\u8f7b\u91cf\u7ea7 DOM\uff09\u548c\u9634\u5f71 DOM \u4e4b\u95f4\u7684\u7ebf\u3002\u5982\u679c\u4e8b\u4ef6\u5192\u6ce1\u5e76\u8d8a\u8fc7\u9634\u5f71\u8fb9\u754c\uff0c\u5219 value of \u7684\u503c\u5c06\u66f4\u6539\u4e3a\u8868\u793a\u4e0e\u4fa6\u542c\u5668\u4f4d\u4e8e\u540c\u4e00\u4f5c\u7528\u57df\u4e2d\u7684\u5143\u7d20\u3002\u4e8b\u4ef6\u91cd\u5b9a\u5411\u53ef\u4fdd\u7559\u7ec4\u4ef6\u5c01\u88c5\uff0c\u5e76\u9632\u6b62\u66b4\u9732\u7ec4\u4ef6\u7684\u5185\u90e8\u3002<code>Event.target<\/code>\u4f8b\u5982\uff0c\u5355\u51fb\u4fa6\u542c\u5668\u59cb\u7ec8\u63a5\u6536\u4f5c\u4e3a\u76ee\u6807\uff0c\u5373\u4f7f\u5355\u51fb\u53d1\u751f\u5728\u5143\u7d20\u4e0a\u4e5f\u662f\u5982\u6b64\u3002<code>&lt;my-button>my-buttonbutton&lt;!-- myButton.html --> &lt;template> &lt;button>{label}&lt;\/button> &lt;\/template><\/code><\/li>\n\n\n\n<li><code>Event.currentTarget<\/code>\u5f53\u4e8b\u4ef6\u904d\u5386 DOM \u65f6\uff0c\u6b64\u5c5e\u6027\u59cb\u7ec8\u5f15\u7528\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u9644\u52a0\u5230\u7684\u5143\u7d20\u3002<\/li>\n\n\n\n<li><code>Event.composedPath()<\/code>\u5f53\u4e8b\u4ef6\u904d\u5386 DOM \u65f6\uff0c\u5c06\u5728\u5176\u4e0a\u8c03\u7528\u4fa6\u542c\u5668\u7684\u4e8b\u4ef6\u76ee\u6807\u7684\u6570\u7ec4\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u9759\u6001\u6210\u5206<\/h2>\n\n\n\n<p>\u9759\u6001\u5408\u6210\u4e0d\u4f7f\u7528\u63d2\u69fd\u3002\u5728\u8fd9\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\u4e2d\uff0ccompose \uff0c\u800c compose \u3002<code>c-app<\/code><code>c-parent<\/code><code>c-child<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;c-app onbuttonclick={handleButtonClick}&gt;&lt;\/c-app&gt;<\/code><\/pre>\n\n\n\n<p>\u5e94\u7528\u7a0b\u5e8f\u4e2d\u7684\u7236\u7ec4\u4ef6\u5904\u7406\u6309\u94ae\u5355\u51fb\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- app.html --&gt;\n&lt;template&gt;\n  &lt;h2&gt;My app&lt;\/h2&gt;\n  &lt;c-parent onbuttonclick={handleButtonClick}&gt;&lt;\/c-parent&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<p>\u7236\u7ec4\u4ef6\u5305\u542b\u4e00\u4e2a\u5e26\u6709\u5b50\u7ec4\u4ef6\u7684\u5305\u88c5\u5668\uff0c\u8fd9\u4e24\u4e2a\u7ec4\u4ef6\u90fd\u4fa6\u542c\u6309\u94ae\u5355\u51fb\u4e8b\u4ef6\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- parent.html --&gt;\n&lt;template&gt;\n  &lt;h3&gt;I'm a parent component&lt;\/h3&gt;\n  &lt;div class=\"wrapper\" onbuttonclick={handleButtonClick}&gt;\n    &lt;c-child onbuttonclick={handleButtonClick}&gt;&lt;\/c-child&gt;\n  &lt;\/div&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<p>\u5b50\u7ec4\u4ef6\u5305\u542b\u5e26\u6709\u5904\u7406\u7a0b\u5e8f\u7684\u6309\u94ae\u3002<code>onclick<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- child.html --&gt;\n&lt;template&gt;\n  &lt;h3&gt;I'm a child