{"id":3843,"date":"2024-01-12T14:57:30","date_gmt":"2024-01-12T06:57:30","guid":{"rendered":"http:\/\/www.ponybai.com\/?p=3843"},"modified":"2023-12-02T15:10:03","modified_gmt":"2023-12-02T07:10:03","slug":"%e7%ac%ac%e4%b8%89%e6%96%b9-web-%e7%bb%84%e4%bb%b6","status":"publish","type":"post","link":"http:\/\/www.ponybai.com\/?p=3843","title":{"rendered":"\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\uff08\u6d4b\u8bd5\u7248\uff09"},"content":{"rendered":"\n<p>\u6ce8\u610f<\/p>\n\n\n\n<p>\u6b64\u529f\u80fd\u662f\u4e00\u9879\u6d4b\u8bd5\u7248\u670d\u52a1\u3002\u5ba2\u6237\u53ef\u81ea\u884c\u51b3\u5b9a\u662f\u5426\u8bd5\u7528\u6b64\u7c7b\u6d4b\u8bd5\u7248\u670d\u52a1\u3002\u5bf9\u6d4b\u8bd5\u7248\u670d\u52a1\u7684\u4efb\u4f55\u4f7f\u7528\u5747\u53d7\u534f\u8bae\u548c\u6761\u6b3e\u4e2d\u63d0\u4f9b\u7684\u9002\u7528\u6d4b\u8bd5\u7248\u670d\u52a1\u6761\u6b3e\u7684\u7ea6\u675f\u3002<\/p>\n\n\n\n<p>\u5728 LWC \u4e2d\u4f7f\u7528\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u53ef\u4ee5\u8282\u7701\u5728 LWC 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\u7ec4\u4ef6\u3002<code>lwc:dom=\"manual\"<\/code><code>lwc:external<\/code><\/p>\n\n\n\n<p>\u6ce8\u610f<\/p>\n\n\n\n<p>Salesforce \u4e0d\u63d0\u4f9b\u5bf9\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u7684\u652f\u6301\u3002\u6f14\u793a\u4f7f\u7528\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u7684\u6587\u6863\u548c\u793a\u4f8b\u4e0d\u6784\u6210\u5bf9\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u7684\u8ba4\u53ef\u3002\u6211\u4eec\u5efa\u8bae\u60a8\u67e5\u770b\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u6587\u6863\uff0c\u4e86\u89e3\u4f7f\u7528\u60c5\u51b5\u4fe1\u606f\u3002<\/p>\n\n\n\n<p>\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u53ef\u4ee5\u662f\u5404\u79cd JavaScript \u6846\u67b6\uff0c\u4e5f\u53ef\u4ee5\u662f\u7528\u7eaf vanilla JS \u7f16\u5199\u7684\u6846\u67b6\u3002MDN Web \u7ec4\u4ef6\u662f\u53ef\u4e0e LWC \u6846\u67b6\u4e00\u8d77\u4f7f\u7528\u7684\u7b2c\u4e09\u65b9\u00a0Web \u7ec4\u4ef6\u7684\u793a\u4f8b\u3002\u540c\u6837\uff0cwebcomponents.org\u00a0\u63d0\u4f9b\u4e86\u57fa\u4e8e\u81ea\u5b9a\u4e49\u5143\u7d20\u548c\u5f71\u5b50 DOM \u6807\u51c6\u7684 Web \u7ec4\u4ef6\u7684\u96c6\u5408\u3002<\/p>\n\n\n\n<p>\u5982\u679c\u60a8\u4f7f\u7528\u7684\u662f\u7b2c\u4e09\u65b9 JavaScript \u5e93\uff0c\u8bf7\u53c2\u9605\u6539\u7528\u7b2c\u4e09\u65b9 JavaScript \u5e93\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5b9e\u73b0\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6<\/h2>\n\n\n\n<p>\u5728\u4f7f\u7528\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u4e4b\u524d\uff0c\u6211\u4eec\u5efa\u8bae\u60a8\u68c0\u67e5 AppExchange \u4e2d\u662f\u5426\u6709\u7b2c\u4e09\u65b9 LWC \u5e94\u7528\u7a0b\u5e8f\u6216\u7ec4\u4ef6\uff0c\u5e76\u5b89\u88c5\u5177\u6709\u6240\u9700\u529f\u80fd\u7684\u6258\u7ba1\u8f6f\u4ef6\u5305\u3002\u6216\u8005\uff0c\u68c0\u67e5\u57fa\u672c\u7ec4\u4ef6\u662f\u5426\u9002\u5408\u60a8\u7684\u8981\u6c42\u3002<\/p>\n\n\n\n<p>\u82e5\u8981\u4f7f\u7528\u975e LWC \u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\uff0c\u8bf7\u9075\u5faa\u4ee5\u4e0b\u89e3\u51b3\u65b9\u6848\u4e4b\u4e00\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5c06\u6587\u4ef6\u4f5c\u4e3a\u9759\u6001\u8d44\u6e90\u4e0a\u4f20\uff0c\u5e76\u4f7f\u7528\u6a21\u5757\u4e2d\u7684\u65b9\u6cd5\u52a0\u8f7d\u7ec4\u4ef6\u3002\u6bcf\u4e2a\u9759\u6001\u8d44\u6e90\u6700\u591a\u53ef\u4ee5\u4e0a\u4f20 5 MB\u3002\u4e00\u4e2a\u7ec4\u7ec7\u6700\u591a\u53ef\u4ee5\u6709 250 MB \u7684\u9759\u6001\u8d44\u6e90\u3002<code>loadScript<\/code><code>lightning\/platformResourceLoader<\/code><\/li>\n\n\n\n<li>\u4f7f\u7528\u914d\u7f6e\u6587\u4ef6\u5c06\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u6dfb\u52a0\u4e3a LWC \u6a21\u5757\u3002\u7ec4\u4ef6\u7684 JavaScript \u6587\u4ef6\u7684\u6700\u5927\u6587\u4ef6\u5927\u5c0f\u4e3a 128 KB\u3002<code>.js-meta.xml<\/code><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u5df2\u77e5\u95ee\u9898<\/h2>\n\n\n\n<p>\u6b64\u6d4b\u8bd5\u7248\u5b58\u5728\u51e0\u4e2a\u5df2\u77e5\u95ee\u9898\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528\u5f71\u5b50 DOM \u7684\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u4ec5\u652f\u6301\u5c01\u95ed\u7684\u5f71\u5b50\u6839\u76ee\u5f55\u3002\u5982\u679c\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u4f7f\u7528\u6a21\u5f0f\uff0c\u8bf7\u66f4\u65b0\u6e90\u4ee5\u4f7f\u7ec4\u4ef6\u7b26\u5408 LWS\u3002\u6216\u8005\uff0c\u4f7f\u7528\u4e0d\u4f7f\u7528\u5f71\u5b50 DOM \u7684\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u3002\u8bf7\u53c2\u89c1\u00a0Light DOM\u3002<code>attachShadow({ mode: \"closed\" });open<\/code><\/li>\n\n\n\n<li><code>loadScript<\/code>\u76ee\u524d\u4e0d\u652f\u6301\u00a0ECMAScript \u6a21\u5757 \uff08ESM\uff09\u3002\u4f8b\u5982\uff0c\u4e0d\u652f\u6301\u3002\u4f7f\u7528\u9884\u6346\u7ed1\u7684 JavaScript \u6587\u4ef6\u548c\u4f20\u7edf\u683c\u5f0f\uff08\u5982\u00a0IIFE\uff08\u7acb\u5373\u8c03\u7528\u7684\u51fd\u6570\u8868\u8fbe\u5f0f\uff09\u6216\u00a0UMD\uff08\u901a\u7528\u6a21\u5757\u5b9a\u4e49\uff09\uff09\u7b49\u81ea\u5b9a\u4e49\u5143\u7d20\u5bfc\u5165\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u3002<code>&lt;script type=\"module\"><\/code><\/li>\n\n\n\n<li>\u4e0d\u652f\u6301\u5177\u6709 npm \u548c\u5176\u4ed6\u4f9d\u8d56\u9879\u7684\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\uff0c\u6216\u8005\u9700\u8981\u7f16\u8bd1\u548c\u6346\u7ed1\u7684\u7ec4\u4ef6\u3002LWC \u76ee\u524d\u4e0d\u652f\u6301\u4ece npm \u5bfc\u5165\u3002<\/li>\n\n\n\n<li>\u5f71\u5b50 DOM \u4e0d\u652f\u6301\u6309 ID \u5f15\u7528\u5143\u7d20\u7684\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u3002\u4f8b\u5982\uff0c\u5982\u679c\u7ec4\u4ef6\u4f7f\u7528 \uff0cLWC \u65e0\u6cd5\u8bbf\u95ee\u5168\u5c40 HTML \u6587\u6863\u3002\u5c3d\u53ef\u80fd\u4f7f\u7528\u6a21\u677f\u5f15\u7528\u3002<code>document.getElementById('some-id')<\/code><\/li>\n\n\n\n<li>\u542f\u7528 LWS \u540e\uff0cExperience Builder \u7ad9\u70b9\u5f53\u524d\u4e0d\u652f\u6301\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u3002<\/li>\n\n\n\n<li>Lightning Web Security \u76ee\u524d\u4e0d\u652f\u6301\u4f7f\u7528\u8be5\u9009\u9879\u81ea\u5b9a\u4e49\u5185\u7f6e\u5143\u7d20\u3002\u81ea\u5b9a\u4e49\u7684\u5185\u7f6e\u5143\u7d20\u5728\u00a0Safari \u7b49 WebKit \u6d4f\u89c8\u5668\u4e2d\u4e5f\u4e0d\u53d7\u652f\u6301\u3002\u82e5\u8981\u8be6\u7ec6\u4e86\u89e3\u5728\u6269\u5c55\u7c7b\u4e2d\u53ef\u4ee5\u6267\u884c\u7684\u64cd\u4f5c\uff0c\u8bf7\u53c2\u9605\u00a0HTML \u89c4\u8303\uff1a\u81ea\u5b9a\u4e49\u5143\u7d20\u3002<code>extendsHTMLElement<\/code><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f7f\u7528\u6307\u5357<\/h2>\n\n\n\n<p>\u4f7f\u7528\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u65f6\uff0c\u8bf7\u9075\u5faa\u4ee5\u4e0b\u51c6\u5219\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528\u7279\u6027\u3001\u5c5e\u6027\u6216\u6307\u4ee4\u5c06\u6570\u636e\u4f20\u9012\u5230\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u3002\u5c06\u6570\u636e\u4f20\u9012\u7ed9 Web \u7ec4\u4ef6\u65f6\uff0cLWC \u9ed8\u8ba4\u5c06\u6570\u636e\u8bbe\u7f6e\u4e3a\u5c5e\u6027\uff0c\u5e76\u4e14\u4ec5\u5f53\u5c5e\u6027\u5b58\u5728\u65f6\u624d\u8bbe\u7f6e\u5c5e\u6027\u3002<code>lwc:spread<\/code><\/li>\n\n\n\n<li>\u5c06\u6807\u8bb0\u4f20\u9012\u5230\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u4e2d\u7684\u63d2\u69fd\uff0c\u7c7b\u4f3c\u4e8e\u5c06\u6807\u8bb0\u4f20\u9012\u5230 Lightning Web \u7ec4\u4ef6\u4e2d\u7684\u63d2\u69fd\u3002\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u4e0d\u652f\u6301\u5408\u6210\u9634\u5f71\u7684\u69fd\u4f4d\u3002<\/li>\n\n\n\n<li>LWC \u6a21\u677f\u4ec5\u652f\u6301\u6839\u6807\u8bb0\u3002\u5982\u679c\u7b2c\u4e09\u65b9\u7ec4\u4ef6\u9700\u8981\u5d4c\u5957\u6807\u8bb0\uff0c\u8bf7\u6539\u7528 JavaScript \u6587\u4ef6\u3002<code>&lt;template&gt;<\/code><code>&lt;template&gt;<\/code><code>document.createElement('template')<\/code><\/li>\n\n\n\n<li>LWC \u6a21\u677f\u4e2d\u7684\u58f0\u660e\u6027\u4e8b\u4ef6\u7ed1\u5b9a\u53ea\u80fd\u4f7f\u7528\u5c0f\u5199\u4e8b\u4ef6\u540d\u79f0\u3002\u5982\u679c\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u5728\u4e8b\u4ef6\u540d\u79f0\u4e2d\u4f7f\u7528\u975e\u5c0f\u5199\u5b57\u7b26\u6216\u8fde\u5b57\u7b26\uff0c\u8bf7\u4f7f\u7528 \u4ee5\u7f16\u7a0b\u65b9\u5f0f\u6dfb\u52a0\u4e8b\u4ef6\u4fa6\u542c\u5668\u3002<code>addEventListener()<\/code><\/li>\n\n\n\n<li>\u4f7f\u7528 \u548c \u5448\u73b0\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u540e\u89c2\u5bdf\u5c5e\u6027\u66f4\u6539\u3002<code>observedAttributes()<\/code><code>attributeChangedCallback()<\/code><\/li>\n\n\n\n<li><code>lwc:external<\/code>\u4e0d\u652f\u6301\u52a8\u6001\u7ec4\u4ef6\u521b\u5efa\u3002\u81ea\u5b9a\u4e49\u5143\u7d20\u7684\u5448\u73b0\u65b9\u5f0f\u7c7b\u4f3c\u4e8e Lightning Web \u7ec4\u4ef6\u548c\u539f\u751f HTML \u5143\u7d20\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u6709\u5173\u8be6\u7ec6\u4fe1\u606f\uff0c\u8bf7\u53c2\u9605\u5c06\u6570\u636e\u4f20\u9012\u5230\u81ea\u5b9a\u4e49\u5143\u7d20 \uff08Beta\uff09\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u793a\u4f8b\uff1a\u5c06 Web \u7ec4\u4ef6\u4f5c\u4e3a\u9759\u6001\u8d44\u6e90\u4e0a\u8f7d<\/h2>\n\n\n\n<p>\u6b64\u793a\u4f8b\u4e2d\u7684\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u7c7b\u4f3c\u4e8e\u00a0<code>lightning-relative-date-time<\/code>\u00a0\u57fa\u672c\u7ec4\u4ef6\u3002\u5728\u4f7f\u7528\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u4e4b\u524d\uff0c\u8bf7\u68c0\u67e5\u57fa\u672c\u7ec4\u4ef6\u662f\u5426\u6ee1\u8db3\u60a8\u7684\u8981\u6c42\u3002<\/p>\n\n\n\n<p>\u6b64\u793a\u4f8b\u4f7f\u7528\u00a0<code>time-elements<\/code>\u00a0JavaScript \u6587\u4ef6\uff0c\u8be5\u6587\u4ef6\u53ef\u7528\u4f5c IIFE\u3002<\/p>\n\n\n\n<p><code>time-elements<\/code>\u63d0\u4f9b\u4e86\u591a\u4e2a Web \u7ec4\u4ef6 &#8211; \u3001 \u3001 \u548c \u3002<code>local-time<\/code><code>relative-time<\/code><code>time-ago<\/code><code>time-until<\/code><\/p>\n\n\n\n<p>\u5728\u4f7f\u7528\u8fd9\u4e9b Web \u7ec4\u4ef6\u4e4b\u524d\uff0c\u8bf7\u5c06 JavaScript \u6587\u4ef6\u4f5c\u4e3a\u9759\u6001\u8d44\u6e90\u4e0a\u4f20\u5230\u7ec4\u7ec7\u4e2d\u3002\u5728\u6b64\u793a\u4f8b\u4e2d\uff0c\u9759\u6001\u8d44\u6e90\u7684\u540d\u79f0\u4e3a \u3002<code>timeElements<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!--externalExample.html--&gt;\n&lt;template&gt;\n  &lt;p&gt;\n    Relative time (auto-updated every minute):\n    &lt;relative-time datetime={date} lwc:external&gt;&lt;\/relative-time&gt;\n  &lt;\/p&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<p>\u4f7f\u7528 \u4e2d\u7684\u51fd\u6570\u5bfc\u5165\u9759\u6001\u8d44\u6e90\u3002<code>loadScriptlightning\/platformResourceLoader<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/externalExample.js\nimport { LightningElement } from \"lwc\";\nimport { loadScript } from \"lightning\/platformResourceLoader\";\nimport timeElements from \"@salesforce\/resourceUrl\/timeElements\";\n\nexport default class extends LightningElement {\n  isCmpInitialized = false;\n  error;\n  date;\n\n  renderedCallback() {\n    if (this.isCmpInitialized) {\n      return;\n    }\n    this.isCmpInitialized = true;\n\n    loadScript(this, timeElements)\n      .then(() =&gt; {\n        this.initializeComponent();\n      })\n      .catch((error) =&gt; {\n        this.error = error;\n      });\n  }\n  initializeComponent() {\n    this.date = new Date();\n  }\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u793a\u4f8b\uff1a\u5c06 Web \u7ec4\u4ef6\u6dfb\u52a0\u4e3a LWC \u6a21\u5757<\/h2>\n\n\n\n<p>\u63d0\u793a<\/p>\n\n\n\n<p>\u6b64\u793a\u4f8b\u4e2d\u7684\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u7c7b\u4f3c\u4e8e\u00a0<code>lightning-helptext<\/code>\u00a0\u57fa\u672c\u7ec4\u4ef6\u3002\u5728\u4f7f\u7528\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u4e4b\u524d\uff0c\u8bf7\u68c0\u67e5\u57fa\u672c\u7ec4\u4ef6\u662f\u5426\u6ee1\u8db3\u60a8\u7684\u8981\u6c42\u3002<\/p>\n\n\n\n<p>\u6b64\u793a\u4f8b\u4f7f\u7528\u00a0MDN \u4e2d\u7684 popup-info \u7ec4\u4ef6\u3002\u8981\u5c06\u7ec4\u4ef6\u6dfb\u52a0\u4e3a LWC \u6a21\u5757\uff0c\u8bf7\u5728\u6587\u4ef6\u5939\u4e2d\u521b\u5efa\u4e00\u4e2a Lightning Web \u7ec4\u4ef6\u3002\u8ba9\u6211\u4eec\u547d\u540d\u5b83\u3002<code>force-app\/main\/default\/lwcpopupInfo<\/code><\/p>\n\n\n\n<p>\u5728\u6a21\u677f\u4e2d\uff0c\u5728\u5143\u7d20\u4e0a\u5305\u542b\u6307\u4ee4\u3002<code>lwc:external<\/code><code>popup-info<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- popupInfo.html --&gt;\n&lt;template&gt;\n  &lt;popup-info\n    lwc:external\n    img={logo}\n    data-text=\"Here's some popup text for your logo'\"\n  &gt;&lt;\/popup-info&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<p>\u5728 JavaScript \u6587\u4ef6\u4e2d\uff0c\u8bf7\u786e\u4fdd\u5728\u6a21\u5f0f\u4e0b\u521b\u5efa\u5f71\u5b50\u6839\u3002\u6b64\u793a\u4f8b\u4f7f\u7528 \u9644\u52a0\u7684\u9759\u6001\u8d44\u6e90\u3002\u5b83\u8fd8\u5c06\u56fe\u50cf\u8def\u5f84\u66ff\u6362\u4e3a \uff0c\u8be5\u8def\u5f84\u5f15\u7528\u4f5c\u4e3a\u9759\u6001\u8d44\u6e90\u4e0a\u4f20\u7684\u5fbd\u6807\u3002<code>closed<\/code><code>trailheadLogo<\/code><code>popup-info<\/code><code>\"img\/default.png\"<\/code><code>{$logo}<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/popupInfo.js\nimport { LightningElement } from \"lwc\";\nimport trailheadLogo from \"@salesforce\/resourceUrl\/trailhead_logo\";\n\n\/\/ Create a class for the element\nclass PopUpInfo extends HTMLElement {\n  constructor() {\n    \/\/ Always call super first in constructor\n    super();\n\n    \/\/ Create a shadow root\n    this.shadow = this.attachShadow({ mode: \"closed\" });\n  }\n\n  connectedCallback() {\n    \/\/ Create spans\n    const wrapper = document.createElement(\"span\");\n    wrapper.setAttribute(\"class\", \"wrapper\");\n\n    const icon = document.createElement(\"span\");\n    icon.setAttribute(\"id\", \"test\");\n    icon.setAttribute(\"class\", \"icon\");\n    icon.setAttribute(\"tabindex\", 0);\n\n    const info = document.createElement(\"span\");\n    info.setAttribute(\"class\", \"info\");\n\n    \/\/ Take attribute content and put it inside the info span\n    const text = this.getAttribute(\"data-text\");\n    info.textContent = text;\n\n    \/\/ Insert icon\n    const img = document.createElement(\"img\");\n    img.src = this.hasAttribute(\"img\") ? this.getAttribute(\"img\") : `{$logo}`;\n    icon.appendChild(img);\n\n    \/\/ Create some CSS to apply to the shadow dom\n    const style = document.createElement(\"style\");\n\n    style.textContent = `\n      .wrapper {\n        position: relative;\n      }\n      .info {\n        font-size: 0.8rem;\n        width: 200px;\n        display: inline-block;\n        border: 1px solid black;\n        padding: 10px;\n        background: white;\n        border-radius: 10px;\n        opacity: 0;\n        transition: 0.6s all;\n        position: absolute;\n        bottom: 20px;\n        left: 10px;\n        z-index: 3;\n      }\n      img {\n        width: 1.2rem;\n      }\n      .icon:hover + .info, .icon:focus + .info {\n        opacity: 1;\n      }\n    `;\n\n    \/\/ Attach the created elements to the shadow dom\n    this.shadow.appendChild(style);\n    this.shadow.appendChild(wrapper);\n    wrapper.appendChild(icon);\n    wrapper.appendChild(info);\n  }\n}\n\n\/\/ Define the new element\ncustomElements.define(\"popup-info\", PopUpInfo);\n\nexport default class PopupInfo extends LightningElement {\n  logo = trailheadLogo;\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"work-with-custom-elements-(beta)\">\u4f7f\u7528\u81ea\u5b9a\u4e49\u5143\u7d20\uff08\u6d4b\u8bd5\u7248\uff09<\/h2>\n\n\n\n<p>\u6ce8\u610f<\/p>\n\n\n\n<p>\u6b64\u529f\u80fd\u662f\u4e00\u9879\u6d4b\u8bd5\u7248\u670d\u52a1\u3002\u5ba2\u6237\u53ef\u81ea\u884c\u51b3\u5b9a\u662f\u5426\u8bd5\u7528\u6b64\u7c7b\u6d4b\u8bd5\u7248\u670d\u52a1\u3002\u5bf9\u6d4b\u8bd5\u7248\u670d\u52a1\u7684\u4efb\u4f55\u4f7f\u7528\u5747\u53d7\u534f\u8bae\u548c\u6761\u6b3e\u4e2d\u63d0\u4f9b\u7684\u9002\u7528\u6d4b\u8bd5\u7248\u670d\u52a1\u6761\u6b3e\u7684\u7ea6\u675f\u3002<\/p>\n\n\n\n<p>\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u662f\u60a8\u53ef\u4ee5\u4f7f\u7528 \u521b\u5efa\u7684\u00a0Web \u7ec4\u4ef6\uff0c\u4ece\u800c\u751f\u6210\u53ef\u5728 LWC \u5e94\u7528\u7a0b\u5e8f\u4e2d\u91cd\u7528\u7684\u81ea\u5b9a\u4e49\u5143\u7d20\u3002\u9664\u975e\u4f7f\u7528\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\uff0c\u5426\u5219\u65e0\u9700\u5c06\u81ea\u5b9a\u4e49\u5143\u7d20\u4e0e LWC \u4e00\u8d77\u4f7f\u7528\u3002\u5c31\u672c\u6587\u800c\u8a00\uff0c\u81ea\u5b9a\u4e49\u5143\u7d20\u548c\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u662f\u53ef\u4e92\u6362\u7684\u3002<code>customElements.define()<\/code><\/p>\n\n\n\n<p>\u6ce8\u610f<\/p>\n\n\n\n<p>\u5fc5\u987b\u5728 Salesforce \u7ec4\u7ec7\u4e2d\u542f\u7528 Lightning Web\u00a0Security \uff08LWS\uff09\uff0c\u56e0\u4e3a Lightning\u00a0Locker \u4e0d\u652f\u6301\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u3002<\/p>\n\n\n\n<p>\u81ea\u5b9a\u4e49\u5143\u7d20\u5fc5\u987b\u9075\u5faa\u8fd9\u4e9b\u7279\u5f81\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528 via \u521d\u59cb\u5316\u81ea\u5b9a\u4e49\u5143\u7d20\u3002<code>constructor()<\/code><code>class<\/code><\/li>\n\n\n\n<li>\u4f7f\u7528\u9634\u5f71 DOM \u6216\u6d45\u8272 DOM\u3002\u5bf9\u4e8e\u5f71\u5b50 DOM\uff0cLWS \u4ec5\u652f\u6301\u5173\u95ed\u6a21\u5f0f\u3002<\/li>\n\n\n\n<li>\u4f7f\u7528\u00a0<code>customElements.define\uff08name\uff0c constructor\uff09<\/code>\u00a0\u5728\u5176\u4e2d\u6ce8\u518c\u81ea\u5b9a\u4e49\u5143\u7d20\u3002\u5fc5\u987b\u5305\u542b\u8fde\u5b57\u7b26\uff0c\u5e76\u4e14\u5728\u9875\u9762\u4e0a\u662f\u552f\u4e00\u7684\u3002<code>CustomElementRegistryname<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u5728\u81ea\u5b9a\u4e49\u5143\u7d20\u4e2d\u4f7f\u7528\u6807\u8bb0\u662f\u53ef\u9009\u7684\u3002\u60a8\u53ef\u4ee5\u4f7f\u7528 \u521b\u5efa\u6807\u7b7e\u3002\u60a8\u4e0d\u80fd\u5728 LWC HTML \u6a21\u677f\u4e2d\u4f7f\u7528\u5d4c\u5957\u6807\u8bb0\u3002<code>&lt;template&gt;<\/code><code>&lt;template&gt;<\/code><code>document.createElement(\"template\");<\/code><code>&lt;template&gt;<\/code><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5b9a\u4e49\u81ea\u5b9a\u4e49\u5143\u7d20<\/h2>\n\n\n\n<p>\u5728 LWC \u4e2d\uff0c\u53ea\u6709\u5728\u4f7f\u7528\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u65f6\u624d\u9700\u8981\u81ea\u5b9a\u4e49\u5143\u7d20\u3002\u5728 LWC \u4e2d\u5b9e\u73b0\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u65f6\uff0c\u6211\u4eec\u5efa\u8bae\u60a8\u53c2\u8003\u8be5\u7ec4\u4ef6\u7684\u6587\u6863\u4ee5\u83b7\u53d6\u4f7f\u7528\u4fe1\u606f\u3002<\/p>\n\n\n\n<p>\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u5305\u542b\u81ea\u5b9a\u4e49\u5143\u7d20\u5b9a\u4e49\uff0c\u8be5\u5b9a\u4e49\u6269\u5c55\u4e86\u00a0HTMLElement \u7c7b\u3002\u81ea\u5b9a\u4e49\u5143\u7d20\u5b9a\u4e49\u63cf\u8ff0\u5982\u4f55\u663e\u793a\u5143\u7d20\u4ee5\u53ca\u6dfb\u52a0\u6216\u5220\u9664\u5143\u7d20\u65f6\u8981\u6267\u884c\u7684\u64cd\u4f5c\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class MyCustomElement extends HTMLElement {\n  constructor() {\n    super();\n    \/* custom element created *\/\n  }\n  connectedCallback() {\n    \/* element is added to document *\/\n  }\n  disconnectedCallback() {\n    \/* element is removed from the document *\/\n  }\n  static get observedAttributes() {\n    return &#91;\n      \/* array of attribute names to monitor for changes *\/\n    ];\n  }\n  attributeChangedCallback(name, oldValue, newValue) {\n    \/* one of attributes listed above is modified *\/\n  }\n  adoptedCallback() {\n    \/* element is moved to a new document *\/\n  }\n}\n\/* register the element *\/\ncustomElements.define(\"my-custom-element\", MyCustomElement);<\/code><\/pre>\n\n\n\n<p>\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u884c\u4e3a\u5728\u751f\u547d\u5468\u671f\u56de\u8c03\u4e2d\u63cf\u8ff0\uff0c\u4f8b\u5982 in \u6216 \u3002<code>connectedCallback()disconnectedCallback()<\/code><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>constructor()<\/code>-\u5728\u521d\u59cb\u5316\u81ea\u5b9a\u4e49\u5143\u7d20\u65f6\u8c03\u7528\u3002\u5b83\u5fc5\u987b\u8c03\u7528\u5e76\u53ef\u4ee5\u6307\u5b9a\u4efb\u4f55\u9884\u6e32\u67d3\u8fc7\u7a0b\uff0c\u4f8b\u5982\u8bbe\u7f6e\u9634\u5f71\u7684\u5185\u5bb9\u3002<code>super()<\/code><\/li>\n\n\n\n<li><code>connectedCallback()<\/code>-\u5728\u81ea\u5b9a\u4e49\u5143\u7d20\u8fde\u63a5\u5230 DOM \u65f6\u8c03\u7528\u3002<\/li>\n\n\n\n<li><code>disconnectedCallback()<\/code>-\u5728\u81ea\u5b9a\u4e49\u5143\u7d20\u4e0e DOM \u65ad\u5f00\u8fde\u63a5\u65f6\u8c03\u7528\u3002<\/li>\n\n\n\n<li><code>observedAttributes()<\/code>-\u8fd4\u56de\u8981\u89c2\u5bdf\u7684\u5c5e\u6027\u6570\u7ec4\u3002<\/li>\n\n\n\n<li><code>attributeChangedCallback()<\/code>-\u5728\u6dfb\u52a0\u3001\u5220\u9664\u6216\u66f4\u6539\u5c5e\u6027\u65f6\u8c03\u7528\u3002\u6307\u5b9a\u8981\u5728 \u4e2d\u89c2\u5bdf\u7684\u5c5e\u6027\u3002<code>observeAttributes()<\/code><\/li>\n\n\n\n<li><code>adoptedCallback()<\/code>-\u5728\u5c06\u81ea\u5b9a\u4e49\u5143\u7d20\u79fb\u52a8\u5230\u65b0\u6587\u6863\u65f6\u8c03\u7528\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u521b\u5efa\u81ea\u5b9a\u4e49\u5143\u7d20\u6784\u9020\u51fd\u6570<\/h3>\n\n\n\n<p>\u5728 LWC \u4e2d\uff0c\u53ea\u6709\u5728\u4f7f\u7528\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u65f6\u624d\u9700\u8981\u81ea\u5b9a\u4e49\u5143\u7d20\u3002\u5728 LWC \u4e2d\u5b9e\u73b0\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u65f6\uff0c\u6211\u4eec\u5efa\u8bae\u60a8\u53c2\u8003\u8be5\u7ec4\u4ef6\u7684\u6587\u6863\u4ee5\u83b7\u53d6\u4f7f\u7528\u4fe1\u606f\u3002<\/p>\n\n\n\n<p>\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u5305\u542b\u4e00\u4e2a\u6784\u9020\u51fd\u6570\uff0c\u7528\u4e8e\u8bbe\u7f6e\u521d\u59cb\u72b6\u6001\u548c\u9ed8\u8ba4\u503c\u3001\u8bbe\u7f6e\u4e8b\u4ef6\u4fa6\u542c\u5668\u4ee5\u53ca\u521b\u5efa\u5f71\u5b50\u6839\u3002<\/p>\n\n\n\n<p>\u82e5\u8981\u5efa\u7acb\u539f\u578b\u94fe\uff0c\u8bf7\u8c03\u7528\u6784\u9020\u51fd\u6570\u3002\u4f7f\u7528 \u5c06\u5f71\u5b50\u6839\u9644\u52a0\u5230\u81ea\u5b9a\u4e49\u5143\u7d20\u3002LWS \u8981\u6c42\u5c06\u6a21\u5f0f\u8bbe\u7f6e\u4e3a \u3002\u4e86\u89e3 Lightning\u00a0Web Security \u4e0e Lightning Locker \u7684\u6bd4\u8f83\u7ed3\u679c\u3002<code>super()this.attachShadow()closed<\/code><\/p>\n\n\n\n<p>\u6ce8\u610f<\/p>\n\n\n\n<p>\u5728\u5173\u95ed\u6a21\u5f0f\u4e0b\uff0c\u8be5\u5c5e\u6027\u8fd4\u56de null\uff0c\u56e0\u6b64\u4e0d\u80fd\u4f7f\u7528 \u6765\u8bbf\u95ee\u548c\u64cd\u4f5c\u5143\u7d20\u7684\u5f71\u5b50\u6839\u3002\u5728\u95ed\u5408\u6a21\u5f0f\u4e0b\u521b\u5efa\u81ea\u5b9a\u4e49\u5143\u7d20\u65f6\uff0c\u8bf7\u4f7f\u7528\u5176\u4ed6\u53d8\u91cf\uff08\u5982 \u6216 \uff09\u4fdd\u5b58\u5bf9\u5f71\u5b50\u6839\u7684\u5f15\u7528\u3002<code>shadowRoot<\/code><code>shadowRoot<\/code><code>shadow<\/code><code>__shadowRoot<\/code><\/p>\n\n\n\n<p>\u8981\u521b\u5efa\u5143\u7d20\u7684\u5185\u90e8\u5f71\u5b50 DOM \u7ed3\u6784\uff0c\u8bf7\u4f7f\u7528 \u8ffd\u52a0\u5185\u5bb9\u3002\u6b64\u793a\u4f8b\u5b9a\u4e49 LWC \u7ec4\u4ef6\u751f\u547d\u5468\u671f\u4e4b\u5916\u7684\u81ea\u5b9a\u4e49\u5143\u7d20\u3002<code>.innerHTML<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/myComponent.js\nimport { LightningElement } from \"lwc\";\n\ncustomElements.define(\n  \"my-custom-element\",\n  class extends HTMLElement {\n    constructor() {\n      super();\n      this.attachShadow({ mode: \"closed\" }).innerHTML = \"&lt;div&gt;Custom Element Constructor&lt;\/div&gt;\";\n    }\n  },\n);\n\nexport default class MyComponent extends LightningElement {\n  greeting = \"World\";\n}<\/code><\/pre>\n\n\n\n<p>\u82e5\u8981\u4f7f\u7528\u81ea\u5b9a\u4e49\u5143\u7d20\u7684\u5c5e\u6027\u548c\u5b50\u5143\u7d20\uff0c\u8bf7\u6539\u7528 or\u3002\u4f8b\u5982\uff0c\u5982\u679c\u8981\u521b\u5efa\u5143\u7d20\u5e76\u5728\u5176\u4e0a\u8bbe\u7f6e\u5c5e\u6027\uff0c\u8bf7\u5c06\u5b83\u4eec\u63a8\u8fdf\u5230\u751f\u547d\u5468\u671f\u56de\u8c03\u4e4b\u4e00\uff0c\u5e76\u5728\u5c5e\u6027\u66f4\u6539\u65f6\u7528\u4e8e\u5b9a\u4e49\u56de\u8c03\u3002\u6709\u5173\u8be6\u7ec6\u4fe1\u606f\uff0c\u8bf7\u53c2\u9605\u81ea\u5b9a\u4e49\u5143\u7d20\u89c4\u8303\u3002<code>connectedCallback()renderedCallback()attributeChangedCallback()<\/code><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5728 LWC \u4e2d\u4f7f\u7528\u81ea\u5b9a\u4e49\u5143\u7d20<\/h2>\n\n\n\n<p>\u5c06 LWC \u6a21\u677f\u4e2d\u7684\u81ea\u5b9a\u4e49\u5143\u7d20\u4e0e\u6307\u4ee4\u4e00\u8d77\u4f7f\u7528\u3002<code>lwc:external<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- myComponent.html --&gt;\n&lt;template&gt;\n  &lt;div class=\"slds-var-m-around_medium\"&gt;Hello, {greeting}!&lt;\/div&gt;\n  &lt;my-custom-element lwc:external&gt;&lt;\/my-custom-element&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u793a\u4f8b\uff1a\u521b\u5efa\u9012\u589e\u6309\u94ae\u6807\u7b7e\u7684\u81ea\u5b9a\u4e49\u5143\u7d20<\/h2>\n\n\n\n<p>\u4ee5\u4e0b\u793a\u4f8b\u6f14\u793a\u4e86\u81ea\u5b9a\u4e49\u5143\u7d20\u7684\u7ed3\u6784\u3002\u8be5\u793a\u4f8b\u521b\u5efa\u4e00\u4e2a\u6309\u94ae\uff0c\u6309\u4e0b\u8be5\u6309\u94ae\u65f6\uff0c\u8be5\u6309\u94ae\u7684\u6807\u7b7e\u4e0a\u7684\u8ba1\u6570\u5668\u4f1a\u9012\u589e\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/myCounterButton.js\nimport { LightningElement } from \"lwc\";\n\ncustomElements.define(\n  \"my-counter\",\n  class extends HTMLElement {\n    count = 0;\n    handler = null;\n    shadow = null;\n    constructor() {\n      super();\n      this.shadow = this.attachShadow({ mode: \"closed\" });\n      this.shadow.innerHTML = `Button:&lt;button&gt;${this.count}&lt;\/button&gt;`;\n    }\n    connectedCallback() {\n      this.handler = () =&gt; {\n        this.count++;\n        this.shadow.firstElementChild.innerHTML = this.count;\n      };\n      this.shadow.firstElementChild.addEventListener(\"click\", this.handler);\n    }\n    disconnectedCallback() {\n      this.shadow.firstElementChild.removeEventListener(\"click\", this.handler);\n    }\n  },\n);\n\nexport default class MyCounterButton extends LightningElement {\n  \/\/ your LWC component definition here\n}<\/code><\/pre>\n\n\n\n<p>\u82e5\u8981\u5728 LWC \u4e2d\u4f7f\u7528\u81ea\u5b9a\u4e49\u5143\u7d20\uff0c\u8bf7\u4f7f\u7528\u6307\u4ee4\u5c06\u5176\u6dfb\u52a0\u5230\u6a21\u677f\u4e2d\u3002<code>lwc:external<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- myCounterButton.html --&gt;\n&lt;template&gt;\n  &lt;my-counter lwc:external&gt;&lt;\/my-counter&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<p>\u8be5\u7ec4\u4ef6\u5728 DOM \u4e2d\u5448\u73b0\u5982\u4e0b\u3002\u6bcf\u6b21\u5355\u51fb\u6309\u94ae\u6807\u7b7e\u65f6\uff0c\u6309\u94ae\u6807\u7b7e\u90fd\u4f1a\u9012\u589e\u3002<code>${this.count}<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;my-counter-button&gt;\n    &lt;my-counter&gt;\n      #shadow-root (closed)\n      |  \"Button:\"\n      |  &lt;button&gt;0&lt;\/button&gt;\n    &lt;\/my-counter&gt;\n&lt;\/my-counter-button&gt;<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u793a\u4f8b\uff1a\u4f7f\u7528\u5c5e\u6027\u66f4\u6539\u56de\u8c03\u9012\u589e\u6309\u94ae<\/h2>\n\n\n\n<p>\u6b64\u793a\u4f8b\u4e0e\u4e0a\u4e00\u4e2a\u793a\u4f8b\u7c7b\u4f3c\uff0c\u4f46\u5b83\u76d1\u89c6\u81ea\u5b9a\u4e49\u5143\u7d20\u7684\u5c5e\u6027\uff0c\u7528\u4e8e\u5728\u5c5e\u6027\u66f4\u6539\u65f6\u5b9a\u4e49\u56de\u8c03\u3002<code>count<\/code><code>attributeChangedCallback()<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/myCounterWithCallback.js\nimport { LightningElement } from \"lwc\";\n\ncustomElements.define(\n  \"my-counter\",\n  class MyCounter extends HTMLElement {\n    constructor() {\n      super();\n      this.shadow = this.attachShadow({ mode: \"closed\" });\n    }\n\n    get count() {\n      return this.getAttribute(\"count\");\n    }\n\n    set count(val) {\n      this.setAttribute(\"count\", val);\n    }\n\n    connectedCallback() {\n      this.renderButton();\n      let btn = this.shadow.querySelector(\"#btn\");\n      btn.addEventListener(\"click\", this.increment.bind(this));\n    }\n\n    static get observedAttributes() {\n      return &#91;\"count\"];\n    }\n\n    attributeChangedCallback(prop, oldVal, newValue) {\n      if (prop === \"count\") {\n        this.renderButton();\n        let btn = this.shadow.querySelector(\"#btn\");\n        btn.addEventListener(\"click\", this.increment.bind(this));\n        \/\/ do something else\n      }\n    }\n\n    increment() {\n      this.count++;\n    }\n\n    renderButton() {\n      this.shadow.innerHTML = `\n        &lt;button id=\"btn\"&gt;${this.count}&lt;\/button&gt;\n      `;\n    }\n  },\n);\n\nexport default class extends LightningElement {}<\/code><\/pre>\n\n\n\n<p>\u5c06\u81ea\u5b9a\u4e49\u5143\u7d20\u6807\u7b7e\u6dfb\u52a0\u5230 LWC \u6a21\u677f\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- myCounterWithCallback.html --&gt;\n&lt;template&gt;\n  &lt;my-counter count=\"0\" lwc:external&gt;&lt;\/my-counter&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"pass-data-to-a-custom-element-(beta)\">\u5c06\u6570\u636e\u4f20\u9012\u5230\u81ea\u5b9a\u4e49\u5143\u7d20\uff08\u6d4b\u8bd5\u7248\uff09<\/h2>\n\n\n\n<p>\u81ea\u5b9a\u4e49\u5143\u7d20\u662f\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u7684\u6784\u5efa\u57fa\u5757\u3002\u4f7f\u7528\u7279\u6027\u3001\u5c5e\u6027\u6216\u00a0<code>lwc\uff1aspread<\/code>\u00a0\u6307\u4ee4\u5c06\u6570\u636e\u4f20\u9012\u5230\u81ea\u5b9a\u4e49\u5143\u7d20\u3002\u4f20\u9012\u6570\u636e\u65f6\uff0cLWC \u9ed8\u8ba4\u5c06\u6570\u636e\u8bbe\u7f6e\u4e3a\u5c5e\u6027\uff0c\u5e76\u4e14\u4ec5\u5f53\u5c5e\u6027\u5b58\u5728\u65f6\u624d\u8bbe\u7f6e\u5c5e\u6027\u3002<\/p>\n\n\n\n<p>\u521d\u59cb\u5316\u5f71\u5b50\u5185\u5bb9\u7684\u6784\u9020\u51fd\u6570\u4ec5\u8c03\u7528\u4e00\u6b21\u3002\u5728\u4f7f\u7528\u7279\u6027\u6216\u5c5e\u6027\u65f6\uff0c\u8bf7\u8003\u8651\u8fd9\u4e9b\u51c6\u5219\u3002<code>this.attachShadow({ mode: 'closed' })<\/code><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f7f\u7528\u5c5e\u6027\u4f20\u9012\u6570\u636e<\/h2>\n\n\n\n<p>\u5448\u73b0\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u540e\uff0c\u5c06\u5ffd\u7565\u5c5e\u6027\u66f4\u6539\u3002\u8981\u89c2\u5bdf\u5c5e\u6027\u5e76\u786e\u4fdd\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u5448\u73b0\u60a8\u7684\u66f4\u6539\uff0c\u8bf7\u4f7f\u7528\u9759\u6001 getter \u548c\u65b9\u6cd5\u3002\u5f53\u89c2\u5bdf\u5230\u7684\u5c5e\u6027\u53d1\u751f\u66f4\u6539\u65f6\uff0c\u56de\u8c03\u5c06\u8fd0\u884c\u3002\u82e5\u8981\u5904\u7406\u5c5e\u6027\u6570\u636e\u7684\u5e8f\u5217\u5316\u548c\u53cd\u5e8f\u5217\u5316\uff0c\u8bf7\u4f7f\u7528 getter \u548c setter\uff0c\u5982\u672c\u793a\u4f8b\u6240\u793a\u3002<code>observedAttributes()<\/code><code>attributeChangedCallback()<\/code><code>attributeChangedCallback()<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class extends HTMLElement {\n    static observedAttributes = &#91;\"myAttr\"];\n    attributeChangedCallback(attr, oldVal, newVal) {\n      if (attrName === \"myAttr\") {\n        this.shadow.getElementById(\"myElement\").myAttr = newVal === \"true\";\n      }\n    }\n    set myAttr(bool) {\n      this.setAttribute(\"myAttr\", bool.toString());\n    }\n    get myAttr() {\n      return this.getAttribute(\"myAttr\") === \"true\";\n    }\n}<\/code><\/pre>\n\n\n\n<p>\u8bf7\u53c2\u9605\u4f7f\u7528\u5c5e\u6027\u66f4\u6539\u9012\u589e\u6309\u94ae\u7684\u793a\u4f8b\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f7f\u7528\u5c5e\u6027\u4f20\u9012\u6570\u636e<\/h2>\n\n\n\n<p>\u8981\u4f7f\u7528\u5c5e\u6027\uff0c\u8bf7\u4f7f\u7528 getter \u548c setter\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class extends HTMLElement {\n  _message = 'Hello';\n  set message(value) {\n    this._message = value;\n  }\n  get message() {\n    return this._message;\n  }\n}<\/code><\/pre>\n\n\n\n<p>\u4f8b\u5982\uff0c\u60a8\u6709\u4e00\u4e2a\u81ea\u5b9a\u4e49\u5143\u7d20\uff0c\u8be5\u5143\u7d20\u5177\u6709\u4f7f\u7528\u00a0<code>lwc\uff1aspread<\/code>\u00a0\u6307\u4ee4\u4f20\u9012\u7ed9\u81ea\u5b9a\u4e49\u5143\u7d20\u7684\u5c5e\u6027\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- myMessage.html --&gt;\n&lt;template&gt;\n  &lt;c-message lwc:external lwc:spread={props}&gt;&lt;\/c-message&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<p>\u81ea\u5b9a\u4e49\u5143\u7d20\u663e\u793a\u4e00\u4e2a\u6309\u94ae\u3002\u8981\u5411\u6309\u94ae\u6dfb\u52a0\u4e8b\u4ef6\u4fa6\u542c\u5668\uff0c\u8bf7\u4f7f\u7528 \u3002<code>addEventListener()<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ myMessage.js\nimport { LightningElement } from \"lwc\";\n\ncustomElements.define(\n  \"c-message\",\n  class extends HTMLElement {\n    constructor() {\n      super();\n      this.shadow = this.attachShadow({ mode: \"closed\" });\n      this.shadow.innerHTML = `&lt;button&gt;click&lt;\/button&gt;`;\n      this.shadow.querySelector(\"button\").addEventListener(\"click\", (event) =&gt; {\n        console.log(`message: ${this.message}`);\n      });\n    }\n\n    set message(value) {\n      this._message = value;\n    }\n    get message() {\n      return this._message;\n    }\n  },\n);\n\nexport default class MyMessage extends LightningElement {\n  props = {\n    message: \"Hello custom element\",\n  };\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u5c06\u6570\u636e\u4f20\u9012\u5230\u5b50\u7ec4\u4ef6<\/h2>\n\n\n\n<p>\u8003\u8651\u4e00\u4e2a\u7236\u7ec4\u4ef6\uff0c\u8be5\u7ec4\u4ef6\u5305\u542b\u5b9a\u4e49\u81ea\u5b9a\u4e49\u5143\u7d20\u7684\u5b50\u7ec4\u4ef6\u3002\u4f7f\u7528\u00a0<code>lwc\uff1aspread<\/code>\u00a0\u6307\u4ee4\u5c06\u5c5e\u6027\u4f20\u9012\u7ed9\u5b50\u7ec4\u4ef6\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- myApp.html --&gt;\n&lt;template&gt;\n  &lt;c-cmp lwc:spread={myProps}&gt;&lt;\/c-cmp&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<p>\u4f7f\u7528\u5177\u6709\u952e\u503c\u5bf9\u7684\u5bf9\u8c61\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ myApp.js\nimport { LightningElement } from \"lwc\";\n\nexport default class MyApp extends LightningElement {\n  myProps = {\n    name: \"Guest\",\n    greeting: \"Hello\",\n  };\n}<\/code><\/pre>\n\n\n\n<p>\u5728\u5b50\u7ec4\u4ef6\u4e2d\uff0c\u521b\u5efa\u81ea\u5b9a\u4e49\u5143\u7d20\u7684\u5b9e\u4f8b\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- myCmp.html --&gt;\n&lt;template&gt;\n  &lt;c-custom-el lwc:external&gt; {greeting}, {name} &lt;\/c-custom-el&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<p>\u5728 JavaScript \u4e2d\u8c03\u7528 \u5e76\u5c06\u5c5e\u6027\u516c\u5f00\u7ed9\u7236\u7ec4\u4ef6\u3002<code>constructor()<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ myCmp.js\nimport { LightningElement, api } from \"lwc\";\n\ncustomElements.define(\n  \"c-custom-el\",\n  class extends HTMLElement {\n    constructor() {\n      super();\n      this.attachShadow({ mode: \"closed\" }).innerHTML = \"&lt;slot&gt;&lt;\/slot&gt;\";\n    }\n  },\n);\nexport default class MyCmp extends LightningElement {\n  @api name;\n  @api greeting;\n}<\/code><\/pre>\n\n\n\n<p>\u81ea\u5b9a\u4e49\u5143\u7d20\u7684\u5448\u73b0\u65b9\u5f0f\u5982\u4e0b\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;my-app&gt;\n  #shadow-root (open)\n  |  &lt;my-cmp&gt; \n  |    #shadow-root (open) \n  |    |  &lt;c-custom-el&gt;\n  |    |    #shadow-root (closed)\n  |    |    | Hello, Guest\n  |    |  &lt;\/c-custom-el&gt;\n  |  &lt;\/my-cmp&gt;\n&lt;\/my-app&gt;<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u5c06\u6807\u8bb0\u4f20\u9012\u5230\u81ea\u5b9a\u4e49\u5143\u7d20\u4e2d\u7684\u69fd<\/h2>\n\n\n\n<p>\u5c06\u6807\u8bb0\u4f20\u9012\u5230\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u4e2d\u7684\u69fd\u7684\u884c\u4e3a\u7c7b\u4f3c\u4e8e\u00a0LWC \u7ec4\u4ef6\u4e2d\u7684\u69fd\u3002<\/p>\n\n\n\n<p>\u6ce8\u610f<\/p>\n\n\n\n<p>\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u4e0d\u652f\u6301\u5408\u6210\u9634\u5f71\u7684\u5f00\u69fd\u5b9e\u73b0\u3002<\/p>\n\n\n\n<p>\u8003\u8651\u4f7f\u7528\u5e26\u6709\u4e00\u4e9b\u6807\u8bb0\u7684\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>customElements.define(\n  \"c-custom-slot\",\n  class extends HTMLElement {\n    constructor() {\n      super();\n      this.attachShadow({ mode: \"closed\" }).innerHTML = `\n    &lt;h1&gt;My title&lt;\/h1&gt;\n    &lt;div&gt;\n        &lt;p&gt;Some content here&lt;\/p&gt;\n    &lt;\/div&gt;\n    &lt;slot&gt;&lt;\/slot&gt;\n    `;\n    }\n  },\n);<\/code><\/pre>\n\n\n\n<p>\u4ee5\u4e0b\u69fd\u4f4d\u5185\u5bb9\u5c06\u663e\u793a\u5728\u5143\u7d20\u4e2d\u3002<code>&lt;slot&gt;<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;template&gt;\n  &lt;c-custom-slot lwc:external&gt;\n    &lt;div class=\"slotted\"&gt;slot content&lt;\/div&gt;\n  &lt;\/c-custom-slot&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<p>\u8be5\u7ec4\u4ef6\u5728 DOM \u4e2d\u5448\u73b0\u5982\u4e0b\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;c-custom-slot&gt;\n  #shadow-root (closed)\n  |  &lt;h1&gt;My title&lt;\/h1&gt;\n  |  &lt;div&gt;&lt;p&gt;Some content here&lt;\/p&gt;&lt;\/div&gt;\n  |  &lt;slot&gt;\n  |    &lt;div class=\"slotted\"&gt;slot content&lt;\/div&gt;\n  |  &lt;\/slot&gt;\n&lt;\/c-custom-slot&gt;<\/code><\/pre>\n\n\n\n<p>\u540c\u6837\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528\u8fd9\u6837\u7684\u547d\u540d\u69fd\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ mySlot.js\nimport { LightningElement, api } from \"lwc\";\n\ncustomElements.define(\n  \"c-slotting\",\n  class extends HTMLElement {\n    constructor() {\n      super();\n      this.shadow = this.attachShadow({ mode: \"closed\" });\n      this.shadow.innerHTML = `&lt;slot name=\"myslot\"&gt;&lt;\/slot&gt;`;\n    }\n  },\n);\nexport default class MySlot extends LightningElement {}<\/code><\/pre>\n\n\n\n<p>\u5728\u6807\u8bb0\u4e2d\u5305\u542b\u547d\u540d\u69fd\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- mySlot.html --&gt;\n&lt;c-slotting lwc:external&gt;\n  &lt;p&gt;slotted incorrectly&lt;\/p&gt;\n  &lt;p slot=\"myslot\"&gt;slotted correctly&lt;\/p&gt;\n&lt;\/c-slotting&gt;<\/code><\/pre>\n\n\n\n<p>\u8be5\u7ec4\u4ef6\u5728 DOM \u4e2d\u5448\u73b0\u5982\u4e0b\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;my-slot&gt;\n  #shadow-root (open)\n  |  &lt;c-slotting&gt;\n  |    #shadow-root (closed)\n  |    |  &lt;p&gt;slotted incorrectly&lt;\/p&gt;\n  |    |  &lt;p slot=\"myslot\"&gt;slotted correctly&lt;\/p&gt;\n  |  &lt;\/c-slotting&gt;\n&lt;\/my-slot&gt;<\/code><\/pre>\n\n\n\n<p>\u5728\u672c\u673a\u5f71\u5b50\u7ec4\u4ef6\u4e2d\uff0c\u63d2\u69fd\u5185\u5bb9\u4fdd\u7559\u5728\u9876\u7ea7\u5143\u7d20\u4e2d\u3002<code>CustomElementConstructor<\/code><\/p>\n\n\n\n<p>\u4f8b\u5982\uff0c\u6587\u4ef6\u4e2d\u7684\u6b64\u9876\u7ea7\u5143\u7d20\u5305\u62ec\u63d2\u69fd\u5185\u5bb9\u3002<code>&lt;slot&gt;<\/code><code>index.html<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;c-custom-slot&gt;\n  &lt;div class=\"slotted\"&gt;Pre-existing slot content&lt;\/div&gt;\n&lt;\/c-custom-slot&gt;<\/code><\/pre>\n\n\n\n<p>\u8be5\u7ec4\u4ef6\u5728 DOM \u4e2d\u5448\u73b0\u5982\u4e0b\u3002\u5b83\u4fdd\u7559\u4e86\u539f\u59cb\u7684\u63d2\u69fd\u5185\u5bb9\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;c-custom-slot&gt;\n  #shadow-root (closed)\n  |  &lt;slot&gt;\n  |    &lt;div class=\"slotted\"&gt;Pre-existing slot content&lt;\/div&gt;\n  |  &lt;\/slot&gt;\n&lt;\/c-custom-slot&gt;<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f7f\u7528\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u4e2d\u7684\u4e8b\u4ef6<\/h2>\n\n\n\n<p>\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u4e2d\u7684\u4e8b\u4ef6\u4e0e\u00a0LWC \u4e2d\u7684\u4e8b\u4ef6\u7c7b\u4f3c\u3002\u4e8b\u4ef6\u7ed1\u5b9a\u4ec5\u652f\u6301\u5c0f\u5199\u4e8b\u4ef6\u3002\u8981\u4f7f\u7528\u5177\u6709\u975e\u5c0f\u5199\u540d\u79f0\u7684\u4e8b\u4ef6\uff0c\u8bf7\u4f7f\u7528\u00a0addEventListener\uff08\uff09 API\u00a0\u6dfb\u52a0\u4e8b\u4ef6\u4fa6\u542c\u5668\u3002<\/p>\n\n\n\n<p>\u5728 \u4e2d\u6dfb\u52a0\u4e8b\u4ef6\u4fa6\u542c\u5668\u3002<code>constructor()<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>customElements.define(\n  \"c-element-with-events\",\n  class extends HTMLElement {\n    constructor() {\n      super();\n      this.attachShadow({ mode: \"closed\" });\n      this.shadow.innerHTML = `CLICK ME!