{"id":3837,"date":"2024-01-11T13:56:05","date_gmt":"2024-01-11T05:56:05","guid":{"rendered":"http:\/\/www.ponybai.com\/?p=3837"},"modified":"2023-12-02T14:02:47","modified_gmt":"2023-12-02T06:02:47","slug":"%e7%bb%84%e4%bb%b6%e7%94%9f%e5%91%bd%e5%91%a8%e6%9c%9f","status":"publish","type":"post","link":"http:\/\/www.ponybai.com\/?p=3837","title":{"rendered":"\u7ec4\u4ef6\u751f\u547d\u5468\u671f"},"content":{"rendered":"\n<p>Lightning Web \u7ec4\u4ef6\u7684\u751f\u547d\u5468\u671f\u7531\u6846\u67b6\u7ba1\u7406\u3002\u6846\u67b6\u521b\u5efa\u7ec4\u4ef6\uff0c\u5c06\u5b83\u4eec\u63d2\u5165\u5230 DOM \u4e2d\uff0c\u5448\u73b0\u5b83\u4eec\uff0c\u7136\u540e\u5c06\u5b83\u4eec\u4ece DOM \u4e2d\u5220\u9664\u3002\u5b83\u8fd8\u76d1\u89c6\u7ec4\u4ef6\u7684\u5c5e\u6027\u66f4\u6539\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"lifecycle-flow\">\u751f\u547d\u5468\u671f\u6d41\u7a0b<\/h2>\n\n\n\n<p>\u6b64\u56fe\u663e\u793a\u4e86\u4ece\u521b\u5efa\u5230\u6e32\u67d3\u7684\u7ec4\u4ef6\u751f\u547d\u5468\u671f\u6d41\u7a0b\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"772\" height=\"1024\" src=\"http:\/\/www.ponybai.com\/wp-content\/uploads\/2023\/12\/render-772x1024.png\" alt=\"\" class=\"wp-image-3838\" srcset=\"http:\/\/www.ponybai.com\/wp-content\/uploads\/2023\/12\/render-772x1024.png 772w, http:\/\/www.ponybai.com\/wp-content\/uploads\/2023\/12\/render-226x300.png 226w, http:\/\/www.ponybai.com\/wp-content\/uploads\/2023\/12\/render-768x1018.png 768w, http:\/\/www.ponybai.com\/wp-content\/uploads\/2023\/12\/render.png 774w\" sizes=\"(max-width: 772px) 100vw, 772px\" \/><\/figure>\n\n\n\n<p>\u6b64\u56fe\u663e\u793a\u4e86\u4ece DOM \u4e2d\u5220\u9664\u7ec4\u4ef6\u5b9e\u4f8b\u65f6\u53d1\u751f\u7684\u60c5\u51b5\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img decoding=\"async\" width=\"219\" height=\"576\" src=\"http:\/\/www.ponybai.com\/wp-content\/uploads\/2023\/12\/disconnect.png\" alt=\"\" class=\"wp-image-3839\" style=\"width:219px;height:auto\" srcset=\"http:\/\/www.ponybai.com\/wp-content\/uploads\/2023\/12\/disconnect.png 219w, http:\/\/www.ponybai.com\/wp-content\/uploads\/2023\/12\/disconnect-114x300.png 114w\" sizes=\"(max-width: 219px) 100vw, 219px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"run-code-when-a-component-is-created\">\u521b\u5efa\u7ec4\u4ef6\u65f6\u8fd0\u884c\u4ee3\u7801<\/h2>\n\n\n\n<p>\u8be5\u65b9\u6cd5\u5728\u521b\u5efa\u7ec4\u4ef6\u5b9e\u4f8b\u65f6\u89e6\u53d1\u3002\u4e0d\u8981\u5728\u6784\u9020\u8fc7\u7a0b\u4e2d\u5411 