component&lt;\/h3&gt;\n  &lt;button onclick={handleClick}&gt;click me&lt;\/button&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ child.js\nhandleClick() {\n    const buttonclicked = new CustomEvent('buttonclick', {\n        \/\/event options\n    });\n    this.dispatchEvent(buttonclicked);\n}<\/code><\/pre>\n\n\n\n<p>\u8be5\u793a\u4f8b\u4ece\u5355\u51fb\u6309\u94ae\u65f6\u89e6\u53d1\u4e8b\u4ef6 \u3002\u4e8b\u4ef6\u4fa6\u542c\u5668\u4e3a\u4ee5\u4e0b\u5143\u7d20\u4e0a\u7684\u81ea\u5b9a\u4e49\u4e8b\u4ef6\u9644\u52a0\uff1a<code>buttonclick<\/code><code>c-child<\/code><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>body<\/code><\/li>\n\n\n\n<li><code>c-app<\/code>\u4e3b\u673a<\/li>\n\n\n\n<li><code>c-parent<\/code><\/li>\n\n\n\n<li><code>div.wrapper<\/code><\/li>\n\n\n\n<li><code>c-child<\/code>\u4e3b\u673a<\/li>\n<\/ul>\n\n\n\n<p>\u6241\u5e73\u5316\u7684\u6811\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;body&gt;\n  &lt;!-- Listening for buttonclick event --&gt;\n  &lt;c-app&gt;\n    &lt;!-- Listening for buttonclick event --&gt;\n    #shadow-root\n    |  &lt;h2&gt;My app&lt;\/h2&gt;\n    |  &lt;c-parent&gt;\n    |    &lt;!-- Listening for buttonclick event --&gt;\n    |    #shadow-root\n    |    |  &lt;h3&gt;I'm a parent component&lt;\/h3&gt;\n    |    |  &lt;div class=\"wrapper\"&gt;\n    |    |     &lt;!-- Listening for buttonclick event --&gt;\n    |    |     &lt;c-child&gt;\n    |    |      #shadow-root \n    |    |      |  &lt;!-- Listening for buttonclick event --&gt;\n    |    |      |  &lt;h3&gt;I'm a child component&lt;\/h3&gt;\n    |    |      |  &lt;button&gt;click me&lt;\/button&gt;\n    |    |      &lt;\/c-child&gt;\n    |    |    &lt;\/div&gt;\n    |  &lt;\/c-parent&gt;\n  &lt;\/c-app&gt;\n&lt;\/body&gt;<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u6c14\u6ce1\uff1a\u5047\uff0c\u7ec4\u5408\uff1a\u5047<\/h2>\n\n\n\n<p>\u9ed8\u8ba4\u914d\u7f6e\u3002\u8be5\u4e8b\u4ef6\u4e0d\u4f1a\u901a\u8fc7 DOM \u5192\u6ce1\uff0c\u4e5f\u4e0d\u4f1a\u8d8a\u8fc7\u9634\u5f71\u8fb9\u754c\u3002\u4fa6\u542c\u6b64\u4e8b\u4ef6\u7684\u552f\u4e00\u65b9\u6cd5\u662f\u76f4\u63a5\u5728\u8c03\u5ea6\u4e8b\u4ef6\u7684\u7ec4\u4ef6\u4e0a\u6dfb\u52a0\u4e8b\u4ef6\u4fa6\u542c\u5668\u3002<\/p>\n\n\n\n<p>\u5efa\u8bae\u4f7f\u7528\u6b64\u914d\u7f6e\uff0c\u56e0\u4e3a\u5b83\u7684\u4e2d\u65ad\u6700\u5c0f\uff0c\u5e76\u4e14\u4e3a\u7ec4\u4ef6\u63d0\u4f9b\u6700\u4f73\u5c01\u88c5\u3002<\/p>\n\n\n\n<p>\u4e8b\u4ef6\u6700\u591a\u53ea\u80fd\u5192\u6ce1\u3002<code>c-child<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;body&gt;\n  &lt;c-app&gt;\n    #shadow-root\n    |  &lt;c-parent&gt;\n    |    #shadow-root\n    |    |  &lt;div class=\"wrapper\"&gt;\n    |    |    &lt;c-child&gt;\n    |    |    &lt;!