`;\n      this.addEventListener(\"click\", this.handleClick);\n    }\n    handleClick() {\n      this.dispatchEvent(new CustomEvent(\"lowercaseevent\"));\n      this.dispatchEvent(new CustomEvent(\"camelEvent\"));\n    }\n  },\n);<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u6ce8\u610f\u4e8b\u9879<\/h2>\n\n\n\n<p>\u672a\u6ce8\u518c\u7684\u81ea\u5b9a\u4e49\u5143\u7d20\u5448\u73b0\u4e3a\u672c\u673a\u63a5\u53e3\u7684\u5b9e\u4f8b\uff0c\u8be5\u5b9e\u4f8b\u5728\u4e0d\u6dfb\u52a0\u4efb\u4f55\u5c5e\u6027\u6216\u65b9\u6cd5\u7684\u60c5\u51b5\u4e0b\u8fdb\u884c\u6269\u5c55\u3002\u7136\u540e\uff0c\u6d4f\u89c8\u5668\u5c06\u5916\u90e8\u7ec4\u4ef6\u89c6\u4e3a\u672c\u673a\u7ec4\u4ef6\uff0c\u4e0e a \u6216 .<code>HTMLUnknownElement<\/code><code>HTMLElement<\/code><code>span<\/code><code>div<\/code><\/p>\n\n\n\n<p>\u5bf9\u4e8e\u5df2\u6ce8\u518c\u7684\u7ec4\u4ef6\uff0c\u5f15\u64ce\u4f1a\u5448\u73b0\u5173\u8054\u7684\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\uff0c\u5e76\u5c06\u5347\u7ea7\u63a8\u8fdf\u5230\u6d4f\u89c8\u5668\u3002<\/p>\n\n\n\n<p>\u6709\u5173\u66f4\u591a\u4fe1\u606f\uff0c\u8bf7\u53c2\u89c1\u00a0HTML \u89c4\u8303\uff1a\u5728\u521b\u5efa\u5143\u7d20\u540e\u5347\u7ea7\u5143\u7d20\u3002<\/p>\n\n\n\n<p>\u6b64\u5916\uff0c\u8bf7\u8003\u8651\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u4e0a\u7684\u8fd9\u4e9b\u5347\u7ea7\u884c\u4e3a\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5982\u679c\u672a\u5347\u7ea7\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\uff0cLWC \u4f1a\u5728\u6302\u8f7d\u548c\u66f4\u65b0\u65f6\u8bbe\u7f6e\u5176\u5c5e\u6027\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u5b58\u5728\u5ef6\u8fdf\u5347\u7ea7\uff0c\u5219\u8bbe\u7f6e\u5c5e\u6027\u800c\u4e0d\u662f\u5c5e\u6027\u3002<\/li>\n\n\n\n<li>\u5347\u7ea7\u540e\uff0c\u5982\u679c\u5c5e\u6027\u5b58\u5728\uff0c\u5219\u8bbe\u7f6e\u8be5\u5c5e\u6027\u800c\u4e0d\u662f\u8be5\u5c5e\u6027\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"append-styles-to-a-custom-element-(beta)\">\u5c06\u6837\u5f0f\u8ffd\u52a0\u5230\u81ea\u5b9a\u4e49\u5143\u7d20\uff08\u6d4b\u8bd5\u7248\uff09<\/h2>\n\n\n\n<p>\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u53ef\u4ee5\u5305\u542b\u5728\u5f71\u5b50 DOM \u6216\u8f7b\u91cf\u7ea7 DOM \u4e2d\u521b\u5efa\u7684\u81ea\u5b9a\u4e49\u5143\u7d20\u3002\u5bf9\u4e8e\u5f71\u5b50 DOM\uff0c\u5f00\u653e\u6a21\u5f0f\u6bd4\u5c01\u95ed\u6a21\u5f0f\u66f4\u5e7f\u6cdb\u5730\u4f7f\u7528\u3002\u8981\u4e86\u89e3\u60a8\u6b63\u5728\u4f7f\u7528\u7684\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u662f\u5426\u6b63\u5728\u4f7f\u7528\u7279\u5b9a\u7684\u5f71\u5b50\u6a21\u5f0f\uff0c\u8bf7\u53c2\u9605 Web \u7ec4\u4ef6\u6587\u6863\u3002\u6216\u8005\uff0c\u67e5\u770b Web \u7ec4\u4ef6\u6e90\u5e76\u67e5\u627e\u65b9\u6cd5\u3002\u4f7f\u7528\u8f7b\u91cf\u7ea7 DOM \u7684 Web \u7ec4\u4ef6\u4e0d\u4f7f\u7528\u8be5\u65b9\u6cd5\u3002<code>attachShadow({mode: 'closed|open'})attachShadow()<\/code><\/p>\n\n\n\n<p>\u786e\u5b9a\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u7684 DOM \u6a21\u578b\u540e\uff0c\u53ef\u4ee5\u51b3\u5b9a\u5982\u4f55\u8bbe\u7f6e\u81ea\u5b9a\u4e49\u5143\u7d20\u53ca\u5176\u5185\u90e8\u7ed3\u6784\u7684\u6837\u5f0f\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5728 Shadow DOM \u4e2d\u5b9e\u73b0\u81ea\u5b9a\u4e49\u5143\u7d20\u6837\u5f0f<\/h2>\n\n\n\n<p>\u4f7f\u7528\u5f71\u5b50 DOM\uff0c\u81ea\u5b9a\u4e49\u5143\u7d20\u65e0\u6cd5\u4ece\u5176\u5bb9\u5668\u7ec4\u4ef6\u7ee7\u627f\u6837\u5f0f\u3002\u540c\u6837\uff0c\u5728\u81ea\u5b9a\u4e49\u5143\u7d20\u4e2d\u5b9a\u4e49\u7684\u6837\u5f0f\u4e5f\u4e0d\u4f1a\u6e17\u51fa\u3002\u5728\u5173\u95ed\u6a21\u5f0f\u4e0b\uff0c\u60a8\u65e0\u6cd5\u5c06\u6837\u5f0f\u9644\u52a0\u5230\u81ea\u5b9a\u4e49\u5143\u7d20\u7684\u5f71\u5b50 DOM\u3002\u4f8b\u5982\uff0c\u8fd4\u56de null\u3002<code>this.refs.myEl.shadowRoot<\/code><\/p>\n\n\n\n<p>\u8bb8\u591a Web \u7ec4\u4ef6\u4f5c\u8005\u901a\u8fc7\u5c06\u6807\u8bb0\u9644\u52a0\u5230\u5f71\u5b50\u6839\u6765\u5b9e\u73b0\u81ea\u5b9a\u4e49\u5143\u7d20\u7684\u6837\u5f0f\u3002\u67e5\u770b Web \u7ec4\u4ef6\u6e90\u5e76\u67e5\u627e\u4e0e\u8fd9\u4e9b\u884c\u7c7b\u4f3c\u7684\u884c\u3002\u8fd9\u4e9b\u6837\u5f0f\u7684\u8303\u56f4\u9650\u5b9a\u5728\u5f71\u5b50\u6839\u5185\u3002<code>&lt;style&gt;<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>const style = document.createElement(\"style\");\nstyle.textContent = `.someSelector { color: red }`;\nthis.shadow.appendChild(style);<\/code><\/pre>\n\n\n\n<p>\u82e5\u8981\u5728\u95ed\u5408\u6a21\u5f0f\u4e0b\u8ffd\u52a0\u6837\u5f0f\uff0c\u53ef\u4ee5\u4f7f\u7528 CSS \u53d8\u91cf\uff08\u81ea\u5b9a\u4e49\u5c5e\u6027\uff09\u3001\u7c7b\u6216\u9634\u5f71\u90e8\u5206\u3002\u9664\u4e86\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u4e0a\u7684\u5f71\u5b50\u6839\u6837\u5f0f\u5b9e\u73b0\u4e4b\u5916\uff0c\u6211\u4eec\u4e0d\u5efa\u8bae\u4f7f\u7528 JavaScript \u6765\u5b9a\u4e49 CSS \u6837\u5f0f\u3002<\/p>\n\n\n\n<p>Web \u7ec4\u4ef6\u4f5c\u8005\u5141\u8bb8\u60a8\u8986\u76d6\u5f71\u5b50\u6839\u4e2d\u7684\u6837\u5f0f\uff08\u5982\u679c\u5b83\u4eec\u5305\u542b\u8fd9\u6837\u7684 CSS \u81ea\u5b9a\u4e49\u5c5e\u6027\uff09\u3002<\/p>\n\n\n\n<p>\u63d0\u793a<\/p>\n\n\n\n<p>\u67e5\u770b\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u6e90\u4ee3\u7801\u6216\u6587\u6863\uff0c\u4e86\u89e3\u53ef\u7528\u4e8e\u8bbe\u7f6e\u7ec4\u4ef6\u4e2d\u81ea\u5b9a\u4e49\u5143\u7d20\u6837\u5f0f\u7684\u53ef\u7528 CSS \u81ea\u5b9a\u4e49\u5c5e\u6027\u548c\u9634\u5f71\u90e8\u4ef6\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>style.textContent = `.someSelector { color: var(--my-title-color, \t#AA4A44)}`;<\/code><\/pre>\n\n\n\n<p>\u7531\u4e8e CSS \u81ea\u5b9a\u4e49\u5c5e\u6027\u4f1a\u6e17\u5165\u5f71\u5b50 DOM\uff0c\u56e0\u6b64\u60a8\u53ef\u4ee5\u8986\u76d6\u4e3b\u673a\u7ec4\u4ef6\u4e2d\u7684\u6837\u5f0f\u3002<\/p>\n\n\n\n<p>\u5047\u8bbe\u7b2c\u4e09\u65b9 Web \u7ec4\u4ef6\u63d0\u4f9b\u4e86\u5e26\u6709 CSS 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