host \u5143\u7d20\u6dfb\u52a0\u5c5e\u6027\u3002\u60a8\u53ef\u4ee5\u5728\u4efb\u4f55\u5176\u4ed6\u751f\u547d\u5468\u671f\u6302\u94a9\u4e2d\u5411 host \u5143\u7d20\u6dfb\u52a0\u5c5e\u6027\u3002<code>constructor()<\/code><\/p>\n\n\n\n<p>\u6784\u9020\u51fd\u6570\u4ece\u7236\u7ea7\u6d41\u5411\u5b50\u7ea7\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u6784\u9020\u51fd\u6570\u6ce8\u610f\u4e8b\u9879<\/h2>\n\n\n\n<p>HTML\uff1a Custom elements \u89c4\u8303\u4e2d\u7684\u8fd9\u4e9b\u8981\u6c42\u9002\u7528\u4e8e .<code>constructor()<\/code><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7b2c\u4e00\u4e2a\u8bed\u53e5\u5fc5\u987b\u4e0d\u5e26\u53c2\u6570\u3002\u6b64\u8c03\u7528\u4e3a \u5efa\u7acb\u6b63\u786e\u7684\u539f\u578b\u94fe\u548c\u503c\u3002\u5728\u89e6\u6478\u4e4b\u524d\u52a1\u5fc5\u5148\u6253\u7535\u8bdd\u3002<code>super()<\/code><code>this<\/code><code>super()<\/code><code>this<\/code><\/li>\n\n\n\n<li>\u4e0d\u8981\u5728\u6784\u9020\u51fd\u6570\u4e3b\u4f53\u4e2d\u4f7f\u7528\u8bed\u53e5\uff0c\u9664\u975e\u5b83\u662f\u7b80\u5355\u7684\u63d0\u524d\u8fd4\u56de \uff08 \u6216 \uff09\u3002<code>return<\/code><code>return<\/code><code>return this<\/code><\/li>\n\n\n\n<li>\u4e0d\u8981\u4f7f\u7528 or \u65b9\u6cd5\u3002<code>document.write()<\/code><code>document.open()<\/code><\/li>\n\n\n\n<li>\u4e0d\u8981\u68c0\u67e5\u5143\u7d20\u7684\u5c5e\u6027\u548c\u5b50\u5143\u7d20\uff0c\u56e0\u4e3a\u5b83\u4eec\u5c1a\u4e0d\u5b58\u5728\u3002<\/li>\n\n\n\n<li>\u4e0d\u8981\u68c0\u67e5\u5143\u7d20\u7684\u516c\u5171\u5c5e\u6027\uff0c\u56e0\u4e3a\u5b83\u4eec\u662f\u5728\u521b\u5efa\u7ec4\u4ef6\u540e\u8bbe\u7f6e\u7684\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e0d\u8981\u5728\u6784\u9020\u8fc7\u7a0b\u4e2d\u5411\u4e3b\u673a\u5143\u7d20\u6dfb\u52a0\u5c5e\u6027<\/h2>\n\n\n\n<p>\u60a8\u53ef\u4ee5\u5728\u7ec4\u4ef6\u751f\u547d\u5468\u671f\u7684\u4efb\u4f55\u9636\u6bb5\uff08\u6784\u9020\u9664\u5916\uff09\u5411\u4e3b\u673a\u5143\u7d20\u6dfb\u52a0\u5c5e\u6027\u3002<\/p>\n\n\n\n<p>\u4e0d\u5efa\u8bae\u4f7f\u7528\u6b64\u6a21\u5f0f\uff0c\u56e0\u4e3a\u5b83\u4f1a\u5411 host \u5143\u7d20\u6dfb\u52a0\u4e00\u4e2a\u5c5e\u6027\u3002<code>constructor()<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ don't do this\nimport { LightningElement } from \"lwc\";\nexport default class Deprecated extends LightningElement {\n  constructor() {\n    super();\n    this.classList.add(\"new-class\");\n  }\n}<\/code><\/pre>\n\n\n\n<p>\u82e5\u8981\u5411 host \u5143\u7d20\u6dfb\u52a0\u5c5e\u6027\uff0c\u8bf7\u6539\u7528\u8be5\u65b9\u6cd5\u3002<code>connectedCallback()<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import { LightningElement } from \"lwc\";\n\nexport default class New extends LightningElement {\n  connectedCallback() {\n    this.classList.add(\"new-class\");\n  }\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"run-code-when-a-component-is-inserted-or-removed-from-the-dom\">\u5728 DOM \u4e2d\u63d2\u5165\u6216\u5220\u9664\u7ec4\u4ef6\u65f6\u8fd0\u884c\u4ee3\u7801<\/h2>\n\n\n\n<p>\u5f53\u7ec4\u4ef6\u63d2\u5165\u5230 DOM \u4e2d\u65f6\uff0c\u751f\u547d\u5468\u671f\u94a9\u5b50\u4f1a\u89e6\u53d1\u3002\u5f53\u7ec4\u4ef6\u4ece DOM \u4e2d\u5220\u9664\u65f6\uff0c\u751f\u547d\u5468\u671f\u6302\u94a9\u4f1a\u89e6\u53d1\u3002<code>connectedCallback()<\/code><code>disconnectedCallback()<\/code><\/p>\n\n\n\n<p>\u4e24\u4e2a\u94a9\u5b50\u90fd\u4ece\u7236\u7ea7\u6d41\u5411\u5b50\u7ea7\u3002\u60a8\u65e0\u6cd5\u4ece\u56de\u8c03\u8bbf\u95ee\u5b50\u5143\u7d20\uff0c\u56e0\u4e3a\u5b83\u4eec\u5c1a\u4e0d\u5b58\u5728\u3002\u8981\u8bbf\u95ee host \u5143\u7d20\uff0c\u8bf7\u4f7f\u7528 .\u8981\u8bbf\u95ee\u7ec4\u4ef6\u6a21\u677f\u4e2d\u7684\u5143\u7d20\uff0c\u8bf7\u4f7f\u7528 .<code>this<\/code><code>this.template<\/code><\/p>\n\n\n\n<p>\u7528\u4e8e\u4e0e\u7ec4\u4ef6\u7684\u73af\u5883\u8fdb\u884c\u4ea4\u4e92\u3002\u4f8b\u5982\uff0c\u4f7f\u7528\u5b83\u6765\uff1a<code>connectedCallback()<\/code><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4e0e\u5f53\u524d\u6587\u6863\u6216\u5bb9\u5668\u5efa\u7acb\u901a\u4fe1\uff0c\u5e76\u534f\u8c03\u4e0e\u73af\u5883\u7684\u884c\u4e3a\u3002<\/li>\n\n\n\n<li>\u6267\u884c\u521d\u59cb\u5316\u4efb\u52a1\uff0c\u4f8b\u5982\u83b7\u53d6\u6570\u636e\u3001\u8bbe\u7f6e\u7f13\u5b58\u6216\u4fa6\u542c\u4e8b\u4ef6<\/li>\n\n\n\n<li>\u8ba2\u9605\u548c\u53d6\u6d88\u8ba2\u9605\u6d88\u606f\u901a\u9053\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u94a9\u5b50\u662f\u4f7f\u7528\u4f20\u9012\u7ed9\u7ec4\u4ef6\u7684\u521d\u59cb\u5c5e\u6027\u8c03\u7528\u7684\u3002\u5982\u679c\u7ec4\u4ef6\u4ece\u5c5e\u6027\u6d3e\u751f\u5176\u5185\u90e8\u72b6\u6001\uff0c\u5219\u6700\u597d\u5728 setter \u4e2d\u7f16\u5199\u903b\u8f91\uff0c\u800c\u4e0d\u662f\u5728 \u4e2d\u7f16\u5199\u903b\u8f91\u3002\u6709\u5173\u793a\u4f8b\u4ee3\u7801\uff0c\u8bf7\u53c2\u9605 Salesforce \u5de5\u7a0b\u5e08 Pierre-Marie Dartus \u64b0\u5199\u7684\u8fd9\u7bc7\u00a0StackExchange \u6587\u7ae0\u3002<code>connectedCallback()connectedCallback()<\/code><\/p>\n\n\n\n<p>\u94a9\u5b50\u53ef\u4ee5\u53d1\u5c04\u4e0d\u6b62\u4e00\u6b21\u3002\u4f8b\u5982\uff0c\u5982\u679c\u5220\u9664\u4e00\u4e2a\u5143\u7d20\uff0c\u7136\u540e\u5c06\u5176\u63d2\u5165\u5230\u53e6\u4e00\u4e2a\u4f4d\u7f6e\uff0c\u4f8b\u5982\u5728\u5bf9\u5217\u8868\u91cd\u65b0\u6392\u5e8f\u65f6\uff0c\u6302\u94a9\u4f1a\u89e6\u53d1\u51e0\u6b21\u3002\u5982\u679c\u5e0c\u671b\u4ee3\u7801\u8fd0\u884c\u4e00\u6b21\uff0c\u8bf7\u7f16\u5199\u4ee3\u7801\u4ee5\u9632\u6b62\u5176\u8fd0\u884c\u4e24\u6b21\u3002<code>connectedCallback()<\/code><\/p>\n\n\n\n<p>\u7528\u4e8e\u6e05\u7406 \u4e2d\u5b8c\u6210\u7684\u5de5\u4f5c\uff0c\u4f8b\u5982\u6e05\u9664\u7f13\u5b58\u6216\u5220\u9664\u4e8b\u4ef6\u4fa6\u542c\u5668\u3002<code>disconnectedCallback()connectedCallback()<\/code><\/p>\n\n\n\n<p>\u8981\u68c0\u67e5\u7ec4\u4ef6\u662f\u5426\u8fde\u63a5\u5230 DOM\uff0c\u53ef\u4ee5\u4f7f\u7528\u00a0<code>this.isConnected<\/code>\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"run-code-when-a-component-renders\">\u5728\u7ec4\u4ef6\u5448\u73b0\u65f6\u8fd0\u884c\u4ee3\u7801<\/h2>\n\n\n\n<p>\u8fd9\u662f Lightning Web \u7ec4\u4ef6\u6240\u72ec\u6709\u7684\u3002\u4f7f\u7528\u5b83\u5728\u7ec4\u4ef6\u5b8c\u6210\u6e32\u67d3\u9636\u6bb5\u540e\u6267\u884c\u903b\u8f91\u3002<code>renderedCallback()<\/code><\/p>\n\n\n\n<p>\u6b64\u6302\u94a9\u4ece\u5b50\u7ea7\u6d41\u5411\u7236\u7ea7\u3002<\/p>\n\n\n\n<p>\u5f53\u7ec4\u4ef6\u5448\u73b0\u65f6\uff0c\u5c06\u91cd\u65b0\u8ba1\u7b97\u6a21\u677f\u4e2d\u4f7f\u7528\u7684\u8868\u8fbe\u5f0f\u3002<\/p>\n\n\n\n<p>\u8fde\u63a5\u5e76\u6e32\u67d3\u7ec4\u4ef6\u540e\uff0c\u5bf9\u7ec4\u4ef6\u72b6\u6001\u7684\u66f4\u6539\uff08\u6216\u7a81\u53d8\uff09\u4f1a\u5c06\u7ec4\u4ef6\u6807\u8bb0\u4e3a\u810f\u7ec4\u4ef6\uff0c\u5e76\u5c06\u5fae\u4efb\u52a1\u6392\u5165\u961f\u5217\u4ee5\u91cd\u65b0\u6e32\u67d3\u7ec4\u4ef6\u3002\u6709\u5173\u8ddf\u8e2a\u54ea\u4e9b\u66f4\u6539\u7684\u8be6\u7ec6\u4fe1\u606f\uff0c\u8bf7\u53c2\u9605\u53cd\u5e94\u6027\u3002<\/p>\n\n\n\n<p>\u5728\u5e94\u7528\u7a0b\u5e8f\u7684\u751f\u547d\u5468\u671f\u4e2d\uff0c\u7ec4\u4ef6\u901a\u5e38\u4f1a\u5448\u73b0\u591a\u6b21\u3002\u8981\u4f7f\u7528\u6b64\u94a9\u5b50\u6267\u884c\u4e00\u6b21\u6027\u64cd\u4f5c\uff0c\u8bf7\u4f7f\u7528\u5e03\u5c14\u5b57\u6bb5 like \u6765\u8ddf\u8e2a\u662f\u5426\u5df2\u6267\u884c\u3002\u7b2c\u4e00\u6b21\u6267\u884c\u65f6\uff0c\u6267\u884c\u4e00\u6b21\u6027\u64cd\u4f5c\u5e76\u8bbe\u7f6e .