-- Event bubbles up here --&gt;\n    |    |      #shadow-root\n    |    |      |  &lt;h3&gt;I'm a child component&lt;\/h3&gt;\n    |    |      |  &lt;button&gt;click me&lt;\/button&gt;\n    |    |     &lt;\/c-child&gt;\n    |    |  &lt;\/div&gt;\n    |  &lt;\/c-parent&gt;\n  &lt;\/c-app&gt;\n&lt;\/body&gt;<\/code><\/pre>\n\n\n\n<p>\u68c0\u67e5\u5904\u7406\u7a0b\u5e8f\u4f1a\u5728\u4e8b\u4ef6\u4e0a\u8fd4\u56de\u8fd9\u4e9b\u503c\u3002<code>c-child<\/code><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>event.currentTarget<\/code>&nbsp;=&nbsp;<code>c-child<\/code><\/li>\n\n\n\n<li><code>event.target<\/code>&nbsp;=&nbsp;<code>c-child<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u4ece\u8fd9\u91cc\u5f00\u59cb\uff0c\u60a8\u53ef\u4ee5\u5f00\u59cb\u5b9e\u73b0\u66f4\u5bbd\u677e\u7684\u914d\u7f6e\uff0c\u5982\u4ee5\u4e0b\u51e0\u8282\u6240\u793a\u3002<\/p>\n\n\n\n<p>\u63d0\u793a<\/p>\n\n\n\n<p>lwc-recipes\u00a0\u5b58\u50a8\u5e93\u4e2d\u7684\u00a0<code>c-event-with-data<\/code>\u00a0\u7ec4\u4ef6\u4f7f\u7528\u00a0<code>c-contact-list-item<\/code>\u00a0\u7ec4\u4ef6\uff0c\u8be5\u7ec4\u4ef6\u4f7f\u7528 \u548c \u521b\u5efa\u4e8b\u4ef6\u3002<code>bubbles: falsecomposed: false<\/code><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u6c14\u6ce1\uff1a\u771f\uff0c\u7ec4\u5408\uff1a\u5047<\/h2>\n\n\n\n<p>\u4e8b\u4ef6\u901a\u8fc7 DOM \u5192\u6ce1\uff0c\u4f46\u4e0d\u4f1a\u8d8a\u8fc7\u5f71\u5b50\u8fb9\u754c\u3002\u56e0\u6b64\uff0c\u4e24\u8005\u90fd\u53ef\u4ee5\u5bf9\u4e8b\u4ef6\u505a\u51fa\u53cd\u5e94\u3002<code>c-child<\/code><code>div.wrapper<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;body&gt;\n  &lt;c-app&gt;\n    #shadow-root\n    |  &lt;c-parent&gt;\n    |    #shadow-root\n    |    |  &lt;div class=\"wrapper\"&gt;\n    |    |  &lt;!-- Event bubbles up here --&gt;\n    |    |    &lt;c-child&gt;\n    |    |    &lt;!-- Event bubbles up here --&gt;\n    |    |      #shadow-root\n    |    |      |  &lt;h3&gt;I'm a child component&lt;\/h3&gt;\n    |    |      |  &lt;button&gt;click me&lt;\/button&gt;\n    |    |    &lt;\/c-child&gt;\n    |    |  &lt;\/div&gt;\n    |  &lt;\/c-parent&gt;\n  &lt;\/c-app&gt;\n&lt;\/body&gt;<\/code><\/pre>\n\n\n\n<p>\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u8fd4\u56de\u4ee5\u4e0b\u5185\u5bb9\u3002<\/p>\n\n\n\n<p><strong><code>C-Child<\/code>&nbsp;\u5904\u7406\u7a0b\u5e8f<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>event.currentTarget<\/code>&nbsp;=&nbsp;<code>c-child<\/code><\/li>\n\n\n\n<li><code>event.target<\/code>&nbsp;=&nbsp;<code>c-child<\/code><\/li>\n<\/ul>\n\n\n\n<p><strong><code>div.childWrapper<\/code>&nbsp;\u5904\u7406\u7a0b\u5e8f<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>event.currentTarget<\/code>&nbsp;=&nbsp;<code>div.childWrapper<\/code><\/li>\n\n\n\n<li><code>event.target<\/code>&nbsp;=&nbsp;<code>c-child<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u4f7