{"id":3814,"date":"2024-01-06T10:34:41","date_gmt":"2024-01-06T02:34:41","guid":{"rendered":"http:\/\/www.ponybai.com\/?p=3814"},"modified":"2023-12-02T10:35:13","modified_gmt":"2023-12-02T02:35:13","slug":"%e5%ad%97%e6%ae%b5%e3%80%81%e5%b1%9e%e6%80%a7%e5%92%8c%e7%89%b9%e6%80%a7","status":"publish","type":"post","link":"http:\/\/www.ponybai.com\/?p=3814","title":{"rendered":"\u5b57\u6bb5\u3001\u5c5e\u6027\u548c\u7279\u6027"},"content":{"rendered":"\n<p>\u5728\u7ec4\u4ef6\u7684 JavaScript \u7c7b\u4e2d\u58f0\u660e\u5b57\u6bb5\u3002\u5728\u7ec4\u4ef6\u7684\u6a21\u677f\u4e2d\u5f15\u7528\u5b83\u4eec\u4ee5\u52a8\u6001\u66f4\u65b0\u5185\u5bb9\u3002<\/p>\n\n\n\n<p><em>\u5b57\u6bb5<\/em>\u548c<em>\u5c5e\u6027<\/em>\u51e0\u4e4e\u662f\u53ef\u4ee5\u4e92\u6362\u7684\u672f\u8bed\u3002\u7ec4\u4ef6\u4f5c\u8005\u58f0\u660e\u7c7b\u4e2d\u7684\u5b57\u6bb5\u3002\u7c7b\u7684\u5b9e\u4f8b\u5177\u6709\u5c5e\u6027\u3002\u5bf9\u4e8e\u7ec4\u4ef6\u4f7f\u7528\u8005\u6765\u8bf4\uff0c\u5b57\u6bb5\u662f\u5c5e\u6027\u3002\u5728 Lightning Web \u7ec4\u4ef6\u4e2d\uff0c\u53ea\u6709\u7ec4\u4ef6\u4f5c\u8005\u7528\u6765\u4fee\u9970\u7684\u5b57\u6bb5\u624d\u80fd\u4f5c\u4e3a\u5bf9\u8c61\u5c5e\u6027\u516c\u5f00\u63d0\u4f9b\u7ed9\u4f7f\u7528\u8005\u3002<code>@api<\/code><\/p>\n\n\n\n<p><em><\/em>\u5c5e\u6027\u548c<em>\u5c5e\u6027<\/em>\u51e0\u4e4e\u662f\u53ef\u4ee5\u4e92\u6362\u7684\u672f\u8bed\uff0c\u53ef\u80fd\u4f1a\u9020\u6210\u6df7\u6dc6\u3002\u4e00\u822c\u6765\u8bf4\uff0c\u5728 HTML \u4e2d\u6211\u4eec\u8c08\u8bba\u5c5e\u6027\uff0c\u5728 JavaScript \u4e2d\u6211\u4eec\u8c08\u8bba\u5c5e\u6027\u3002<\/p>\n\n\n\n<p>\u63d0\u793a<\/p>\n\n\n\n<p>\u5982\u679c\u60a8\u5df2\u7ecf\u5f00\u53d1\u8fc7 Aura \u7ec4\u4ef6\uff0c\u90a3\u4e48\u60a8\u5c31\u719f\u6089\u672f\u8bed attribute\u3002\u5728 Lightning Web \u7ec4\u4ef6\u4e2d\uff0c\u6700\u63a5\u8fd1 Aura \u5c5e\u6027\u7684\u662f JavaScript \u5c5e\u6027\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"reactivity\">\u53cd\u5e94<\/h2>\n\n\n\n<p>\u53cd\u5e94\u6027\u662f Lightning Web \u7ec4\u4ef6\u6846\u67b6\u7684\u6838\u5fc3\u7cfb\u7edf\u3002\u8be5\u6846\u67b6\u89c2\u5bdf\u5b57\u6bb5\u548c\u5c5e\u6027\u503c\u7684\u66f4\u6539\u3002\u5f53\u5b83\u89c2\u5bdf\u5230\u53d8\u5316\u65f6\uff0c\u5b83\u4f1a\u505a\u51fa\u53cd\u5e94\u3002\u5b83\u91cd\u65b0\u8ba1\u7b97\u6a21\u677f\u4e2d\u4f7f\u7528\u7684\u6240\u6709\u8868\u8fbe\u5f0f\uff0c\u5e76\u91cd\u65b0\u5448\u73b0\u7ec4\u4ef6\uff0c\u4ece\u800c\u663e\u793a\u65b0\u503c\u3002<\/p>\n\n\n\n<p><em>\u5b57\u6bb5<\/em>\u548c<em>\u5c5e\u6027<\/em>\u51e0\u4e4e\u662f\u53ef\u4ee5\u4e92\u6362\u7684\u672f\u8bed\u3002\u7ec4\u4ef6\u4f5c\u8005\u58f0\u660e\u7c7b\u4e2d\u7684\u5b57\u6bb5\u3002\u7c7b\u7684\u5b9e\u4f8b\u5177\u6709\u5c5e\u6027\u3002\u5bf9\u4e8e\u7ec4\u4ef6\u4f7f\u7528\u8005\u6765\u8bf4\uff0c\u5b57\u6bb5\u662f\u5c5e\u6027\u3002\u5728 Lightning Web \u7ec4\u4ef6\u4e2d\uff0c\u53ea\u6709\u7ec4\u4ef6\u4f5c\u8005\u7528\u6765\u4fee\u9970\u7684\u5b57\u6bb5\u624d\u80fd\u4f5c\u4e3a\u5bf9\u8c61\u5c5e\u6027\u516c\u5f00\u63d0\u4f9b\u7ed9\u4f7f\u7528\u8005\u3002<code>@api<\/code><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"public-properties\">\u516c\u5171\u5c5e\u6027<\/h2>\n\n\n\n<p>\u82e5\u8981\u516c\u5f00\u516c\u5171\u5c5e\u6027\uff0c\u8bf7\u4f7f\u7528 \u4fee\u9970\u5b57\u6bb5\u3002\u516c\u5171\u5c5e\u6027\u5b9a\u4e49\u7ec4\u4ef6\u7684 API\u3002\u6a21\u677f\u4e2d\u4f7f\u7528\u7684\u516c\u5171\u5c5e\u6027\u662f\u53cd\u5e94\u5f0f\u7684\u3002\u5982\u679c\u6a21\u677f\u4e2d\u4f7f\u7528\u7684\u516c\u5171\u5c5e\u6027\u7684\u503c\u53d1\u751f\u66f4\u6539\uff0c\u5219\u7ec4\u4ef6\u5c06\u91cd\u65b0\u5448\u73b0\u3002<code>@api<\/code><\/p>\n\n\n\n<p>\u5f53\u7ec4\u4ef6\u91cd\u65b0\u6e32\u67d3\u65f6\uff0c\u5c06\u91cd\u65b0\u8ba1\u7b97\u6a21\u677f\u4e2d\u4f7f\u7528\u7684\u8868\u8fbe\u5f0f\uff0c\u5e76\u6267\u884c\u00a0<code>renderedCallback\uff08\uff09<\/code>\u00a0\u751f\u547d\u5468\u671f\u94a9\u5b50\u3002<\/p>\n\n\n\n<p>@api\u88c5\u9970\u5668<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-rich\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/youtube.com\/watch?v=F7J5yn3MIXw\n<\/div><\/figure>\n\n\n\n<p>\u63d0\u793a<\/p>\n\n\n\n<p>\u88c5\u9970\u5668\u662f\u4e00\u79cd JavaScript \u8bed\u8a00\u529f\u80fd\u3002<code>@api<\/code>\u88c5\u9970\u5668\u662f Lightning Web \u7ec4\u4ef6\u72ec\u6709\u7684\u3002\u4e00\u4e2a\u5b57\u6bb5\u53ea\u80fd\u6709\u4e00\u4e2a\u4fee\u9970\u5668\u3002<\/p>\n\n\n\n<p>\u4ece \u5bfc\u5165\u88c5\u9970\u5668\u3002\u6b64\u4ee3\u7801\u5c06\u5b57\u6bb5\u516c\u5f00\u4e3a\u516c\u5171\u5c5e\u6027\u3002<code>@api<\/code><code>lwc<\/code><code>itemName<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ todoItem.js\nimport { LightningElement, api } from \"lwc\";\nexport default class TodoItem extends LightningElement {\n  @api itemName = \"New Item\";\n}<\/code><\/pre>\n\n\n\n<p>\u5728\u6a21\u677f\u4e2d\u663e\u793a\u7684\u503c\u3002<code>itemName<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- todoItem.html --&gt;\n&lt;template&gt;\n  &lt;div class=\"view\"&gt;\n    &lt;label&gt;{itemName}&lt;\/label&gt;\n  &lt;\/div&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<p>\u6b64 JavaScript \u7c7b\u548c HTML \u6a21\u677f\u5b9a\u4e49\u7ec4\u4ef6\uff0c\u5176\u4e2d\u662f\u547d\u540d\u7a7a\u95f4\u3002\u4f7f\u7528\u8be5\u7ec4\u4ef6\u7684\u7ec4\u4ef6\u53ef\u4ee5\u8bbe\u7f6e\u8be5\u5c5e\u6027\u3002<code>c-todo-item<\/code><code>c<\/code><code>c-todo-item<\/code><code>itemName<\/code><\/p>\n\n\n\n<p>\u6ce8\u610f<\/p>\n\n\n\n<p>JavaScript \u4e2d\u7684\u5c5e\u6027\u540d\u79f0\u91c7\u7528\u9a7c\u5cf0\u5927\u5c0f\u5199\uff0c\u800c HTML \u5c5e\u6027\u540d\u79f0\u91c7\u7528\u70e4\u8089\u4e32\u5927\u5c0f\u5199\uff08\u7834\u6298\u53f7\u5206\u9694\uff09\u4ee5\u5339\u914d HTML \u6807\u51c6\u3002\u5728 \u4e2d\uff0c\u6807\u8bb0\u4e2d\u7684\u5c5e\u6027\u6620\u5c04\u5230 \u7684 JavaScript \u5c5e\u6027\u3002<code>todoApp.html<\/code><code>item-name<\/code><code>itemName<\/code><code>c-todo-item<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- todoApp.html --&gt;\n&lt;template&gt;\n  &lt;div class=\"listing\"&gt;\n    &lt;c-todo-item item-name=\"Milk\"&gt;&lt;\/c-todo-item&gt;\n    &lt;c-todo-item item-name=\"Bread\"&gt;&lt;\/c-todo-item&gt;\n  &lt;\/div&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<p>\u5728\u5176\u6807\u8bb0\u4e2d\u4f7f\u7528\u7ec4\u4ef6\u7684\u6240\u6709\u8005\u7ec4\u4ef6\u53ef\u4ee5\u901a\u8fc7 DOM \u5c5e\u6027\u8bbf\u95ee\u7ec4\u4ef6\u7684\u516c\u5171\u5c5e\u6027\u3002DOM \u5c5e\u6027\u662f\u5728\u7c7b\u4e2d\u58f0\u660e\u7684\u516c\u5171\u5b57\u6bb5\u3002\u5b83\u4eec\u53ef\u4ee5\u901a\u8fc7\u5e26\u6709\u70b9\u8868\u793a\u6cd5\u7684 DOM \u5143\u7d20\u8bbf\u95ee\u3002\u5728\u6b64\u793a\u4f8b\u4e2d\uff0c\u8be5\u7ec4\u4ef6\u5c06\u4e00\u4e2a\u516c\u5171\u5b57\u6bb5\u58f0\u660e\u4e3a \uff0c\u5176\u503c\u53ef\u901a\u8fc7 \uff08DOM \u5143\u7d20\uff09\u5b9e\u4f8b\u4e0a\u7684 DOM \u5c5e\u6027\u8bbf\u95ee\u3002<code>c-todo-item<\/code><code>@api itemName<\/code><code>c-todo-item<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ todoApp.js\nmyItem = this.template.querySelector(\"c-todo-item\").itemName;<\/code><\/pre>\n\n\n\n<p>\u63d0\u793a<\/p>\n\n\n\n<p>\u8bf7\u53c2\u9605\u5b58\u50a8\u5e93\u4e2d\u7684\u00a0CompositionBasics\u00a0\u793a\u4f8b\u3002<code>lwc-recipes<\/code><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"reactivity-for-fields-objects-and-arrays\">\u5b57\u6bb5\u3001\u5bf9\u8c61\u548c\u6570\u7ec4\u7684\u53cd\u5e94\u6027<\/h2>\n\n\n\n<p>\u5982\u679c\u5b57\u6bb5\u7684\u503c\u53d1\u751f\u66f4\u6539\uff0c\u5e76\u4e14\u8be5\u5b57\u6bb5\u5728\u6a21\u677f\u4e2d\u4f7f\u7528\u6216\u5728\u6a21\u677f\u4e2d\u4f7f\u7528\u7684\u5c5e\u6027\u7684 getter \u4e2d\u4f7f\u7528\uff0c\u5219\u7ec4\u4ef6\u5c06\u91cd\u65b0\u5448\u73b0\u5e76\u663e\u793a\u65b0\u503c\u3002\u5982\u679c\u4e3a\u5b57\u6bb5\u5206\u914d\u4e86\u5bf9\u8c61\u6216\u6570\u7ec4\uff0c\u5219\u6846\u67b6\u4f1a\u89c2\u5bdf\u5230\u5bf9\u8c61\u6216\u6570\u7ec4\u5185\u90e8\u7684\u4e00\u4e9b\u66f4\u6539\uff0c\u4f8b\u5982\u5728\u5206\u914d\u65b0\u503c\u65f6\u3002<\/p>\n\n\n\n<p>\u5f53\u7ec4\u4ef6\u91cd\u65b0\u6e32\u67d3\u65f6\uff0c\u5c06\u91cd\u65b0\u8ba1\u7b97\u6a21\u677f\u4e2d\u4f7f\u7528\u7684\u8868\u8fbe\u5f0f\uff0c\u5e76\u6267\u884c\u00a0<code>renderedCallback\uff08\uff09<\/code>\u00a0\u751f\u547d\u5468\u671f\u94a9\u5b50\u3002<\/p>\n\n\n\n<p>\u5f53\u60a8\u5728\u201c\u540d\u5b57\u201d\u6216\u201c\u59d3\u6c0f\u201d\u5b57\u6bb5\u4e2d\u8f93\u5165\u503c\u65f6\uff0c\u7ec4\u4ef6\u4f1a\u5c06\u5176\u8f6c\u6362\u4e3a\u5927\u5199\u5e76\u663e\u793a\u3002<\/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\/hello_expressions.png\" alt=\"\u540d\u5b57\u548c\u59d3\u6c0f\u7684\u8f93\u5165\u5b57\u6bb5\u3002\u8f93\u5165\u7684\u540d\u79f0\u5c06\u8f6c\u6362\u4e3a\u5927\u5199\u3002\"\/><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- helloExpressions.html --&gt;\n\n&lt;template&gt;\n  &lt;lightning-card title=\"HelloExpressions\" icon-name=\"custom:custom14\"&gt;\n    &lt;div class=\"slds-m-around_medium\"&gt;\n      &lt;lightning-input\n        name=\"firstName\"\n        label=\"First Name\"\n        onchange={handleChange}\n      &gt;&lt;\/lightning-input&gt;\n      &lt;lightning-input\n        name=\"lastName\"\n        label=\"Last Name\"\n        onchange={handleChange}\n      &gt;&lt;\/lightning-input&gt;\n      &lt;p class=\"slds-m-top_medium\"&gt;Uppercased Full Name: {uppercasedFullName}&lt;\/p&gt;\n    &lt;\/div&gt;\n  &lt;\/lightning-card&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<p>\u7ec4\u4ef6\u7684\u7c7b\u5b9a\u4e49\u4e86 \u548c \u5b57\u6bb5\u3002\u7531\u4e8e\u5b83\u4eec\u5728\u6a21\u677f \uff08\uff09 \u4e2d\u4f7f\u7528\u7684\u5c5e\u6027\u7684 getter \u4e2d\u4f7f\u7528\uff0c\u56e0\u6b64\u5f53\u5176\u503c\u66f4\u6539\u65f6\uff0c\u7ec4\u4ef6\u4f1a\u91cd\u65b0\u5448\u73b0\u3002<code>firstName<\/code><code>lastName<\/code><code>uppercasedFullName<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ helloExpressions.js\n\nimport { LightningElement } from \"lwc\";\n\nexport default class TrackExample extends LightningElement {\n  firstName = \"\";\n  lastName = \"\";\n\n  handleChange(event) {\n    const field = event.target.name;\n    if (field === \"firstName\") {\n      this.firstName = event.target.value;\n    } else if (field === \"lastName\") {\n      this.lastName = event.target.value;\n    }\n  }\n\n  get uppercasedFullName() {\n    return `${this.firstName} ${this.lastName}`.trim().toUpperCase();\n  }\n}<\/code><\/pre>\n\n\n\n<p>\u6ce8\u610f<\/p>\n\n\n\n<p>\u5b57\u6bb5\u662f\u53cd\u5e94\u5f0f\u7684\u3002Expando \u5c5e\u6027\u662f\u5728\u8fd0\u884c\u65f6\u6dfb\u52a0\u5230\u5bf9\u8c61\u7684\u5c5e\u6027\uff0c\u4e0d\u662f\u54cd\u5e94\u5f0f\u7684\u3002<\/p>\n\n\n\n<p>\u63d0\u793a<\/p>\n\n\n\n<p>\u8bf7\u53c2\u9605\u5b58\u50a8\u5e93\u4e2d\u7684\u00a0helloExpressions\u00a0\u7ec4\u4ef6\u3002<code>lwc-recipes<\/code><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u53cd\u5e94\u6027\u6ce8\u610f\u4e8b\u9879<\/h2>\n\n\n\n<p>\u5c3d\u7ba1\u5b57\u6bb5\u662f\u53cd\u5e94\u5f0f\u7684\uff0c\u4f46 LWC \u5f15\u64ce\u4ee5\u6d45\u5c42\u65b9\u5f0f\u8ddf\u8e2a\u5b57\u6bb5\u503c\u66f4\u6539\u3002\u901a\u8fc7\u4f7f\u7528 \u6bd4\u8f83\u503c\u6807\u8bc6\u6765\u5c06\u65b0\u503c\u5206\u914d\u7ed9\u5b57\u6bb5\u65f6\uff0c\u5c06\u68c0\u6d4b\u5230\u66f4\u6539\u3002\u6b64\u65b9\u6cd5\u9002\u7528\u4e8e\u6570\u5b57\u6216\u5e03\u5c14\u503c\u7b49\u57fa\u5143\u7c7b\u578b\u3002<code>===<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import { LightningElement } from \"lwc\";\n\nexport default class ReactivityExample extends LightningElement {\n  bool = true;\n  number = 42;\n  obj = { name: \"John\" };\n\n  checkMutation() {\n    this.bool = false; \/\/ Mutation detected\n\n    this.number = 42; \/\/ No mutation detected: previous value is equal to the newly assigned value\n    this.number = 43; \/\/ Mutation detected\n\n    this.obj.name = \"Bob\"; \/\/ No mutation detect: `obj` field value is not reassigned\n    this.obj = { name: \"John\" }; \/\/ Mutation detected - redefining the object with the same value creates a new object\n    this.obj = { ...this.obj, title: \"CEO\" }; \/\/ Mutation detected\n  }\n}<\/code><\/pre>\n\n\n\n<p>\u5728\u64cd\u4f5c\u590d\u6742\u7c7b\u578b\uff08\u5982\u5bf9\u8c61\u548c\u6570\u7ec4\uff09\u65f6\uff0c\u5fc5\u987b\u521b\u5efa\u4e00\u4e2a\u65b0\u5bf9\u8c61\u5e76\u5c06\u5176\u5206\u914d\u7ed9\u8981\u68c0\u6d4b\u66f4\u6539\u7684\u5b57\u6bb5\u3002<\/p>\n\n\n\n<p>\u4e3a\u4e86\u907f\u514d\u5728\u5904\u7406\u590d\u6742\u5bf9\u8c61\u65f6\u51fa\u73b0\u6b64\u7c7b\u95ee\u9898\uff0c\u8bf7\u4f7f\u7528\u4fee\u9970\u5668\u6df1\u5165\u8ddf\u8e2a\u5bf9\u5b57\u6bb5\u503c\u6240\u505a\u7684\u66f4\u6539\u3002<code>@track<\/code><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u8ddf\u8e2a\u5bf9\u8c61\u548c\u6570\u7ec4\u5185\u90e8\u7684\u66f4\u6539<\/h2>\n\n\n\n<p>\u82e5\u8981\u89c2\u5bdf\u5bf9\u8c61\u5c5e\u6027\u6216\u6570\u7ec4\u5143\u7d20\u7684\u66f4\u6539\uff0c\u8bf7\u4f7f\u7528 \u4fee\u9970\u5b57\u6bb5\u3002<code>@track<\/code><\/p>\n\n\n\n<p>\u5f53\u5b57\u6bb5\u4fee\u9970\u6709 \u65f6\uff0cLightning Web \u7ec4\u4ef6\u4f1a\u8ddf\u8e2a\u5bf9\u4ee5\u4e0b\u5404\u9879\u5185\u90e8\u503c\u7684\u66f4\u6539\uff1a<code>@track<\/code><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528\u4ee5\u4e0b\u65b9\u5f0f\u521b\u5efa\u7684\u666e\u901a\u5bf9\u8c61<code>{}<\/code><\/li>\n\n\n\n<li>\u4f7f\u7528<code>[]<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u8be5\u6846\u67b6\u4ee5\u9012\u5f52\u65b9\u5f0f\u89c2\u5bdf\u5bf9\u666e\u901a\u5bf9\u8c61\u548c\u6570\u7ec4\u7684\u7a81\u53d8\uff0c\u5305\u62ec\u5d4c\u5957\u5bf9\u8c61\u3001\u5d4c\u5957\u6570\u7ec4\u4ee5\u53ca\u5bf9\u8c61\u548c\u6570\u7ec4\u7684\u6df7\u5408\u3002\u8fd8\u5904\u7406\u5faa\u73af\u5f15\u7528\u3002<\/p>\n\n\n\n<p>\u4f46\u662f\uff0c\u8be5\u6846\u67b6\u4e0d\u4f1a\u89c2\u5bdf\u5230\u5bf9\u590d\u6742\u5bf9\u8c61\uff08\u4f8b\u5982\u7ee7\u627f\u81ea \u3001\u7c7b\u5b9e\u4f8b\u3001 \u3001 \u6216 \u7684\u5bf9\u8c61\uff09\u7684\u7a81\u53d8\u3002<code>Object<\/code><code>Date<\/code><code>Set<\/code><code>Map<\/code><\/p>\n\n\n\n<p>@track\u88c5\u9970\u5668<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-rich\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/youtube.com\/watch?v=evIUIHcWbZI\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u89c2\u5bdf\u5bf9\u8c61\u7684\u5c5e\u6027<\/h2>\n\n\n\n<p>\u8981\u544a\u8bc9\u6846\u67b6\u89c2\u5bdf\u5bf9\u8c61\u5c5e\u6027\u7684\u53d8\u5316\uff0c\u8bf7\u4f7f\u7528 \u4fee\u9970\u5b57\u6bb5\u3002<code>@track<\/code><\/p>\n\n\n\n<p>\u6ce8\u610f<\/p>\n\n\n\n<p>\u5982\u524d\u6240\u8ff0\uff0c\u5728\u4e0d\u4f7f\u7528 \u7684\u60c5\u51b5\u4e0b\uff0c\u6846\u67b6\u4f1a\u89c2\u5bdf\u5230\u4e3a\u5b57\u6bb5\u5206\u914d\u65b0\u503c\u7684\u66f4\u6539\u3002\u5982\u679c\u65b0\u503c\u4e0d\u662f\u4ee5\u524d\u7684\u503c\uff0c\u5219\u7ec4\u4ef6\u5c06\u91cd\u65b0\u5448\u73b0\u3002<code>@track<\/code><code>===<\/code><\/p>\n\n\n\n<p>\u4f8b\u5982\uff0c\u8ba9\u6211\u4eec\u7a0d\u5fae\u66f4\u6539\u4ee3\u7801\u4ee5\u58f0\u660e\u5b57\u6bb5\uff0c\u8be5\u5b57\u6bb5\u5305\u542b\u4e00\u4e2a\u5177\u6709\u4e24\u4e2a\u5c5e\u6027\u7684\u5bf9\u8c61\uff0c\u4ee5\u53ca .\u8be5\u6846\u67b6\u4f1a\u89c2\u5bdf\u5230\u5c06\u65b0\u503c\u5206\u914d\u7ed9 \u7684\u66f4\u6539\u3002<code>fullName<\/code><code>firstName<\/code><code>lastName<\/code><code>fullName<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>fullName = { firstName: \"\", lastName: \"\" };<\/code><\/pre>\n\n\n\n<p>\u6b64\u4ee3\u7801\u4e3a\u5b57\u6bb5\u5206\u914d\u4e00\u4e2a\u65b0\u503c\uff0c\u4ee5\u4fbf\u7ec4\u4ef6\u91cd\u65b0\u5448\u73b0\u3002<code>fullName<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ Component rerenders.\nthis.fullName = { firstName: \"John\", lastName: \"Doe\" };<\/code><\/pre>\n\n\n\n<p>\u4f46\u662f\uff0c\u5982\u679c\u6211\u4eec\u4e3a\u5bf9\u8c61\u7684\u67d0\u4e2a\u5c5e\u6027\u5206\u914d\u4e00\u4e2a\u65b0\u503c\uff0c\u5219\u7ec4\u4ef6\u4e0d\u4f1a\u91cd\u65b0\u5448\u73b0\uff0c\u56e0\u4e3a\u4e0d\u4f1a\u89c2\u5bdf\u5230\u8fd9\u4e9b\u5c5e\u6027\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ Component doesn't rerender.\nthis.fullName.firstName = \"John\";<\/code><\/pre>\n\n\n\n<p>\u8be5\u6846\u67b6\u4f1a\u89c2\u5bdf\u5230\u4e3a\u5b57\u6bb5\u5206\u914d\u65b0\u503c\u7684\u66f4\u6539\u3002\u6b64\u4ee3\u7801\u4e0d\u4f1a\u6267\u884c\u6b64\u64cd\u4f5c\uff0c\u800c\u662f\u4e3a\u5bf9\u8c61\u7684\u5c5e\u6027\u5206\u914d\u4e00\u4e2a\u65b0\u503c\u3002<code>fullName<\/code><code>firstName<\/code><code>fullName<\/code><\/p>\n\n\n\n<p>\u8981\u544a\u8bc9\u6846\u67b6\u89c2\u5bdf\u5bf9\u8c61\u5c5e\u6027\u7684\u53d8\u5316\uff0c\u8bf7\u4f7f\u7528 \u4fee\u9970\u5b57\u6bb5\u3002\u73b0\u5728\uff0c\u5982\u679c\u6211\u4eec\u66f4\u6539\u4efb\u4e00\u5c5e\u6027\uff0c\u7ec4\u4ef6\u5c31\u4f1a\u91cd\u65b0\u6e32\u67d3\u3002<code>fullName<\/code><code>@track<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ Component rerenders.\n@track fullName = { firstName : '', lastName : ''};\nthis.fullName.firstName = 'John';<\/code><\/pre>\n\n\n\n<p>\u5982\u679c\u5c5e\u6027\u5305\u542b\u5bf9\u8c61\uff0c\u82e5\u8981\u8ddf\u8e2a\u5bf9\u8c61\u5c5e\u6027\u7684\u66f4\u6539\uff0c\u8bf7\u4f7f\u7528 \u6ce8\u91ca\u8be5\u5c5e\u6027\u3002\u4e3a\u4e86\u7406\u89e3\uff0c\u8ba9\u6211\u4eec\u4fee\u6539\u6211\u4eec\u7684\u793a\u4f8b\u3002\u6211\u4eec\u7684\u793a\u4f8b\u521d\u59cb\u5316 and \u4e3a\u7a7a\u5b57\u7b26\u4e32\uff0c\u8fd9\u4e9b\u5b57\u7b26\u4e32\u662f\u539f\u59cb\u503c\uff0c\u56e0\u6b64\u7ec4\u4ef6\u5728\u5b83\u4eec\u66f4\u6539\u65f6\u4f1a\u91cd\u65b0\u5448\u73b0\u3002<code>@track<\/code><code>firstName<\/code><code>lastName<\/code><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f7f\u7528\u65b0\u5c5e\u6027\u91cd\u65b0\u5448\u73b0\u5bf9\u8c61<\/h2>\n\n\n\n<p>\u4ec5\u5f53\u66f4\u65b0\u4e86\u5728\u4e0a\u4e00\u4e2a\u6e32\u67d3\u5468\u671f\u4e2d\u8bbf\u95ee\u7684\u5c5e\u6027\u65f6\uff0c\u7ec4\u4ef6\u624d\u4f1a\u91cd\u65b0\u6e32\u67d3\uff0c\u5373\u4f7f\u5bf9\u8c61\u4f7f\u7528 \u6279\u6ce8\u4e86 \u3002\u8fd9\u6837\u53ef\u4ee5\u9632\u6b62\u7ec4\u4ef6\u8fc7\u5ea6\u91cd\u65b0\u6e32\u67d3\uff0c<code>@track<\/code><\/p>\n\n\n\n<p>\u8003\u8651\u8fd9\u4e2a\u8ddf\u8e2a\u5bf9\u8c61\u548c\u4e00\u4e2a\u6253\u5370\u5bf9\u8c61\u5c5e\u6027\u7684 getter\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>@track obj = {value1: 'Hello'};\n\nget words() {\n    return Object.entries(this.obj)\n              .map((&#91;key, value]) =&gt; ({key, value}));\n  }<\/code><\/pre>\n\n\n\n<p>\u5728\u7b2c\u4e00\u4e2a\u6e32\u67d3\u5468\u671f\u4e2d\uff0c\u6846\u67b6\u4f1a\u8bb0\u5f55\u6240\u8bbf\u95ee\u7684\u5185\u5bb9\u3002\u4efb\u4f55\u4e0d\u5f71\u54cd\u7684\u7a81\u53d8\u90fd\u4f1a\u88ab\u5ffd\u7565\uff0c\u56e0\u4e3a\u5b83\u4e0d\u4f1a\u5f71\u54cd\u5448\u73b0\u7684\u5185\u5bb9\u3002\u56e0\u6b64\uff0c\u66f4\u6539 \u4f1a\u89e6\u53d1\u91cd\u65b0\u5448\u73b0\uff0c\u4f46\u5411 \u6dfb\u52a0\u65b0\u5c5e\u6027\u6216\u66f4\u6539\u4e0d\u4f1a\u89e6\u53d1\u91cd\u65b0\u5448\u73b0\u3002<code>obj.value1<\/code><code>obj<\/code><code>value1<\/code><code>value1<\/code><code>obj<\/code><code>value2<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ Component rerenders.\nsetValue1(e) {\n  this.obj.value1 = 'Hello World';\n}\n\n\/\/ Component doesn\u2019t rerender.\nsetValue2(e) {\n  this.obj.value2 = 'Hello LWC';\n}<\/code><\/pre>\n\n\n\n<p>\u82e5\u8981\u5728\u6dfb\u52a0\u65b0\u5c5e\u6027\u65f6\u91cd\u65b0\u5448\u73b0\u7ec4\u4ef6\uff0c\u8bf7\u5c06\u8be5\u5bf9\u8c61\u5206\u914d\u7ed9\u5177\u6709\u8fd9\u4e24\u4e2a\u503c\u7684\u65b0\u5bf9\u8c61\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>setValue2(e) {\n  this.obj = {\n    ...this.obj,\n      value2: 'Hello LWC'\n  };\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u89c2\u5bdf\u6570\u7ec4\u7684\u5143\u7d20<\/h2>\n\n\n\n<p>\u53e6\u4e00\u4e2a\u7528\u4f8b\u662f\u544a\u8bc9\u6846\u67b6\u89c2\u5bdf\u6570\u7ec4\u5143\u7d20\u7684\u53d8\u5316\u3002<code>@track<\/code><\/p>\n\n\n\n<p>\u5982\u679c\u4e0d\u4f7f\u7528 \uff0c\u6846\u67b6\u4f1a\u89c2\u5bdf\u5230\u4e3a\u5b57\u6bb5\u5206\u914d\u65b0\u503c\u7684\u66f4\u6539\u3002<code>@track<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>arr = &#91;\"a\", \"b\"];<\/code><\/pre>\n\n\n\n<p>\u5f53\u60a8\u5c06\u65b0\u503c\u5206\u914d\u7ed9 \u65f6\uff0c\u7ec4\u4ef6\u5c06\u91cd\u65b0\u5448\u73b0\u3002<code>arr<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ Component rerenders.\nthis.arr = &#91;\"x\", \"y\", \"z\"];<\/code><\/pre>\n\n\n\n<p>\u4f46\u662f\uff0c\u5982\u679c\u6211\u4eec\u5728\u6570\u7ec4\u4e2d\u66f4\u65b0\u6216\u6dfb\u52a0\u5143\u7d20\uff0c\u5219\u8be5\u7ec4\u4ef6\u4e0d\u4f1a\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ Component doesn\u2019t rerender.