\u5982\u679c \uff0c\u5219\u4e0d\u6267\u884c\u8be5\u64cd\u4f5c\u3002<code>hasRendered<\/code><code>renderedCallback()<\/code><code>renderedCallback()<\/code><code>hasRendered = true<\/code><code>hasRendered = true<\/code><\/p>\n\n\n\n<p>\u6700\u597d\u5728\u00a0HTML \u6a21\u677f\u4e2d\u4ee5\u58f0\u660e\u65b9\u5f0f\u6dfb\u52a0\u4e8b\u4ef6\u4fa6\u542c\u5668\u3002\u4f46\u662f\uff0c\u5982\u679c\u786e\u5b9e\u9700\u8981\u4ee5\u7f16\u7a0b\u65b9\u5f0f\u5411\u6a21\u677f\u5143\u7d20\u6dfb\u52a0\u4e8b\u4ef6\u4fa6\u542c\u5668\uff0c\u8bf7\u5728 \u4e2d\u6267\u884c\u6b64\u64cd\u4f5c\u3002\u60a8\u65e0\u9700\u5220\u9664\u4fa6\u542c\u5668\u3002\u5982\u679c\u5c06\u4fa6\u542c\u5668\u91cd\u590d\u6dfb\u52a0\u5230\u540c\u4e00\u5143\u7d20\u4e2d\uff0c\u6d4f\u89c8\u5668\u5c06\u5ffd\u7565\u91cd\u590d\u9879\u3002<code>renderedCallback()<\/code><\/p>\n\n\n\n<p>\u91cd\u65b0\u5448\u73b0\u6a21\u677f\u65f6\uff0cLWC \u5f15\u64ce\u4f1a\u5c1d\u8bd5\u91cd\u7528\u73b0\u6709\u5143\u7d20\u3002\u5728\u4ee5\u4e0b\u60c5\u51b5\u4e0b\uff0c\u5f15\u64ce\u4f7f\u7528\u5dee\u5f02\u7b97\u6cd5\u6765\u51b3\u5b9a\u662f\u5426\u4e22\u5f03\u5143\u7d20\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528\u00a0<code>for\uff1aeach<\/code>\u00a0\u6307\u4ee4\u521b\u5efa\u7684\u5143\u7d20\u3002\u91cd\u7528\u8fd9\u4e9b\u8fed\u4ee3\u5143\u7d20\u7684\u51b3\u5b9a\u53d6\u51b3\u4e8e\u5c5e\u6027\u3002\u5982\u679c\u53d1\u751f\u66f4\u6539\uff0c\u5219\u5143\u7d20\u53ef\u80fd\u4f1a\u88ab\u91cd\u65b0\u5448\u73b0\u3002\u5982\u679c\u672a\u66f4\u6539\uff0c\u5219\u4e0d\u4f1a\u91cd\u65b0\u5448\u73b0\u5143\u7d20\uff0c\u56e0\u4e3a\u5f15\u64ce\u5047\u5b9a\u8fed\u4ee3\u5143\u7d20\u672a\u66f4\u6539\u3002<code>keykeykey<\/code><\/li>\n\n\n\n<li>\u4f5c\u4e3a\u69fd\u5185\u5bb9\u63a5\u6536\u7684\u5143\u7d20\u3002\u5f15\u64ce\u5c1d\u8bd5\u91cd\u7528 \u4e2d\u7684\u5143\u7d20\uff0c\u4f46\u5dee\u5f02\u7b97\u6cd5\u786e\u5b9a\u662f\u5426\u9010\u51fa\u5143\u7d20\u5e76\u91cd\u65b0\u521b\u5efa\u5b83\u3002<code>&lt;slot><\/code><\/li>\n<\/ul>\n\n\n\n<p>\u66f4\u65b0\u7ec4\u4ef6\u7684\u72b6\u6001\u53ef\u80fd\u4f1a\u5bfc\u81f4\u65e0\u9650\u5faa\u73af\u3002\u4f8b\u5982\uff1a<code>renderedCallback()<\/code><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4e0d\u8981\u66f4\u65b0 \u4e2d\u7684\u7535\u7ebf\u9002\u914d\u5668\u914d\u7f6e\u5bf9\u8c61\u5c5e\u6027\u3002\u8bf7\u53c2\u9605\u4e86\u89e3 Wire Service\u3002<code>renderedCallback()<\/code><\/li>\n\n\n\n<li>\u4e0d\u8981\u66f4\u65b0 \u4e2d\u7684\u516c\u5171\u5c5e\u6027\u6216\u5b57\u6bb5\u3002\u8bf7\u53c2\u9605\u53cd\u5e94\u6027\u3002<code>renderedCallback()<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u63d0\u793a<\/p>\n\n\n\n<p>lwc-recipes\u00a0samples \u5b58\u50a8\u5e93\u4e2d\u7684\u6a21\u5757\u4f7f\u7528 lifecycle hook\u3002<code>libsChartjsrenderedCallback()<\/code><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"handle-component-errors\">\u5904\u7406\u7ec4\u4ef6\u9519\u8bef<\/h2>\n\n\n\n<p>\u8fd9\u662f Lightning Web \u7ec4\u4ef6\u6240\u72ec\u6709\u7684\u3002\u5b9e\u73b0\u5b83\u4ee5\u521b\u5efa\u4e00\u4e2a\u9519\u8bef\u8fb9\u754c\u7ec4\u4ef6\uff0c\u8be5\u7ec4\u4ef6\u6355\u83b7\u5176\u6811\u4e2d\u6240\u6709\u540e\u4ee3\u7ec4\u4ef6\u4e2d\u7684\u9519\u8bef\u3002\u5b83\u6355\u83b7\u5728\u540e\u4ee3\u7684\u751f\u547d\u5468\u671f\u6302\u94a9\u4e2d\u6216\u5728 HTML \u6a21\u677f\u4e2d\u58f0\u660e\u7684\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u671f\u95f4\u53d1\u751f\u7684\u9519\u8bef\u3002\u60a8\u53ef\u4ee5\u5bf9\u9519\u8bef\u8fb9\u754c\u7ec4\u4ef6\u8fdb\u884c\u7f16\u7801\uff0c\u4ee5\u8bb0\u5f55\u5806\u6808\u4fe1\u606f\u5e76\u5448\u73b0\u66ff\u4ee3\u89c6\u56fe\uff0c\u4ee5\u544a\u77e5\u7528\u6237\u53d1\u751f\u4e86\u4ec0\u4e48\u4ee5\u53ca\u4e0b\u4e00\u6b65\u8981\u505a\u4ec0\u4e48\u3002<code>errorCallback()<\/code><\/p>\n\n\n\n<p>\u60a8\u53ef\u4ee5\u521b\u5efa\u9519\u8bef\u8fb9\u754c\u7ec4\u4ef6\uff0c\u5e76\u5728\u6574\u4e2a\u5e94\u7528\u4e2d\u91cd\u590d\u4f7f\u7528\u5b83\u3002\u7531\u60a8\u51b3\u5b9a\u5728\u54ea\u91cc\u5b9a\u4e49\u8fd9\u4e9b\u9519\u8bef\u8fb9\u754c\u3002\u60a8\u53ef\u4ee5\u5305\u88c5\u6574\u4e2a\u5e94\u7528\u7a0b\u5e8f\uff0c\u4e5f\u53ef\u4ee5\u5305\u88c5\u6bcf\u4e2a\u5355\u72ec\u7684\u7ec4\u4ef6\u3002\u6700\u6709\u53ef\u80fd\u7684\u662f\uff0c\u4f60\u7684\u67b6\u6784\u4ecb\u4e8e\u4e24\u8005\u4e4b\u95f4\u3002\u60f3\u4e00\u60f3\u4f60\u60f3\u5728\u4ec0\u4e48\u5730\u65b9\u544a\u8bc9\u7528\u6237\u51fa\u4e86\u95ee\u9898\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- boundary.html --&gt;\n&lt;template&gt;\n  &lt;template lwc:if={error}&gt;\n    &lt;error-view error={error} info={stack}&gt;&lt;\/error-view&gt;\n  &lt;\/template&gt;\n  &lt;template lwc:else&gt;\n    &lt;healthy-view&gt;&lt;\/healthy-view&gt;\n  &lt;\/template&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ boundary.js\nimport { LightningElement } from \"lwc\";\nexport default class Boundary extends LightningElement {\n  error;\n  stack;\n  errorCallback(error, stack) {\n    this.error = error;\n  }\n}<\/code><\/pre>\n\n\n\n<p>\u53c2\u6570\u662f JavaScript 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