f\u7528\u6b64\u914d\u7f6e\u6709\u4e24\u4e2a\u7528\u4f8b\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u521b\u5efa\u5185\u90e8\u6d3b\u52a8<\/strong>\u82e5\u8981\u5728\u7ec4\u4ef6\u7684\u6a21\u677f\u4e2d\u5192\u6ce1\u4e8b\u4ef6\uff0c\u8bf7\u5728\u6a21\u677f\u4e2d\u7684\u5143\u7d20\u4e0a\u8c03\u5ea6\u8be5\u4e8b\u4ef6\u3002\u8be5\u4e8b\u4ef6\u4ec5\u5192\u6ce1\u5230\u6a21\u677f\u5185\u5143\u7d20\u7684\u7956\u5148\u3002\u5f53\u4e8b\u4ef6\u5230\u8fbe\u9634\u5f71\u8fb9\u754c\u65f6\uff0c\u5b83\u5c06\u505c\u6b62\u3002<code>\/\/ myComponent.js this.template.querySelector(\"div\").dispatchEvent(new CustomEvent(\"notify\", { bubbles: true }));<\/code>\u5fc5\u987b\u5728 \u4e2d\u5904\u7406\u8be5\u4e8b\u4ef6\u3002\u5305\u542b\u7ec4\u4ef6\u4e2d\u7684\u5904\u7406\u7a0b\u5e8f\u4e0d\u4f1a\u6267\u884c\uff0c\u56e0\u4e3a\u4e8b\u4ef6\u4e0d\u4f1a\u8d8a\u8fc7\u9634\u5f71\u8fb9\u754c\u3002<code>myComponent.js<\/code><code>&lt;!-- container.html --&gt; &lt;template&gt; &lt;!-- handleNotify doesn\u2019t execute --&gt; &lt;c-my-component onnotify={handleNotify}&gt;&lt;\/c-my-component&gt; &lt;\/template&gt;<\/code><\/li>\n\n\n\n<li><strong>\u5c06\u4e8b\u4ef6\u53d1\u9001\u5230\u7ec4\u4ef6\u7684\u7956\u7236\u7ea7<\/strong>\u5982\u679c\u5c06\u7ec4\u4ef6\u4f20\u9012\u5230\u69fd\u4e2d\uff0c\u5e76\u4e14\u60a8\u5e0c\u671b\u5c06\u8be5\u7ec4\u4ef6\u4e2d\u7684\u4e8b\u4ef6\u5192\u6ce1\u5230\u5305\u542b\u8be5\u7ec4\u4ef6\u7684\u6a21\u677f\uff0c\u8bf7\u5728\u4e3b\u673a\u5143\u7d20\u4e0a\u8c03\u5ea6\u8be5\u4e8b\u4ef6\u3002\u8be5\u4e8b\u4ef6\u4ec5\u5728\u5305\u542b\u7ec4\u4ef6\u7684\u6a21\u677f\u4e2d\u53ef\u89c1\u3002\u8ba9\u6211\u4eec\u770b\u4e00\u4e0b\u4ece\u00a0lwc-recipes\u00a0\u5b58\u50a8\u5e93\u4e2d\u7684\u7ec4\u4ef6\u4e2d\u5220\u8282\u7684\u793a\u4f8b\u4ee3\u7801\u3002\u4ece\u5b50\u7ea7\u5230\u7956\u7236\u7ea7\u7684\u7ec4\u4ef6\u5c42\u6b21\u7ed3\u6784\u662f \u3002<code>eventBubblingc-contact-list-item-bubbling -> lightning-layout-item -> c-event-bubbling<\/code>\u8be5\u7ec4\u4ef6\u8c03\u5ea6\u4e00\u4e2a\u8c03\u7528 \u7684\u81ea\u5b9a\u4e49\u4e8b\u4ef6\u3002<code>c-contact-list-item-bubblingcontactselectbubbles: true<\/code>\u4e8b\u4ef6\u4fa6\u542c\u5668\u4f4d\u4e8e\u5176\u7236\u7ea7 \u4e0a\uff0c\u4e8b\u4ef6\u5728\u5176\u7956\u7236\u7ea7 \u4e2d\u5904\u7406\u3002<code>oncontactselectlightning-layout-itemc-event-bubbling&lt;!-- eventBubbling.html --> &lt;template> &lt;lightning-card title=\"EventBubbling\" icon-name=\"standard:logging\"> &lt;template lwc:if={contacts.data}> &lt;lightning-layout class=\"slds-var-m-around_medium\"> &lt;!