\nthis.arr&#91;0] = \"x\";\nthis.arr.push(\"c\");<\/code><\/pre>\n\n\n\n<p>\u82e5\u8981\u544a\u8bc9\u6846\u67b6\u89c2\u5bdf\u6570\u7ec4\u5143\u7d20\u7684\u53d8\u5316\uff0c\u8bf7\u4f7f\u7528 \u6b64\u5916\uff0c\u6846\u67b6\u4e0d\u4f1a\u81ea\u52a8\u5c06\u6570\u7ec4\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\u4ee5\u66f4\u65b0\u6570\u7ec4\u5143\u7d20\u3002\u8981\u8fd4\u56de\u66f4\u65b0\u7684\u5b57\u7b26\u4e32\uff0c\u8bf7\u4f7f\u7528 getter \u5c06\u6570\u7ec4\u7684\u5143\u7d20\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\u3002<code>arr<\/code><code>@track<\/code><code>join()<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>@track arr = &#91;'a','b'];\n\nget computedArray() { return this.arr.join(','); }\n\nupdate() {\n  this.arr&#91;0] = 'x';\n  this.arr.push('c');\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u89c2\u5bdf\u590d\u6742\u7269\u4f53<\/h2>\n\n\n\n<p>\u8ba9\u6211\u4eec\u770b\u4e00\u4e2a\u5b57\u6bb5\u4e3a \u7684\u7ec4\u4ef6\uff0c\u5176\u7c7b\u578b\u4e3a \u3002\u8be5\u6a21\u677f\u6709\u51e0\u4e2a\u6309\u94ae\uff0c\u7528\u4e8e\u66f4\u6539 \u7684\u5185\u90e8\u72b6\u6001\u3002\u6b64\u793a\u4f8b\u7a81\u51fa\u663e\u793a\u4e86\u521b\u5efa\u5bf9\u8c61\uff0c\u56e0\u4e3a\u5b83\u4e0d\u662f\u666e\u901a\u7684 JavaScript \u5bf9\u8c61\uff0cLWC \u5f15\u64ce\u4e0d\u4f1a\u89c2\u5bdf\u5230\u5185\u90e8\u72b6\u6001\u7a81\u53d8\uff0c\u5373\u4f7f\u4ee3\u7801\u4f7f\u7528 .<code>x<\/code><code>Date<\/code><code>x<\/code><code>new Date()<\/code><code>@track<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ trackDate.js\nimport { LightningElement, track } from \"lwc\";\nexport default class TrackDate extends LightningElement {\n  @track x = new Date();\n\n  initDate() {\n    this.x = new Date();\n  }\n\n  updateDate() {\n    this.x.setHours(7); \/\/ No mutation detected\n  }\n}<\/code><\/pre>\n\n\n\n<p>\u4e0e\u524d\u9762\u7684\u793a\u4f8b\u7c7b\u4f3c\uff0c\u8be5\u6a21\u677f\u6709\u51e0\u4e2a\u6309\u94ae\u53ef\u4ee5\u66f4\u6539 \u7684\u5185\u90e8\u72b6\u6001\u3002<code>x<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- trackDate.html --&gt;\n&lt;template&gt;\n  &lt;p&gt;Date: {x}&lt;\/p&gt;\n\n  &lt;button onclick={initDate}&gt;Init&lt;\/button&gt;\n  &lt;button onclick={updateDate}&gt;Update&lt;\/button&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<p>\u5355\u51fb\u201c<strong>\u521d\u59cb\u5316<\/strong>\u201d\u6309\u94ae\u65f6\uff0c\u5c06\u89c2\u5bdf\u5230\u66f4\u6539\u5e76\u91cd\u65b0\u5448\u73b0\u6a21\u677f\u3002Lightning Web Components \u89c2\u5bdf\u5230\u5b83\u6307\u5411\u4e00\u4e2a\u65b0\u5bf9\u8c61\u3002\u4f46\u662f\uff0c\u5355\u51fb\u201c<strong>\u66f4\u65b0<\/strong>\u201d\u65f6\uff0c\u4e0d\u4f1a\u91cd\u65b0\u5448\u73b0\u6a21\u677f\u3002Lightning Web \u7ec4\u4ef6\u4e0d\u4f1a\u89c2\u5bdf\u5230\u5bf9\u8c61\u503c\u7684\u53d8\u5316\u3002<code>x<\/code><code>Date<\/code><code>Date<\/code><\/p>\n\n\n\n<p>\u82e5\u8981\u786e\u4fdd\u5728\u503c\u66f4\u6539\u65f6\u91cd\u65b0\u5448\u73b0\u6a21\u677f\uff0c\u8bf7\u514b\u9686\u73b0\u6709\u65e5\u671f\u5e76\u66f4\u65b0\u5176\u503c\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>updateDate() {\n  const cloned = new Date(this.x.getTime());\n  cloned.setHours(7);\n\n  \/\/ Assign the new date instance to rerender the component.\n  this.x = cloned;\n}<\/code><\/pre>\n\n\n\n<p>\u6ce8\u610f<\/p>\n\n\n\n<p>\u5c06\u5c5e\u6027\u8bbe\u7f6e\u4e3a\u65e0\u6cd5\u8ddf\u8e2a\u7684\u503c\u65f6\uff0c\u5c06\u8bb0\u5f55\u8b66\u544a\u3002\u5982\u679c\u5c1d\u8bd5\u8c03\u8bd5\u7ec4\u4ef6\u5728\u66f4\u6539\u65f6\u672a\u91cd\u65b0\u5448\u73b0\u7684\u65b9\u6848\uff0c\u8bf7\u67e5\u770b\u6d4f\u89c8\u5668\u63a7\u5236\u53f0\u3002\u5728\u6211\u4eec\u7684\u793a\u4f8b\u4e2d\uff0c\u6d4f\u89c8\u5668\u63a7\u5236\u53f0\u4f1a\u8bb0\u5f55\u4ee5\u4e0b\u6709\u7528\u7684\u8b66\u544a\uff1a<\/p>\n\n\n\n<p><code>Property \"x\" of [object:vm TrackDate] is set to a non-trackable object, which means changes into that object cannot be observed.<\/code><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"property-and-attribute-names\">\u5c5e\u6027\u548c\u5c5e\u6027\u540d\u79f0<\/h2>\n\n\n\n<p>JavaScript \u4e2d\u7684\u5c5e\u6027\u540d\u79f0\u91c7\u7528\u9a7c\u5cf0\u5927\u5c0f\u5199\uff0c\u800c HTML \u5c5e\u6027\u540d\u79f0\u91c7\u7528\u70e4\u8089\u4e32\u5927\u5c0f\u5199\uff08\u7834\u6298\u53f7\u5206\u9694\uff09\u4ee5\u5339\u914d HTML \u6807\u51c6\u3002<\/p>\n\n\n\n<p>\u4f8b\u5982\uff0c\u540d\u4e3a \u7684 JavaScript \u5c5e\u6027\u6620\u5c04\u5230\u540d\u4e3a \u7684 HTML \u5c5e\u6027\u3002<code>itemName<\/code><code>item-name<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ child.js\nimport { LightningElement, api } from \"lwc\";\n\nexport default class extends LightningElement {\n  @api itemName;\n}<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- parent.html --&gt;\n&lt;template&gt;\n  &lt;c-child item-name=\"Child item\"&gt;&lt;\/c-child&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">JavaScript \u5c5e\u6027\u540d\u79f0<\/h2>\n\n\n\n<p>\u4e0d\u8981\u4ee5\u8fd9\u4e9b\u5b57\u7b26\u5f00\u5934\u5c5e\u6027\u540d\u79f0\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>on<\/code>\uff08\u4f8b\u5982\uff0c<code>onClick<\/code>)<\/li>\n\n\n\n<li><code>aria<\/code>\uff08\u4f8b\u5982\uff0c<code>ariaDescribedby<\/code>)<\/li>\n\n\n\n<li><code>data<\/code>\uff08\u4f8b\u5982\uff0c<code>dataProperty<\/code>)<\/li>\n<\/ul>\n\n\n\n<p>\u4e0d\u8981\u5c06\u8fd9\u4e9b\u4fdd\u7559\u5b57\u7528\u4e8e\u5c5e\u6027\u540d\u79f0\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>slot<\/code><\/li>\n\n\n\n<li><code>part<\/code><\/li>\n\n\n\n<li><code>is<\/code><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">HTML \u5c5e\u6027\u540d\u79f0<\/h2>\n\n\n\n<p>\u6a21\u677f\u4e2d\u7684 HTML \u5c5e\u6027\u4e0d\u80fd\u5305\u542b\u5927\u5199\u5b57\u7b26\u3002\u5c5e\u6027\u540d\u79f0\u53ef\u4ee5\u4ee5\u4ee5\u4e0b\u5b57\u6bcd\u5f00\u5934\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5c0f\u5199\u5b57\u6bcd\u5b57\u7b26<\/li>\n\n\n\n<li>\u4e0b\u5212\u7ebf \uff08<code>_<\/code>)<\/li>\n\n\n\n<li>\u7f8e\u5143\u7b26\u53f7 \uff08<code>$<\/code>)<\/li>\n\n\n\n<li>\u53ef\u9009\u8fde\u5b57\u7b26\u540e\u8ddf\u5b57\u6bcd\u5b57\u7b26\uff08<code>-a<\/code>)<\/li>\n<\/ul>\n\n\n\n<p>\u5c5e\u6027\u540d\u79f0\u53ef\u4ee5\u5305\u542b\u91cd\u590d\u7684\u4e0b\u5212\u7ebf \uff08\uff09 \u6216\u4e0b\u5212\u7ebf\u540e\u8ddf\u8fde\u5b57\u7b26 \uff08\uff09\u3002<code>__<\/code><code>_-<\/code><\/p>\n\n\n\n<p>\u5982\u679c\u8fde\u5b57\u7b26\u4e0d\u662f\u5c5e\u6027\u540d\u79f0\u4e2d\u7684\u7b2c\u4e00\u4e2a\u5b57\u7b26\uff0c\u5219\u5141\u8bb8\u4f7f\u7528\u8fde\u5b57\u7b26\u540e\u8ddf\u4e0b\u5212\u7ebf \uff08\uff09\u3002\u4f8b\u5982\uff0c\u8fd9\u4e9b\u662f\u6709\u6548\u7684\u5c5e\u6027\u540d\u79f0\uff1a<code>-_<\/code><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>_myattribute<\/code><\/li>\n\n\n\n<li><code>$myattribute<\/code><\/li>\n\n\n\n<li><code>my_-attribute<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u5982\u679c