-- c-contact-list-item-bubbling emits a bubbling event so a single listener on a containing element works --> &lt;lightning-layout-item class=\"wide\" oncontactselect={handleContactSelect}> &lt;template for:each={contacts.data} for:item=\"contact\"> &lt;c-contact-list-item-bubbling class=\"slds-show slds-is-relative\" key={contact.Id} contact={contact} >&lt;\/c-contact-list-item-bubbling> &lt;\/template> &lt;\/lightning-layout-item> &lt;\/lightning-layout> &lt;\/template> &lt;\/lightning-card> &lt;\/template>\/\/ contactListItemBubbling.js import { LightningElement, api } from \"lwc\"; export default class ContactListItemBubbling extends LightningElement { @api contact; handleSelect(event) { \/\/ Prevent default behavior of anchor tag click which is to navigate to the href url event.preventDefault(); const selectEvent = new CustomEvent(\"contactselect\", { bubbles: true, }); this.dispatchEvent(selectEvent); } }<\/code><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u6c14\u6ce1\uff1a\u771f\uff0c\u7ec4\u5408\uff1a\u771f<\/h2>\n\n\n\n<p>\u4e8b\u4ef6\u901a\u8fc7 DOM \u5192\u6ce1\uff0c\u8d8a\u8fc7\u5f71\u5b50\u8fb9\u754c\uff0c\u7136\u540e\u7ee7\u7eed\u5192\u6ce1\u901a\u8fc7 DOM \u5192\u6ce1\u5230\u6587\u6863\u6839\u76ee\u5f55\u3002<\/p>\n\n\n\n<p>\u91cd\u8981<\/p>\n\n\n\n<p>\u5982\u679c\u4e8b\u4ef6\u4f7f\u7528\u6b64\u914d\u7f6e\uff0c\u5219\u4e8b\u4ef6\u7c7b\u578b\u5c06\u6210\u4e3a\u7ec4\u4ef6\u516c\u5171 API \u7684\u4e00\u90e8\u5206\u3002\u5b83\u8fd8\u5f3a\u5236\u4f7f\u7528\u7ec4\u4ef6\u53ca\u5176\u6240\u6709\u7956\u5148\u5c06\u4e8b\u4ef6\u4f5c\u4e3a\u5176 API \u7684\u4e00\u90e8\u5206\u5305\u542b\u5728\u5185\u3002<\/p>\n\n\n\n<p>\u7531\u4e8e\u6b64\u914d\u7f6e\u5c06\u4e8b\u4ef6\u4e00\u76f4\u5192\u6ce1\u5230\u6587\u6863\u6839\u76ee\u5f55\uff0c\u56e0\u6b64\u53ef\u80fd\u4f1a\u5bfc\u81f4\u540d\u79f0\u51b2\u7a81\u3002\u540d\u79f0\u51b2\u7a81\u53ef\u80fd\u4f1a\u5bfc\u81f4\u89e6\u53d1\u9519\u8bef\u7684\u4e8b\u4ef6\u4fa6\u542c\u5668\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;body&gt;\n&lt;!-- Event bubbles up here --&gt;\n  &lt;c-app&gt;\n  &lt;!-- Event bubbles up here --&gt;\n    #shadow-root\n    |  &lt;c-parent&gt;\n    |  &lt;!-- Event bubbles up here --&gt;\n    |    #shadow-root\n    |    |  &lt;div class=\"wrapper\"&gt;\n    |    |  &lt;!-- Event bubbles up here --&gt;\n    |    |    &lt;c-child&gt;\n    |    |    &lt;!-- Event bubbles up here --&gt;\n    |    |      #shadow-root\n    |    |      |  &lt;h3&gt;I'm a child component&lt;\/h3&gt;\n    |    |      |  &lt;button&gt;click me&lt;\/button&gt;\n    |    |   &lt;\/c-child&gt;\n    |    |  &lt;\/div&gt;\n    |  &lt;\/c-parent&gt;\n  &lt;\/c-app&gt;\n&lt;\/body&gt;<\/code><\/pre>\n\n\n\n<p>\u5982\u679c\u786e\u5b9e\u4f7f\u7528\u6b64\u914d\u7f6e\uff0c\u8bf7\u5728\u4e8b\u4ef6\u7c7b\u578b\u524d\u9762\u52a0\u4e0a\u547d\u540d\u7a7a\u95f4\uff0c\u4f8b\u5982 \u3002HTML \u4e8b\u4ef6\u4fa6\u542c\u5668\u5c06\u5177\u6709\u5c34\u5c2c\u7684\u540d\u79f0\u3002<code>mydomain__myevent<\/code><code>onmydomain__myevent<\/code><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u6c14\u6ce1\uff1a\u5047\uff0c\u7ec4\u5408\uff1a\u771f<\/h2>\n\n\n\n<p>Lightning Web \u7ec4\u4ef6\u4e0d\u4f7f\u7528\u6b64\u914d\u7f6e\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"communicate-across-the-dom\">\u8de8 DOM \u8fdb\u884c\u901a\u4fe1<\/h2>\n\n\n\n<p>\u6709\u4e24\u79cd\u65b9\u6cd5\u53ef\u4ee5\u5728\u4e0d\u5728\u540c\u4e00 DOM \u6811\u4e2d\u7684\u7ec4\u4ef6\u4e4b\u95f4\u8fdb\u884c\u901a\u4fe1\u3002\u4f7f\u7528 Lightning \u6d88\u606f\u670d\u52a1 \uff08\uff09\uff0c\u6216\u4f7f\u7528\u9075\u5faa\u53d1\u5e03-\u8ba2\u9605\u6a21\u5f0f\u7684\u5355\u4f8b\u5e93\u3002<code>lightning\/messageService<\/code><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f7f\u7528 Lightning \u6d88\u606f\u670d\u52a1<\/h2>\n\n\n\n<p>\u8981\u5728\u5355\u4e2a Lightning \u9875\u9762\u6216\u591a\u4e2a\u9875\u9762\u7684\u7ec4\u4ef6\u4e4b\u95f4\u8fdb\u884c\u901a\u4fe1\uff0c\u8bf7\u4f7f\u7528 Lightning \u6d88\u606f\u670d\u52a1\u901a\u8fc7 Lightning \u6d88\u606f\u901a\u9053\u8fdb\u884c\u901a\u4fe1\u3002\u4f18\u70b9\u662f\u6d88\u606f\u901a\u9053\u4e0d\u9650\u4e8e\u5355\u4e2a\u9875\u9762\u3002Lightning Experience \u5e94\u7528\u7a0b\u5e8f\u4e2d\u4fa6\u542c\u6d88\u606f\u901a\u9053\u4e0a\u4e8b\u4ef6\u7684\u4efb\u4f55\u7ec4\u4ef6\u5728\u6536\u5230\u6d88\u606f\u65f6\u90fd\u4f1a\u66f4\u65b0\u3002\u5b83\u53ef\u4ee5\u5728 Lightning Web \u7ec4\u4ef6\u3001Aura \u7ec4\u4ef6\u548c Visualforce \u9875\u9762\u4e4b\u95f4\u5de5\u4f5c\uff0c\u53ef\u4ee5\u5728 Lightning Experience \u4e2d\u7684\u4efb\u4f55\u9009\u9879\u5361\u6216\u4efb\u4f55\u5f39\u51fa\u7a97\u53e3\u4e2d\u4f7f\u7528\u3002\u5b83\u4e5f\u53ef\u4ee5\u8de8\u547d\u540d\u7a7a\u95f4\u5de5\u4f5c\u3002\u6709\u5173\u66f4\u591a\u4fe1\u606f\uff0c\u8bf7\u53c2\u9605\u4f7f\u7528 Lightning \u6d88\u606f\u670d\u52a1\u8de8 DOM \u8fdb\u884c\u901a\u4fe1\u3002<code>pubsub<\/code><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f7f\u7528 pubsub \u6a21\u5757<\/h2>\n\n\n\n<p>\u5728\u4e0d\u652f\u6301\u00a0Lightning \u6d88\u606f\u4f20\u9012\u670d\u52a1\u7684\u5bb9\u5668\u4e2d\uff0c\u4f7f\u7528\u8be5\u6a21\u5757\u3002\u4ece\u00a0github.com\/developerforce\/pubsub\u00a0\u4e0b\u8f7d\u6a21\u5757\u3002<code>pubsub<\/code><\/p>\n\n\n\n<p>\u5728\u53d1\u5e03-\u8ba2\u9605\u6a21\u5f0f\u4e2d\uff0c\u4e00\u4e2a\u7ec4\u4ef6\u53d1\u5e03\u4e00\u4e2a\u4e8b\u4ef6\u3002\u5176\u4ed6\u7ec4\u4ef6\u8ba2\u9605\u4ee5\u63a5\u6536\u548c\u5904\u7406\u4e8b\u4ef6\u3002\u8ba2\u9605\u8be5\u4e8b\u4ef6\u7684\u6bcf\u4e2a\u7ec4\u4ef6\u90fd\u4f1a\u63a5\u6536\u8be5\u4e8b\u4ef6\u3002\u8be5\u6a21\u5757\u5c06\u4e8b\u4ef6\u9650\u5236\u5728\u5355\u4e2a\u9875\u9762\u4e2d\u3002<code>pubsub<\/code><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"events-best-practices\">\u6d3b\u52a8\u6700\u4f73\u5b9e\u8df5<\/h2>\n\n\n\n<p>\u6211\u4eec\u5efa\u8bae\u5728\u5904\u7406\u4e8b\u4ef6\u65f6\u9075\u5faa\u8fd9\u4e9b\u6700\u4f73\u505a\u6cd5\u3002<code>CustomEvent.detail<\/code><\/p>\n\n\n\n<p>\u8981\u5c06\u6570\u636e\u4f20\u8fbe\u7ed9\u540c\u4e00\u5f71\u5b50\u6811\u4e2d\u7684\u5143\u7d20\uff0c\u8bf7\u4e0d\u8981\u6dfb\u52a0\u5230 .