JavaScript \u5c5e\u6027\u4ee5\u5927\u5199\u5b57\u7b26\u5f00\u5934\uff0c\u5e76\u4e14\u5e0c\u671b\u901a\u8fc7 HTML \u5c5e\u6027\u8fdb\u884c\u8bbe\u7f6e\uff0c\u5219\u5fc5\u987b\u4f7f\u7528\u7279\u6b8a\u8bed\u6cd5\u3002\u5c5e\u6027\u540d\u79f0\u7684\u5927\u5199\u5b57\u7b26\u4e3a\u5c0f\u5199\uff0c\u5e76\u4ee5\u8fde\u5b57\u7b26 \u4e3a\u524d\u7f00\u3002\u524d\u5bfc\u8fde\u5b57\u7b26\u544a\u8bc9\u5f15\u64ce\uff0c\u5c5e\u6027\u540d\u79f0\u4e2d\u7684\u7b2c\u4e00\u4e2a\u5b57\u6bcd\u5b57\u7b26\u5728 JavaScript \u7c7b\u4e2d\u662f\u7528\u524d\u5bfc\u5927\u5199\u5b57\u7b26\u58f0\u660e\u7684\u3002\u4f8b\u5982\uff0cJavaScript \u5c5e\u6027\u5bf9\u5e94\u4e8e HTML \u5c5e\u6027\u3002<code>-upper<\/code><code>@api Upper<\/code><code>upper<\/code><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5728 JavaScript \u4e2d\u8bbf\u95ee HTML \u5168\u5c40\u5c5e\u6027<\/h2>\n\n\n\n<p>\u4e0d\u5efa\u8bae\u4f7f\u7528 HTML\u00a0\u5168\u5c40\u5c5e\u6027\uff0c\u8fd9\u4e9b\u5c5e\u6027\u7c7b\u4f3c\u4e8e\u6240\u6709 HTML \u5143\u7d20\uff0c\u5e76\u4e14\u662f\u6240\u6709 HTML \u5143\u7d20\u901a\u7528\u7684\u5c5e\u6027\u3002\u5982\u679c\u786e\u5b9e\u4f7f\u7528\u5168\u5c40 HTML \u5c5e\u6027\uff0c\u8bf7\u4f7f\u7528 .<code>classtitle@api<\/code><\/p>\n\n\n\n<p>\u67d0\u4e9b HTML \u5168\u5c40\u5c5e\u6027\u4e0d\u9075\u5faa Lightning Web \u7ec4\u4ef6\u9a7c\u5cf0\u5927\u5c0f\u5199\u548c\u70e4\u8089\u4e32\u5927\u5c0f\u5199\u7ea6\u5b9a\u3002\u5982\u679c\u5728 JavaScript \u4e2d\u4e3a\u8fd9\u4e9b HTML \u5168\u5c40\u5c5e\u6027\u4e4b\u4e00\u521b\u5efa getter \u6216 setter\uff0c\u8bf7\u4f7f\u7528\u6b64\u5217\u8868\u4e2d\u7684\u5927\u5c0f\u5199\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>HTML \u5168\u5c40\u5c5e\u6027<\/th><th>JavaScript \u4e2d\u7684\u5c5e\u6027<\/th><\/tr><\/thead><tbody><tr><td><code>accesskey<\/code><\/td><td><code>accessKey<\/code><\/td><\/tr><tr><td><code>bgcolor<\/code><\/td><td><code>bgColor<\/code><\/td><\/tr><tr><td><code>colspan<\/code><\/td><td><code>colSpan<\/code><\/td><\/tr><tr><td><code>contenteditable<\/code><\/td><td><code>contentEditable<\/code><\/td><\/tr><tr><td><code>crossorigin<\/code><\/td><td><code>crossOrigin<\/code><\/td><\/tr><tr><td><code>datetime<\/code><\/td><td><code>dateTime<\/code><\/td><\/tr><tr><td><code>for<\/code><\/td><td><code>htmlFor<\/code><\/td><\/tr><tr><td><code>formaction<\/code><\/td><td><code>formAction<\/code><\/td><\/tr><tr><td><code>ismap<\/code><\/td><td><code>isMap<\/code><\/td><\/tr><tr><td><code>maxlength<\/code><\/td><td><code>maxLength<\/code><\/td><\/tr><tr><td><code>minlength<\/code><\/td><td><code>minLength<\/code><\/td><\/tr><tr><td><code>novalidate<\/code><\/td><td><code>noValidate<\/code><\/td><\/tr><tr><td><code>readonly<\/code><\/td><td><code>readOnly<\/code><\/td><\/tr><tr><td><code>rowspan<\/code><\/td><td><code>rowSpan<\/code><\/td><\/tr><tr><td><code>tabindex<\/code><\/td><td><code>tabIndex<\/code><\/td><\/tr><tr><td><code>usemap<\/code><\/td><td><code>useMap<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u4f8b\u5982\uff0c\u8981\u8bbf\u95ee JavaScript \u4e2d\u7684 HTML \u5c5e\u6027\uff0c\u8bf7\u4f7f\u7528 .<code>maxlength<\/code><code>textarea<\/code><code>maxLength<\/code><\/p>\n\n\n\n<p>\u6b64\u5916\uff0c\u8981\u4ece JavaScript \u8bbf\u95ee HTML \u5c5e\u6027\uff0c\u8bf7\u4f7f\u7528 .<code>for<\/code><code>htmlFor<\/code><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5728 JavaScript \u4e2d\u8bbf\u95ee ARIA \u5c5e\u6027<\/h2>\n\n\n\n<p>ARIA \u5c5e\u6027\u652f\u6301\u8f85\u52a9\u6280\u672f\u3002\u8981\u5728 JavaScript \u4e2d\u8bbf\u95ee\u8fd9\u4e9b\u5c5e\u6027\uff0c\u8bf7\u4f7f\u7528\u9a7c\u5cf0\u5927\u5c0f\u5199\u3002\u4f8b\u5982\uff0c\u8981\u8bbf\u95ee \uff0c\u8bf7\u4f7f\u7528 .\u8981\u8bbf\u95ee \uff0c\u8bf7\u4f7f\u7528 .<code>aria-checked<\/code><code>ariaChecked<\/code><code>aria-errormessage<\/code><code>ariaErrorMessage<\/code><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"web-api-properties\">Web API \u5c5e\u6027<\/h2>\n\n\n\n<p>Lightning Web \u7ec4\u4ef6\u53cd\u6620\u4e86\u8bb8\u591a Web API \u7684\u5c5e\u6027\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5143\u7d20<\/h2>\n\n\n\n<p>Lightning Web \u7ec4\u4ef6\u53cd\u6620\u4e86\u00a0<code>Element<\/code>\u00a0\u754c\u9762\u7684\u8fd9\u4e9b\u5c5e\u6027\u3002<\/p>\n\n\n\n<p><code>children<\/code>,\u00a0<code>classList<\/code>,\u00a0<code>className<\/code>,\u00a0<code>firstElementChild<\/code>,\u00a0<code>getAttribute<\/code>,\u00a0<code>getAttributeNS<\/code>,\u00a0<code>getBoundingClientRect<\/code>,\u00a0<code>getElementsByClassName<\/code>,\u00a0<code>getElementsByTagName<\/code>,\u00a0<code>hasAttribute<\/code>,\u00a0<code>id<\/code>,\u00a0<code>lastElementChild<\/code>,\u00a0<code>querySelector<\/code>,\u00a0<code>querySelectorAll<\/code>,\u00a0<code>removeAttribute<\/code>,\u00a0<code>removeAttributeNS<\/code>,\u00a0<code>setAttributeNS<\/code>,\u00a0<code>setAttribute<\/code>,\u00a0<code>shadowRoot<\/code>,\u00a0<code>slot<\/code><\/p>\n\n\n\n<p>\u8bf7\u53c2\u9605\u00a0Shadow DOM\u3001\u8bbf\u95ee\u7ec4\u4ef6\u62e5\u6709\u7684\u5143\u7d20\u4ee5\u53ca\u5c06\u6807\u8bb0\u4f20\u9012\u5230\u63d2\u69fd\u4e2d\u3002<\/p>\n\n\n\n<p>\u5728 Salesforce \u7ec4\u7ec7\u4e2d\u542f\u7528 Lightning Web Security \u540e\uff0csetAttributeNS\u3001setAttribute\u00a0\u548c\u00a0shadowRoot\u00a0\u4f1a\u56e0\u5931\u771f\u800c\u4fee\u6539\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8b\u4ef6\u76ee\u6807<\/h2>\n\n\n\n<p>Lightning Web \u7ec4\u4ef6\u53cd\u6620\u4e86\u00a0<code>EventTarget<\/code>\u00a0\u63a5\u53e3\u7684\u8fd9\u4e9b\u5c5e\u6027\u3002<\/p>\n\n\n\n<p><code>addEventListener<\/code>,\u00a0<code>dispatchEvent<\/code>,\u00a0<code>removeEventListener<\/code><\/p>\n\n\n\n<p>\u8bf7\u53c2\u9605\u4e0e\u4e8b\u4ef6\u901a\u4fe1\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">HTMLElement<\/h2>\n\n\n\n<p>Lightning Web \u7ec4\u4ef6\u53cd\u6620\u4e86\u00a0<code>HTMLElement<\/code>\u00a0\u63a5\u53e3\u7684\u8fd9\u4e9b\u5c5e\u6027\u3002<\/p>\n\n\n\n<p><code>accessKeyLabel<\/code>,\u00a0<code>contentEditable<\/code>,\u00a0<code>dataset<\/code>,\u00a0<code>dir<\/code>,\u00a0<code>hidden<\/code>,\u00a0<code>isContentEditable<\/code>,\u00a0<code>lang<\/code>,\u00a0<code>offsetHeight<\/code>,\u00a0<code>offsetLeft<\/code>,\u00a0<code>offsetParent<\/code>,\u00a0<code>offsetTop<\/code>,\u00a0<code>offsetWidth<\/code>,\u00a0<code>title<\/code><\/p>\n\n\n\n<p>\u5728 Salesforce \u7ec4\u7ec7\u4e2d\u542f\u7528 Lightning Web Security \u65f6\uff0c\u6570\u636e\u96c6\u4f1a\u56e0\u5931\u771f\u800c\u4fee\u6539\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u8282\u70b9<\/h2>\n\n\n\n<p>Lightning Web \u7ec4\u4ef6\u53cd\u6620\u4e86\u00a0<code>Node<\/code>\u00a0\u754c\u9762\u7684\u8fd9\u4e9b\u5c5e\u6027\u3002<\/p>\n\n\n\n<p><code>childNodes<\/code>,\u00a0<code>firstChild<\/code>,\u00a0<code>isConnected<\/code>,\u00a0<code>lastChild<\/code><\/p>\n\n\n\n<p>\u8bf7\u53c2\u89c1\u5728\u00a0DOM \u4e2d\u63d2\u5165\u6216\u5220\u9664\u7ec4\u4ef6\u65f6\u8fd0\u884c\u4ee3\u7801\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">WAI-ARIA \u72b6\u6001\u548c\u5c5e\u6027<\/h2>\n\n\n\n<p>Lightning Web \u7ec4\u4ef6\u53cd\u6620\u4e86\u8fd9\u4e9b\u00a0WAI-ARIA \u72b6\u6001\u548c\u5c5e\u6027\u3002<\/p>\n\n\n\n<p><code>ariaActiveDescendant<\/code>,\u00a0<code>ariaAtomic<\/code>,\u00a0<code>ariaAutoComplete<\/code>,\u00a0<code>ariaBusy<\/code>,\u00a0<code>ariaChecked<\/code>,\u00a0<code>ariaColCount<\/code>,\u00a0<code>ariaColIndex<\/code>,\u00a0<code>ariaColSpan<\/code>,\u00a0<code>ariaControls<\/code>,\u00a0<code>ariaCurrent<\/code>,\u00a0<code>ariaDescribedBy<\/code>,\u00a0<code>ariaDetails<\/code>,\u00a0<code>ariaDisabled<\/code>,\u00a0<code>ariaErrorMessage<\/code>,\u00a0<code>ariaExpanded<\/code>,\u00a0<code>ariaFlowTo<\/code>,\u00a0<code>ariaHasPopup<\/code>,\u00a0<code>ariaHidden<\/code>,\u00a0<code>ariaInvalid<\/code>,\u00a0<code>ariaKeyShortcuts<\/code>,\u00a0<code>ariaLabel<\/code>,\u00a0<code>ariaLabelledBy<\/code>,\u00a0<code>ariaLevel<\/code>,\u00a0<code>ariaLive<\/code>,\u00a0<code>ariaModal<\/code>,\u00a0<code>ariaMultiLine<\/code>,\u00a0<code>ariaMultiSelectable<\/code>,\u00a0<code>ariaOrientation<\/code>,\u00a0<code>ariaOwns<\/code>,\u00a0<code>ariaPlaceholder<\/code>,\u00a0<code>ariaPosInSet<\/code>,\u00a0<code>ariaPressed<\/code>,\u00a0<code>ariaReadOnly<\/code>,\u00a0<code>ariaRelevant<\/code>,\u00a0<code>ariaRequired<\/code>,\u00a0<code>ariaRoleDescription<\/code>,\u00a0<code>ariaRowCount<\/code>,\u00a0<code>ariaRowIndex<\/code>,\u00a0<code>ariaRowSpan<\/code>,\u00a0<code>ariaSelected<\/code>,\u00a0<code>ariaSetSize<\/code>,\u00a0<code>ariaSort<\/code>,\u00a0<code>ariaValueMax<\/code>,\u00a0<code>ariaValueMin<\/code>,\u00a0<code>ariaValueNow<\/code>,\u00a0<code>ariaValueText<\/code><\/p>\n\n\n\n<p>\u8bf7\u53c2\u9605\u7ec4\u4ef6\u53ef\u8bbf\u95ee\u6027\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"use-getters-and-setters-to-modify-data\">\u4f7f\u7528 getter \u548c setter \u4fee\u6539\u6570\u636e<\/h2>\n\n\n\n<p>\u82e5\u8981\u5728\u6bcf\u6b21\u8bbe\u7f6e\u516c\u5171\u5c5e\u6027\u65f6\u6267\u884c\u903b\u8f91\uff0c\u8bf7\u7f16\u5199\u81ea\u5b9a\u4e49 setter\u3002<\/p>\n\n\n\n<p>\u5982\u679c\u4e3a\u516c\u5171\u5c5e\u6027\u7f16\u5199 setter\uff0c\u5219\u8fd8\u5fc5\u987b\u7f16\u5199 getter\u3002\u7528 \u6ce8\u91ca getter \u6216 setter\uff0c\u4f46\u4e0d\u80fd\u540c\u65f6\u6ce8\u91ca\u4e24\u8005\u3002\u6700\u4f73\u505a\u6cd5\u662f\u6ce8\u91ca getter\u3002<code>@api<\/code><\/p>\n\n\n\n<p>\u82e5\u8981\u5c06\u5c5e\u6027\u503c\u4fdd\u5b58\u5728 getter \u548c setter \u4e2d\uff0c\u8bf7\u4f7f\u7528\u5b57\u6bb5\u3002\u6b64\u793a\u4f8b\u4f7f\u7528\u8be5\u5c5e\u6027\uff0c\u8be5\u5c5e\u6027\u4ee5\u4e0b\u5212\u7ebf\u4e3a\u524d\u7f00\uff0c\u4ee5\u6307\u793a\u8be5\u5c5e\u6027\u662f\u79c1\u6709\u7684\u3002<code>_uppercaseItemName<\/code><\/p>\n\n\n\n<p>\u6b64\u793a\u4f8b\u7ec4\u4ef6\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5927\u5199\u3002<code>&lt;c-todo-item&gt;<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- todoItem.html --&gt;\n&lt;template&gt; {itemName} &lt;\/template&gt;<\/code><\/pre>\n\n\n\n<p>\u5c5e\u6027\u503c\u901a\u8fc7 getter \u63d0\u4f9b\u7ed9\u6a21\u677f\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ todoItem.js\nimport { LightningElement, api } from \"lwc\";\nexport default class TodoItem extends LightningElement {\n  _uppercaseItemName;\n\n  @api\n  get itemName() {\n    return this._uppercaseItemName;\n  }\n\n  set itemName(value) {\n    this._uppercaseItemName = value.toUpperCase();\n  }\n}<\/code><\/pre>\n\n\n\n<p>\u63d0\u793a<\/p>\n\n\n\n<p>\u6709\u5173\u4f7f\u7528 getter \u548c setter \u7684\u53e6\u4e00\u4e2a\u793a\u4f8b\uff0c\u8bf7\u53c2\u9605\u00a0lwc-recipes \u793a\u4f8b\u5b58\u50a8\u5e93\u4e2d\u7684 \u548c \u7ec4\u4ef6\u3002<code>apiSetterGettertodoList<\/code><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"boolean-properties\">Boolean \u5c5e\u6027<\/h2>\n\n\n\n<p>\u6807\u51c6 HTML \u5143\u7d20\u4e0a\u7684\u5e03\u5c14\u5c5e\u6027\u662f\u901a\u8fc7\u5c06\u5c5e\u6027\u6dfb\u52a0\u5230\u5143\u7d20\u6765\u8bbe\u7f6e\u7684\u3002\u5982\u679c\u7f3a\u5c11\u8be5\u5c5e\u6027\uff0c\u5219\u8be5\u5c5e\u6027\u9ed8\u8ba4\u4e3a \u3002\u56e0\u6b64\uff0c\u5c5e\u6027\u7684\u9ed8\u8ba4\u503c\u59cb\u7ec8\u4e3a \u3002Lightning Web \u7ec4\u4ef6\u5bf9\u5e03\u5c14\u5c5e\u6027\u4f7f\u7528\u76f8\u540c\u7684\u539f\u5219\u3002<code>true<\/code><code>false<\/code><code>false<\/code><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u9759\u6001\u8bbe\u7f6e\u5c5e\u6027<\/h2>\n\n\n\n<p>\u59cb\u7ec8\u5c06\u5e03\u5c14\u516c\u5171\u5c5e\u6027\u7684\u9ed8\u8ba4\u503c\u8bbe\u7f6e\u4e3a \u3002\u5982\u679c\u5c06\u9ed8\u8ba4\u503c\u8bbe\u7f6e\u4e3a instead in \uff0c\u5219\u65e0\u6cd5\u9759\u6001\u5730\u5c06\u503c\u5207\u6362\u4e3a in markup\u3002<code>false<\/code><code>true<\/code><code>bool.js<\/code><code>false<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ bool.js\nimport { LightningElement, api } from \"lwc\";\n\nexport default class Bool extends LightningElement {\n  @api show = false;\n}<\/code><\/pre>\n\n\n\n<p>\u4e0b\u9762\u662f HTML \u6587\u4ef6\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- bool.html --&gt;\n&lt;template&gt;\n  &lt;p&gt;show value: {show}&lt;\/p&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<p>\u7236\u7ec4\u4ef6\u5305\u62ec \uff0c\u5b83\u663e\u793a\u9ed8\u8ba4\u503c \uff0c\u56e0\u4e3a\u8be5\u5c5e\u6027\u672a\u6dfb\u52a0\u5230 \u3002<code>c-bool<\/code><code>false<\/code><code>show<\/code><code>&lt;c-bool&gt;<\/code><\/p>\n\n\n\n<p>\u91cd\u8981<\/p>\n\n\n\n<p>\u5728\u6807\u8bb0\u4e2d\u6307\u5b9a\u7684\u552f\u4e00\u65b9\u6cd5\u662f\u7701\u7565 boolean \u5c5e\u6027\u3002\u5728\u6807\u8bb0\u4e2d\u8bbe\u7f6e\u7684\u8ba1\u7b97\u7ed3\u679c\u4e3a \u3002<code>false<\/code><code>show=\"false\"<\/code><code>true<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- parent.html --&gt;\n&lt;template&gt;\n  &lt;c-bool&gt;&lt;\/c-bool&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<p>\u82e5\u8981\u5c06\u5c5e\u6027\u8bbe\u7f6e\u4e3a \uff0c\u8bf7\u5c06\u5177\u6709\u7a7a\u503c\u7684\u5c5e\u6027\u6dfb\u52a0\u5230\u6807\u8bb0\u4e2d\u3002\u6b64\u7248\u672c\u7684 \u663e\u793a\u5c5e\u6027\u7684\u503c\u3002<code>show<\/code><code>true<\/code><code>show<\/code><code>c-parent<\/code><code>true<\/code><code>show<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- parent.html --&gt;\n&lt;template&gt;\n  &lt;c-bool show&gt;&lt;\/c-bool&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<p>\u7684\u503c\u662f\uff0c\u4f46\u5c5e\u6027\u4e0d\u4f1a\u53cd\u6620\u5728\u5448\u73b0\u7684 HTML \u4e2d\uff0c\u9664\u975e\u60a8\u901a\u8fc7\u8c03\u7528 \u6765\u663e\u5f0f\u53cd\u6620\u8be5\u5c5e\u6027\u3002\u8bf7\u53c2\u9605\u5c06 JavaScript \u5c5e\u6027\u53cd\u6620\u4e3a HTML \u5c5e\u6027\u3002<code>showtrueshowsetAttribute<\/code><\/p>\n\n\n\n<p>\u6ce8\u610f<\/p>\n\n\n\n<p>\u5f53\u5e03\u5c14\u5c5e\u6027\u7684\u503c\u4e3a \u65f6\uff0c\u5448\u73b0\u7684 HTML \u4e3a \u3002<code>true<\/code><code>&lt;my-component my-attribute&gt;<\/code><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u52a8\u6001\u8bbe\u7f6e\u5c5e\u6027<\/h2>\n\n\n\n<p>\u82e5\u8981\u52a8\u6001\u5207\u6362\u503c\uff0c\u8bf7\u4ece\u7236\u7ec4\u4ef6\u4f20\u9012\u52a8\u6001\u8ba1\u7b97\u503c\u3002\u4f8b\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- parent.html --&gt;\n&lt;template&gt;\n  &lt;c-bool show={computedValue}&gt;&lt;\/c-bool&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<p>\u4f7f\u7528 JavaScript getter in \u8fd4\u56de \u7684\u503c\u3002<code>parent.js<\/code><code>{computedValue}<\/code><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"reflect-javascript-properties-to-html-attributes\">\u5c06 JavaScript \u5c5e\u6027\u53cd\u6620\u4e3a HTML \u5c5e\u6027<\/h2>\n\n\n\n<p>\u60a8\u53ef\u4ee5\u63a7\u5236\u516c\u5171 JavaScript \u5c5e\u6027\u662f\u5426\u5728 Lightning Web \u7ec4\u4ef6\u7684\u6e32\u67d3 HTML \u4e2d\u663e\u793a\u4e3a\u5c5e\u6027\u3002\u5728\u521b\u5efa\u53ef\u8bbf\u95ee\u7684\u7ec4\u4ef6\u65f6\uff0c\u5141\u8bb8\u5c5e\u6027\u663e\u793a\u4e3a\u5c5e\u6027\u5c24\u4e3a\u91cd\u8981\uff0c\u56e0\u4e3a\u5c4f\u5e55\u9605\u8bfb\u5668\u548c\u5176\u4ed6\u8f85\u52a9\u6280\u672f\u4f7f\u7528 HTML \u5c5e\u6027\u3002<\/p>\n\n\n\n<p>\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u6240\u6709 HTML \u5c5e\u6027\u90fd\u662f\u54cd\u5e94\u5f0f\u7684\u3002\u5f53\u7ec4\u4ef6 HTML \u4e2d\u7684\u5c5e\u6027\u503c\u53d1\u751f\u66f4\u6539\u65f6\uff0c\u5c06\u91cd\u65b0\u5448\u73b0\u8be5\u7ec4\u4ef6\u3002<\/p>\n\n\n\n<p>\u5f53\u60a8\u901a\u8fc7\u5c06\u67d0\u4e2a\u5c5e\u6027\u516c\u5f00\u4e3a\u516c\u5171\u5c5e\u6027\u6765\u63a7\u5236\u8be5\u5c5e\u6027\u65f6\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u8be5\u5c5e\u6027\u5c06\u4e0d\u518d\u663e\u793a\u5728 HTML \u8f93\u51fa\u4e2d\u3002\u82e5\u8981\u5c06\u503c\u4f5c\u4e3a\u5c5e\u6027\u4f20\u9012\u5230\u5448\u73b0\u7684 HTML\uff08\u4ee5\u53cd\u6620\u5c5e\u6027\uff09\uff0c\u8bf7\u4e3a\u5c5e\u6027\u5b9a\u4e49 getter \u548c setter \u5e76\u8c03\u7528\u8be5\u65b9\u6cd5\u3002<code>setAttribute()<\/code><\/p>\n\n\n\n<p>\u60a8\u8fd8\u53ef\u4ee5\u5728 setter \u4e2d\u6267\u884c\u64cd\u4f5c\u3002\u4f7f\u7528\u5b57\u6bb5\u4fdd\u5b58\u8ba1\u7b97\u503c\u3002<\/p>\n\n\n\n<p>\u6b64\u793a\u4f8b\u516c\u5f00\u4e3a\u516c\u5171\u5c5e\u6027\u3002\u5b83\u5c06\u6807\u9898\u8f6c\u6362\u4e3a\u5927\u5199\uff0c\u5e76\u4f7f\u7528\u8be5\u5c5e\u6027\u6765\u4fdd\u5b58\u6807\u9898\u7684\u8ba1\u7b97\u503c\u3002setter \u8c03\u7528\u4ee5\u5c06\u5c5e\u6027\u7684\u503c\u53cd\u6620\u5230 HTML \u5c5e\u6027\u3002<code>title<\/code><code>_privateTitle<\/code><code>setAttribute()<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ myComponent.js\nimport { LightningElement, api } from \"lwc\";\n\nexport default class MyComponent extends LightningElement {\n  _privateTitle;\n\n  @api\n  get title() {\n    return this._privateTitle;\n  }\n\n  set title(value) {\n    this._privateTitle = value.toUpperCase();\n    this.setAttribute(\"title\", this._privateTitle);\n  }\n}<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\/* parent.html *\/\n&lt;template&gt;\n  &lt;c-my-component title=\"Hover Over the Component to See Me\"&gt;&lt;\/c-my-component&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\/* Generated HTML *\/\n&lt;c-my-component title=\"HOVER OVER THE COMPONENT TO SEE ME\"&gt;\n  &lt;div&gt;Reflecting Attributes Example&lt;\/div&gt;\n&lt;\/c-my-component&gt;<\/code><\/pre>\n\n\n\n<p>\u8981\u786e\u4fdd\u60a8\u4e86\u89e3 JavaScript \u5c5e\u6027\u5982\u4f55\u53cd\u6620\u5230 HTML \u5c5e\u6027\uff0c\u8bf7\u67e5\u770b\u4e0d\u8c03\u7528 .\u751f\u6210\u7684 HTML \u4e0d\u5305\u542b\u8be5\u5c5e\u6027\u3002<code>setAttribute()<\/code><code>title<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ myComponent.js\nimport { LightningElement, api } from \"lwc\";\n\nexport default class MyComponent extends LightningElement {\n  _privateTitle;\n\n  @api\n  get title() {\n    return this._privateTitle;\n  }\n\n  set title(value) {\n    this._privateTitle = value.toUpperCase();\n    \/\/ this.setAttribute('title', this._privateTitle);\n  }\n}<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\/* parent.html *\/\n&lt;template&gt;\n  &lt;c-my-component title=\"Hover Over the Component to See Me\"&gt;&lt;\/c-my-component&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\/* Generated HTML *\/\n&lt;c-my-component&gt;\n  &lt;div&gt;Reflecting Attributes Example&lt;\/div&gt;\n&lt;\/c-my-component&gt;<\/code><\/pre>\n\n\n\n<p>\u5728\u8bbe\u7f6e\u503c\u4e4b\u524d\uff0c\u8bf7\u68c0\u67e5\u4f7f\u7528\u8005\u662f\u5426\u5df2\u7ecf\u8bbe\u7f6e\u4e86\u8be5\u503c\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ myComponent.js\nimport { LightningElement } from \"lwc\";\n\nexport default class MyComponent extends LightningElement {\n  connectedCallback() {\n    const tabindex = this.getAttribute(\"tabindex\");\n\n    \/\/ Set the tabindex to 0 if it hasn\u2019t been set by the consumer.\n    if (!tabindex) {\n      this.setAttribute(\"tabindex\", \"0\");\n    }\n  }\n}<\/code><\/pre>\n\n\n\n<p>\u5728\u6b64\u6807\u8bb0\u4e2d\u8bbe\u7f6e using \u7ed3\u679c\u3002<code>tabindex<\/code><code>this.setAttribute()<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;c-my-component tabindex=\"0\"&gt;&lt;\/c-my-component&gt;<\/code><\/pre>\n\n\n\n<p>\u8981\u8bbe\u7f6e\u8fd9\u4e9b\u5c5e\u6027\uff0c\u8bf7\u4f7f\u7528 .<code>setAttribute()<\/code><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>for<\/code><\/li>\n\n\n\n<li><code>aria-activedescendant<\/code><\/li>\n\n\n\n<li><code>aria-controls<\/code><\/li>\n\n\n\n<li><code>aria-describedby<\/code><\/li>\n\n\n\n<li><code>aria-details<\/code><\/li>\n\n\n\n<li><code>aria-errormessage<\/code><\/li>\n\n\n\n<li><code>aria-flowto<\/code><\/li>\n\n\n\n<li><code>aria-labelledby<\/code><\/li>\n\n\n\n<li><code>aria-owns<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u8981\u4ece\u5448\u73b0\u7684 HTML \u4e2d\u9690\u85cf HTML \u5c5e\u6027\uff0c\u8bf7\u8c03\u7528 .