\u4e8b\u4ef6\u7684\u4f7f\u7528\u8005\u53ef\u4ee5\u4f7f\u7528 .<code>myProperty<\/code><code>event.detail<\/code><code>event.target.myProperty<\/code><\/p>\n\n\n\n<p>\u82e5\u8981\u5c06\u6570\u636e\u4f20\u8fbe\u7ed9\u4e0d\u5728\u540c\u4e00\u5f71\u5b50\u6811\u4e2d\u7684\u5143\u7d20\uff0c\u8bf7\u4f7f\u7528 .\u5728\u8fd9\u4e9b\u60c5\u51b5\u4e0b\uff0c\u4e0d\u8d77\u4f5c\u7528\uff0c\u56e0\u4e3a\u4fa6\u542c\u5668\u770b\u4e0d\u5230\u771f\u6b63\u7684\u76ee\u6807\u3002\uff08\u5f53\u4e8b\u4ef6\u5192\u6ce1 DOM \u65f6\uff0c\u5982\u679c\u5b83\u8d8a\u8fc7\u5f71\u5b50\u8fb9\u754c\uff0c\u5219 \u7684\u503c\u4f1a\u66f4\u6539\u4ee5\u5339\u914d\u4fa6\u542c\u5668\u7684\u8303\u56f4\u3002\u4e8b\u4ef6\u88ab\u91cd\u65b0\u5b9a\u4f4d\uff0c\u56e0\u6b64\u4fa6\u542c\u5668\u65e0\u6cd5\u770b\u5230\u8c03\u5ea6\u4e8b\u4ef6\u7684\u7ec4\u4ef6\u7684\u5f71\u5b50\u6811\u3002<code>event.detail<\/code><code>event.target.*<\/code><code>Event.target<\/code><\/p>\n\n\n\n<p>\u5982\u679c\u4f7f\u7528 \uff0c\u8bf7\u4f7f\u7528\u57fa\u5143\u7c7b\u578b\u3002JavaScript \u901a\u8fc7\u5f15\u7528\u4f20\u9012\u9664\u57fa\u5143\u4e4b\u5916\u7684\u6240\u6709\u6570\u636e\u7c7b\u578b\u3002\u5982\u679c\u4e00\u4e2a\u7ec4\u4ef6\u5728\u5176\u5c5e\u6027\u4e2d\u5305\u542b\u4e00\u4e2a\u5bf9\u8c61\uff0c\u4efb\u4f55\u4fa6\u542c\u5668\u90fd\u53ef\u4ee5\u5728\u7ec4\u4ef6\u4e0d\u77e5\u60c5\u7684\u60c5\u51b5\u4e0b\u6539\u53d8\u8be5\u5bf9\u8c61\uff0c\u8fd9\u662f\u4e00\u4ef6\u574f\u4e8b\uff01<code>detaildetail<\/code><\/p>\n\n\n\n<p>\u4f7f\u7528\u975e\u57fa\u5143\u7c7b\u578b\u65f6\uff0c\u53ef\u4ee5\u907f\u514d\u6cc4\u6f0f\u5185\u90e8\u72b6\u6001\u3002\u5728\u5411\u5c5e\u6027\u6dfb\u52a0\u6570\u636e\u4e4b\u524d\uff0c\u8bf7\u5c06\u5176\u590d\u5236\u5230\u65b0\u5bf9\u8c61\u6216\u6570\u7ec4\u3002\u5c06\u6570\u636e\u590d\u5236\u5230\u65b0\u5bf9\u8c61\u53ef\u786e\u4fdd\u4ec5\u53d1\u9001\u6240\u9700\u7684\u6570\u636e\uff0c\u5e76\u4e14\u63a5\u6536\u65b9\u65e0\u6cd5\u66f4\u6539\u6570\u636e\u3002<code>detail<\/code><\/p>\n\n\n\n<p>\u4e0d\u8981\u5305\u542b\u975e\u57fa\u5143 from \u6216 in \u3002\u8fd9\u4e9b\u503c\u88ab\u5305\u88f9\u5728\u53ea\u8bfb\u819c\u4e2d\u3002\u5728 IE 11 \u4e2d\uff0c\u5f53\u7a7f\u8fc7 LWC \u5230 Aura \u6865\u65f6\uff0c\u53ea\u8bfb\u819c\u4e22\u5931\uff0c\u8fd9\u610f\u5473\u7740\u53ef\u80fd\u4f1a\u53d1\u751f\u7a81\u53d8\u3002<code>@api@wiredetail<\/code>\u4e8b\u4ef6\u4f20\u64ad<\/p>\n\n\n\n<p>\u4f7f\u7528\u914d\u7f6e\u4e86 \u548c \u7684\u4e8b\u4ef6\uff0c\u56e0\u4e3a\u5b83\u4eec\u7684\u4e2d\u65ad\u6700\u5c0f\u3002\u8fd9\u4e9b\u4e8b\u4ef6\u4e0d\u4f1a\u901a\u8fc7 DOM \u5192\u6ce1\uff0c\u4e5f\u4e0d\u4f1a\u8d8a\u8fc7\u5f71\u5b50\u8fb9\u754c\u3002<code>bubbles: false<\/code><code>composed: false<\/code><\/p>\n\n\n\n<p>\u4e0d\u5efa\u8bae\u4f7f\u7528\u5192\u6ce1\u548c\u7ec4\u5408\u4e8b\u4ef6\uff0c\u56e0\u4e3a\u5b83\u4eec\u4f1a\u5192\u6ce1\u6574\u4e2a DOM \u6811\uff0c\u8de8\u8d8a\u9634\u5f71\u8fb9\u754c\uff0c\u5e76\u901a\u8fc7\u7236\u7ec4\u4ef6\uff08\u9664\u975e\u505c\u6b62\uff09\u3002\u5982\u679c\u4f7f\u7528 \u548c \u914d\u7f6e\u4e8b\u4ef6\uff0c\u5219\u4e8b\u4ef6\u7c7b\u578b\u5c06\u6210\u4e3a\u7ec4\u4ef6\u516c\u5171 API \u7684\u4e00\u90e8\u5206\u3002\u5b83\u8fd8\u5f3a\u5236\u4f7f\u7528\u7ec4\u4ef6\u53ca\u5176\u6240\u6709\u7956\u5148\u5c06\u4e8b\u4ef6\u4f5c\u4e3a\u5176 API \u7684\u4e00\u90e8\u5206\u5305\u542b\u5728\u5185\u3002\u8fd9\u662f\u4e00\u4e2a\u9700\u8981\u6ce8\u518c\u7684\u5927\u578b API \u5408\u7ea6\u3002\u5982\u679c\u4f7f\u7528\u6b64\u914d\u7f6e\uff0c\u5219\u4e8b\u4ef6\u7c7b\u578b\u5e94\u5168\u5c40\u552f\u4e00\u3002<code>bubbles: true<\/code><code>composed: true<\/code><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Lightning Web \u7ec4\u4ef6\u8c03\u5ea6\u6807\u51c6 DOM \u4e8b\u4ef6\u3002\u7ec4\u4ef6\u8fd8\u53ef\u4ee5\u521b\u5efa\u548c\u8c03\u5ea6\u81ea\u5b9a\u4e49\u4e8b\u4ef6\u3002\u4f7f\u7528\u4e8b\u4ef6\u5411\u4e0a\u4f20\u8fbe\u7ec4\u4ef6\u5305\u542b\u5c42\u6b21\u7ed3\u6784\u3002\u4f8b\u5982\uff0c\u5b50\u7ec4\u4ef6 \u8c03\u5ea6\u4e00\u4e2a\u4e8b\u4ef6\uff0c\u4ee5\u544a\u77e5\u5176\u7236\u7ec4\u4ef6 \uff0c\u7528\u6237\u9009\u62e9\u4e86\u5b83\u3002c-todo-itemc-todo-app<\/p>\n<p>Lightning Web \u7ec4\u4ef6\u4e2d\u7684\u4e8b\u4ef6\u57fa\u4e8e DOM \u4e8b\u4ef6\u6784\u5efa\uff0cDOM \u4e8b\u4ef6\u662f\u6bcf\u4e2a\u6d4f\u89c8\u5668\u4e2d\u53ef\u7528\u7684 API \u548c\u5bf9\u8c61\u7684\u96c6\u5408\u3002<\/p>\n<p>DOM \u4e8b\u4ef6\u7cfb\u7edf\u662f\u4e00\u79cd\u5305\u542b\u8fd9\u4e9b\u5143\u7d20\u7684\u7f16\u7a0b\u8bbe\u8ba1\u6a21\u5f0f\u3002<\/p>\n<p>\u4e8b\u4ef6\u540d\u79f0\uff0c\u79f0\u4e3a\u7c7b\u578b<br \/>\n\u7528\u4e8e\u521d\u59cb\u5316\u4e8b\u4ef6\u7684\u914d\u7f6e<br \/>\n\u53d1\u51fa\u4e8b\u4ef6\u7684 JavaScript \u5bf9\u8c61<\/p>\n","protected":false},"author":1,"featured_media":3848,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[247],"class_list":["post-3846","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-lightning-web-","tag-247"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u4e0e\u4e8b\u4ef6\u901a\u4fe1 - \u767d\u767d\u968f\u7b14<\/title>\n<meta name=\"description\" content=\"Lightning Web \u7ec4\u4ef6\u8c03\u5ea6\u6807\u51c6 DOM \u4e8b\u4ef6\u3002\u7ec4\u4ef6\u8fd8\u53ef\u4ee5\u521b\u5efa\u548c\u8c03\u5ea6\u81ea\u5b9a\u4e49\u4e8b\u4ef6\u3002\u4f7f\u7528\u4e8b\u4ef6\u5411\u4e0a\u4f20\u8fbe\u7ec4\u4ef6\u5305\u542b\u5c42\u6b21\u7ed3\u6784\u3002\u4f8b\u5982\uff0c\u5b50\u7ec4\u4ef6 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