<code>removeAttribute()<\/code><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"manage-attribute-dependencies-in-a-getter\">\u7ba1\u7406 Getter \u4e2d\u7684\u5c5e\u6027\u4f9d\u8d56\u5173\u7cfb<\/h2>\n\n\n\n<p>HTML \u4e2d\u7684\u5c5e\u6027\u53d8\u6210\u4e86 JavaScript \u4e2d\u7684\u5c5e\u6027\u8d4b\u503c\u3002\u5728\u8fd9\u4e24\u79cd\u60c5\u51b5\u4e0b\uff0c\u90fd\u4e0d\u80fd\u4fdd\u8bc1\u5206\u914d\u987a\u5e8f\u3002\u8981\u68c0\u67e5\u662f\u5426\u5b58\u5728\u5176\u4ed6\u5c5e\u6027\uff0c\u8bf7\u4f7f\u7528 getter\u3002<\/p>\n\n\n\n<p>\u5728\u6a21\u677f\u4e2d\u4f7f\u7528 getter \u5f15\u7528\u3002\u4e0d\u8981\u4f7f\u7528 getter\uff0c\u4e5f\u4e0d\u8981\u4f7f\u7528\u4f9d\u8d56\u4e8e\u5176\u4ed6\u5c5e\u6027\u4e2d\u7684\u503c\u7684 setter\u3002<code>@api<\/code><code>@api<\/code><code>@api<\/code><\/p>\n\n\n\n<p>\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u6570\u636e\u8868\u7ec4\u4ef6\uff0c\u8be5\u7ec4\u4ef6\u5728\u6240\u9009\u884c\u4e0a\u663e\u793a\u590d\u9009\u6807\u8bb0\u3002\u6211\u4eec\u6709\u4e24\u4e2a\u72ec\u7acb\u7684\u5c5e\u6027\u548c \uff0c\u5b83\u4eec\u4f9d\u8d56\u4e8e\u53e6\u4e00\u4e2a\u5c5e\u6027\u3002<code>rows<\/code><code>selectedRows<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;template&gt;\n  &lt;c-datatable selected-rows=\"1,2\" rows=\"1,2,3,4\"&gt; &lt;\/c-datatable&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<p>\u7531\u4e8e\u65e0\u6cd5\u4fdd\u8bc1\u63a5\u6536\u5c5e\u6027\u7684\u987a\u5e8f\uff0c\u56e0\u6b64\u8bf7\u4f7f\u7528 getter \u6765\u68c0\u67e5\u4f9d\u8d56\u5173\u7cfb\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>export default class Datatable extends LightningElement {\n  @track state = {};\n\n  @api\n  get rows() {\n    return this.state.rows;\n  }\n\n  set rows(value) {\n    this.state.rows = value;\n\n    \/\/ Check to see if the rows have\n    \/\/ been marked as selected.\n    if (this.state.selectedRows &amp;&amp; !this.selectedRowsSet) {\n      this.markSelectedRows();\n      this.selectedRowsSet = true;\n    }\n  }\n\n  @api\n  set selectedRows(value) {\n    this.state.selectedRows = value;\n\n    \/\/ If rows haven\u2019t been set,\n    \/\/ then we can't mark anything\n    \/\/ as selected.\n    if (!this.state.rows) {\n      this.selectedRowsSet = false;\n      return;\n    }\n\n    this.markSelectedRows();\n  }\n\n  get selectedRows() {\n    return this.state.selectedRows;\n  }\n\n  markSelectedRows() {\n    \/\/ Mark selected rows.\n  }\n}<\/code><\/pre>\n\n\n\n<p>\u4f7f\u7528 getter \u548c setter \u53ef\u786e\u4fdd\u516c\u5171 API \u534f\u5b9a\u6613\u4e8e\u6267\u884c\u3002\u7ec4\u4ef6\u4e0d\u5e94\u66f4\u6539\u7528 \u6279\u6ce8\u7684\u5c5e\u6027\u7684\u503c\u3002<code>@api<\/code><\/p>\n\n\n\n<p>\u5982\u679c\u67d0\u4e9b\u5185\u5bb9\u5728\u8bbe\u5b9a\u7684\u65f6\u95f4\u4f9d\u8d56\u4e8e\u8be5\u503c\uff0c\u5219\u89c4\u8303\u5316 setter \u4e2d\u7684\u6570\u636e\uff0c\u4f8b\u5982\uff0c\u4ee5\u7f16\u7a0b\u65b9\u5f0f\u5c06 CSS \u7c7b\u9644\u52a0\u5230\u5143\u7d20\u4e0a\u3002\u8fd4\u56de getter \u4e2d\u7684\u539f\u59cb\u503c\u3002\u89c4\u8303\u5316\u4e5f\u53ef\u4ee5\u5728 getter \u4e2d\u5b8c\u6210\uff0c\u8fd9\u6837\u5373\u4f7f\u4f7f\u7528\u8005\u6ca1\u6709\u8bbe\u7f6e\u4efb\u4f55\u5185\u5bb9\uff0c\u6a21\u677f\u4e5f\u53ef\u4ee5\u8bbf\u95ee\u503c\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>@track state = {\n    selected : false\n};\n\nprivateSelected = 'false';\n\n@api\nget selected() {\n    return this.privateSelected;\n}\nset selected(value) {\n    this.privateSelected = value;\n    this.state.selected = normalizeBoolean(value)\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u7ec4\u4ef6\u7684 JavaScript \u7c7b\u4e2d\u58f0\u660e\u5b57\u6bb5\u3002\u5728\u7ec4\u4ef6\u7684\u6a21\u677f\u4e2d\u5f15\u7528\u5b83\u4eec\u4ee5\u52a8\u6001\u66f4\u65b0\u5185\u5bb9\u3002<\/p>\n<p>\u5b57\u6bb5\u548c\u5c5e\u6027\u51e0\u4e4e\u662f\u53ef\u4ee5\u4e92\u6362\u7684\u672f\u8bed\u3002\u7ec4\u4ef6\u4f5c\u8005\u58f0\u660e\u7c7b\u4e2d\u7684\u5b57\u6bb5\u3002\u7c7b\u7684\u5b9e\u4f8b\u5177\u6709\u5c5e\u6027\u3002\u5bf9\u4e8e\u7ec4\u4ef6\u4f7f\u7528\u8005\u6765\u8bf4\uff0c\u5b57\u6bb5\u662f\u5c5e\u6027\u3002\u5728 Lightning Web \u7ec4\u4ef6\u4e2d\uff0c\u53ea\u6709\u7ec4\u4ef6\u4f5c\u8005\u7528\u6765\u4fee\u9970\u7684\u5b57\u6bb5\u624d\u80fd\u4f5c\u4e3a\u5bf9\u8c61\u5c5e\u6027\u516c\u5f00\u63d0\u4f9b\u7ed9\u4f7f\u7528\u8005\u3002@api<\/p>\n<p>\u5c5e\u6027\u548c\u5c5e\u6027\u51e0\u4e4e\u662f\u53ef\u4ee5\u4e92\u6362\u7684\u672f\u8bed\uff0c\u53ef\u80fd\u4f1a\u9020\u6210\u6df7\u6dc6\u3002\u4e00\u822c\u6765\u8bf4\uff0c\u5728 HTML \u4e2d\u6211\u4eec\u8c08\u8bba\u5c5e\u6027\uff0c\u5728 JavaScript \u4e2d\u6211\u4eec\u8c08\u8bba\u5c5e\u6027\u3002<\/p>\n","protected":false},"author":1,"featured_media":3817,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[238],"class_list":["post-3814","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-lightning-web-","tag-238"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u5b57\u6bb5\u3001\u5c5e\u6027\u548c\u7279\u6027 - \u767d\u767d\u968f\u7b14<\/title>\n<meta name=\"description\" content=\"\u5728\u7ec4\u4ef6\u7684 JavaScript \u7c7b\u4e2d\u58f0\u660e\u5b57\u6bb5\u3002\u5728\u7ec4\u4ef6\u7684\u6a21\u677f\u4e2d\u5f15\u7528\u5b83\u4eec\u4ee5\u52a8\u6001\u66f4\u65b0\u5185\u5bb9\u3002\u5b57\u6bb5\u548c\u5c5e\u6027\u51e0\u4e4e\u662f\u53ef\u4ee5\u4e92\u6362\u7684\u672f\u8bed\u3002\u7ec4\u4ef6\u4f5c\u8005\u58f0\u660e\u7c7b\u4e2d\u7684\u5b57\u6bb5\u3002\u7c7b\u7684\u5b9e\u4f8b\u5177\u6709\u5c5e\u6027\u3002\u5bf9\u4e8e\u7ec4\u4ef6\u4f7f\u7528\u8005\u6765\u8bf4\uff0c\u5b57\u6bb5\u662f\u5c5e\u6027\u3002\u5728 Lightning Web \u7ec4\u4ef6\u4e2d\uff0c\u53ea\u6709\u7ec4\u4ef6\u4f5c\u8005\u7528\u6765\u4fee\u9970\u7684\u5b57\u6bb5\u624d\u80fd\u4f5c\u4e3a\u5bf9\u8c61\u5c5e\u6027\u516c\u5f00\u63d0\u4f9b\u7ed9\u4f7f\u7528\u8005\u3002@api\u5c5e\u6027\u548c\u5c5e\u6027\u51e0\u4e4e\u662f\u53ef\u4ee5\u4e92\u6362\u7684\u672f\u8bed\uff0c\u53ef\u80fd\u4f1a\u9020\u6210\u6df7\u6dc6\u3002\u4e00\u822c\u6765\u8bf4\uff0c\u5728 HTML \u4e2d\u6211\u4eec\u8c08\u8bba\u5c5e\u6027\uff0c\u5728 JavaScript \u4e2d\u6211\u4eec\u8c08\u8bba\u5c5e\u6027\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/www.ponybai.com\/?p=3814\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u5b57\u6bb5\u3001\u5c5e\u6027\u548c\u7279\u6027 - \u767d\u767d\u968f\u7b14\" \/>\n<meta property=\"og:description\" content=\"\u5728\u7ec4\u4ef6\u7684 JavaScript \u7c7b\u4e2d\u58f0\u660e\u5b57\u6bb5\u3002\u5728\u7ec4\u4ef6\u7684\u6a21\u677f\u4e2d\u5f15\u7528\u5b83\u4eec\u4ee5\u52a8\u6001\u66f4\u65b0\u5185\u5bb9\u3002\u5b57\u6bb5\u548c\u5c5e\u6027\u51e0\u4e4e\u662f\u53ef\u4ee5\u4e92\u6362\u7684\u672f\u8bed\u3002\u7ec4\u4ef6\u4f5c\u8005\u58f0\u660e\u7c7b\u4e2d\u7684\u5b57\u6bb5\u3002\u7c7b\u7684\u5b9e\u4f8b\u5177\u6709\u5c5e\u6027\u3002\u5bf9\u4e8e\u7ec4\u4ef6\u4f7f\u7528\u8005\u6765\u8bf4\uff0c\u5b57\u6bb5\u662f\u5c5e\u6027\u3002\u5728 Lightning Web \u7ec4\u4ef6\u4e2d\uff0c\u53ea\u6709\u7ec4\u4ef6\u4f5c\u8005\u7528\u6765\u4fee\u9970\u7684\u5b57\u6bb5\u624d\u80fd\u4f5c\u4e3a\u5bf9\u8c61\u5c5e\u6027\u516c\u5f00\u63d0\u4f9b\u7ed9\u4f7f\u7528\u8005\u3002@api\u5c5e\u6027\u548c\u5c5e\u6027\u51e0\u4e4e\u662f\u53ef\u4ee5\u4e92\u6362\u7684\u672f\u8bed\uff0c\u53ef\u80fd\u4f1a\u9020\u6210\u6df7\u6dc6\u3002\u4e00\u822c\u6765\u8bf4\uff0c\u5728 HTML \u4e2d\u6211\u4eec\u8c08\u8bba\u5c5e\u6027\uff0c\u5728 JavaScript 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