{"id":3797,"date":"2024-01-03T21:44:18","date_gmt":"2024-01-03T13:44:18","guid":{"rendered":"http:\/\/www.ponybai.com\/?p=3797"},"modified":"2023-11-29T21:57:04","modified_gmt":"2023-11-29T13:57:04","slug":"%e5%88%9b%e5%bb%ba-lightning-web-%e7%bb%84%e4%bb%b6","status":"publish","type":"post","link":"http:\/\/www.ponybai.com\/?p=3797","title":{"rendered":"\u521b\u5efa Lightning Web \u7ec4\u4ef6"},"content":{"rendered":"\n<p>Lightning Web \u7ec4\u4ef6\u662f\u5177\u6709\u81ea\u5df1\u7684 API \u7684\u53ef\u91cd\u7528\u81ea\u5b9a\u4e49 HTML \u5143\u7d20\u3002<\/p>\n\n\n\n<p>\u8bf7\u67e5\u770b\u8fd9\u4e9b\u90e8\u5206\uff0c\u4e86\u89e3\u6709\u5173\u521b\u5efa\u81ea\u5df1\u7684 Lightning Web \u7ec4\u4ef6\u7684\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5b9a\u4e49\u7ec4\u4ef6<\/li>\n\n\n\n<li>HTML \u6a21\u677f<\/li>\n\n\n\n<li>CSS\u7684<\/li>\n\n\n\n<li>\u7ec4\u6210<\/li>\n\n\n\n<li>\u5b57\u6bb5\u3001\u5c5e\u6027\u548c\u7279\u6027<\/li>\n\n\n\n<li>Javascript\u7684<\/li>\n\n\n\n<li>\u8bbf\u95ee Salesforce \u8d44\u6e90<\/li>\n\n\n\n<li>\u7ec4\u4ef6\u53ef\u8bbf\u95ee\u6027<\/li>\n\n\n\n<li>\u751f\u547d\u5468\u671f\u94a9\u5b50<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"define-a-component\">\u5b9a\u4e49\u7ec4\u4ef6<\/h1>\n\n\n\n<p>\u5448\u73b0 UI \u7684 Lightning Web \u7ec4\u4ef6\u5fc5\u987b\u5305\u542b HTML \u6587\u4ef6\u3001JavaScript \u6587\u4ef6\u548c\u5143\u6570\u636e\u914d\u7f6e\u6587\u4ef6\u3002\u8fd9\u4e9b\u6587\u4ef6\u5fc5\u987b\u4f7f\u7528\u76f8\u540c\u7684\u540d\u79f0\uff0c\u4ee5\u4fbf\u6846\u67b6\u53ef\u4ee5\u81ea\u52a8\u8fde\u63a5\u5b83\u4eec\u3002\u670d\u52a1\u7ec4\u4ef6\uff08\u5e93\uff09\u5fc5\u987b\u5305\u542b JavaScript \u6587\u4ef6\u548c\u5143\u6570\u636e\u914d\u7f6e\u6587\u4ef6\u3002<\/p>\n\n\n\n<p><strong>\u53e6\u89c1<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Lightning Web \u7ec4\u4ef6\u89c6\u9891\u5e93\uff1aLWC \u5256\u6790<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"html-templates\">HTML \u6a21\u677f<\/h1>\n\n\n\n<p>Lightning Web \u7ec4\u4ef6\u7684\u5f3a\u5927\u4e4b\u5904\u5728\u4e8e\u6a21\u677f\u7cfb\u7edf\uff0c\u5b83\u4f7f\u7528\u865a\u62df DOM \u6765\u667a\u80fd\u9ad8\u6548\u5730\u6e32\u67d3\u7ec4\u4ef6\u3002\u6700\u597d\u7684\u505a\u6cd5\u662f\u8ba9 LWC \u64cd\u4f5c DOM\uff0c\u800c\u4e0d\u662f\u7f16\u5199 JavaScript \u6765\u6267\u884c\u6b64\u64cd\u4f5c\u3002<\/p>\n\n\n\n<p>\u5728 HTML \u6a21\u677f\u4e2d\u4f7f\u7528\u6839\u6807\u8bb0\u3002\u60a8\u8fd8\u53ef\u4ee5\u4f7f\u7528\u5d4c\u5957\u6807\u8bb0\u6765\u5904\u7406\u6307\u4ee4\u3002<code>&lt;template&gt;&lt;template&gt;<\/code><\/p>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"use-html-templates\">\u4f7f\u7528 HTML \u6a21\u677f<\/h1>\n\n\n\n<p>\u4f7f\u7528\u6807\u51c6 HTML \u548c\u4e00\u4e9b Lightning Web \u7ec4\u4ef6\u7279\u6709\u7684\u6307\u4ee4\u7f16\u5199\u6a21\u677f\u3002<\/p>\n\n\n\n<p>\u5f53\u7ec4\u4ef6\u5448\u73b0\u65f6\uff0c\u6807\u8bb0\u5c06\u66ff\u6362\u4e3a\u7ec4\u4ef6\u7684\u540d\u79f0 \u3002<code>&lt;template&gt;<\/code><code>&lt;namespace-component-name&gt;<\/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 World&lt;\/div&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<p>\u4f8b\u5982\uff0c\u5728\u6d4f\u89c8\u5668\u63a7\u5236\u53f0\u4e2d\uff0c\u5e26\u6709\u6a21\u677f\u7684\u7ec4\u4ef6\u5448\u73b0\u4e3a \uff0c\u5176\u4e2d \u662f\u9ed8\u8ba4\u547d\u540d\u7a7a\u95f4\u3002<code>myComponent.html<\/code><code>&lt;c-my-component&gt;<\/code><code>c<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;c-my-component&gt;\n  &lt;div class=\"slds-var-m-around_medium\"&gt;Hello, World!&lt;\/div&gt;\n&lt;\/c-my-component&gt;<\/code><\/pre>\n\n\n\n<p>HTML \u6a21\u677f\u8fd8\u5c06\u6570\u636e\u5448\u73b0\u7ed9 DOM\u3002 \u4f7f\u7528\u7b80\u5355\u7684\u8bed\u6cd5\u4ee5\u58f0\u660e\u65b9\u5f0f\u5c06\u7ec4\u4ef6\u7684\u6a21\u677f\u7ed1\u5b9a\u5230\u7ec4\u4ef6\u7684 JavaScript \u7c7b\u4e2d\u7684\u6570\u636e\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5d4c\u5957\u6a21\u677f<\/h2>\n\n\n\n<p>\u6a21\u677f\u53ef\u4ee5\u5305\u542b\u5e26\u6709\u6307\u4ee4\u7684\u5d4c\u5957\u6807\u8bb0\u3002<code>&lt;template&gt;<\/code><\/p>\n\n\n\n<p>\u6307\u4ee4\u662f\u7279\u6b8a\u7684 HTML \u5c5e\u6027\uff0c\u5982 \u548c \uff0c\u5b83\u8d4b\u4e88\u60a8\u5728\u6807\u8bb0\u4e2d\u64cd\u4f5c DOM \u7684\u66f4\u591a\u6743\u529b\u3002<code>lwc:if<\/code><code>for:each<\/code><\/p>\n\n\n\n<p>\u5d4c\u5957\u6807\u8bb0\u5fc5\u987b\u5305\u542b\u4ee5\u4e0b\u6307\u4ee4\u4e4b\u4e00\uff1a\u3001\u3001\u6216 \u3002<code>&lt;template&gt;<\/code><code>for:each<\/code><code>iterator:iteratorName<\/code><code>lwc:if<\/code><code>lwc:else<\/code><code>lwc:elseif<\/code><code>if:true|false<\/code><\/p>\n\n\n\n<p>\u6ce8\u610f<\/p>\n\n\n\n<p>\u5d4c\u5957\u6807\u8bb0\u4e0d\u80fd\u4e0e\u5176\u4ed6\u6307\u4ee4\u6216 HTML \u5c5e\u6027\u4e00\u8d77\u4f7f\u7528\u3002\u65e0\u6548\u7684\u6a21\u677f\u7528\u6cd5\u5c06\u88ab\u5ffd\u7565 &#8211; \u6a21\u677f\u53ca\u5176\u5b50\u7ea7\u4e0d\u4f1a\u5728 DOM \u4e2d\u5448\u73b0\uff0c\u5e76\u4e14\u5728\u52a0\u8f7d\u7ec4\u4ef6\u65f6\u4f1a\u8fd4\u56de\u8b66\u544a\u3002<code>&lt;template&gt;<\/code><\/p>\n\n\n\n<p>\u4f8b\u5982\uff0c\u4e0d\u8981\u5728\u5d4c\u5957\u6807\u7b7e\u4e0a\u4f7f\u7528\u8be5\u5c5e\u6027\uff0c\u800c\u662f\u5728 or \u6807\u7b7e\u4e0a\u4f7f\u7528\u8be5\u5c5e\u6027\u3002<code>class<\/code><code>&lt;template&gt;<\/code><code>class<\/code><code>&lt;div&gt;<\/code><code>&lt;span&gt;<\/code><\/p>\n\n\n\n<p>\u63d0\u793a<\/p>\n\n\n\n<p>\u5982\u679c\u60a8\u4f7f\u7528 VS Code\uff0c\u6211\u4eec\u5efa\u8bae\u60a8\u5b89\u88c5&nbsp;Salesforce \u6269\u5c55\u5305\u3002\u6b64\u6269\u5c55\u4f1a\u5728\u60a8\u952e\u5165\u65f6\u6807\u8bb0\u683c\u5f0f\u9519\u8bef\u6216\u4e0d\u6b63\u786e\u7684\u4ee3\u7801\uff0c\u8fd9\u5728\u4f7f\u7528\u6a21\u677f\u6307\u4ee4\u65f6\u5f88\u6709\u5e2e\u52a9\u3002<\/p>\n\n\n\n<p>\u6709\u5173\u6839\u6807\u8bb0\u6216\u5d4c\u5957\u6807\u8bb0\u652f\u6301\u54ea\u4e9b\u6307\u4ee4\u7684\u8be6\u7ec6\u4fe1\u606f\uff0c\u8bf7\u53c2\u9605&nbsp;HTML \u6a21\u677f\u6307\u4ee4\u3002<code>&lt;template&gt;<\/code><\/p>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"data-binding-in-a-template\">\u6a21\u677f\u4e2d\u7684\u6570\u636e\u7ed1\u5b9a<\/h1>\n\n\n\n<p>\u5c06\u7ec4\u4ef6\u6a21\u677f\u4e2d\u7684\u5c5e\u6027\u7ed1\u5b9a\u5230\u7ec4\u4ef6\u7684 JavaScript \u7c7b\u4e2d\u7684\u5c5e\u6027\u3002<\/p>\n\n\n\n<p>\u5728\u6a21\u677f\u4e2d\uff0c\u7528\u4e0d\u5e26\u7a7a\u683c\u7684\u5927\u62ec\u53f7\u5c06\u5c5e\u6027\u62ec\u8d77\u6765\uff1a.\u82e5\u8981\u8ba1\u7b97\u5c5e\u6027\u7684\u503c\uff0c\u8bf7\u5728 JavaScript \u7c7b&nbsp;<em><code>property<\/code><\/em>&nbsp;\u4e2d\u4f7f\u7528 JavaScript getter\u3002\u5728\u6a21\u677f\u4e2d\uff0c<em><code>\u5c5e\u6027<\/code><\/em>\u53ef\u4ee5\u662f JavaScript \u6807\u8bc6\u7b26\uff08\u4f8b\u5982\uff0c\uff09\uff0c\u4e5f\u53ef\u4ee5\u662f\u4ece\u5bf9\u8c61 \uff08\uff09 \u8bbf\u95ee\u5c5e\u6027\u7684\u70b9\u8868\u793a\u6cd5\u3002LWC \u4e0d\u5141\u8bb8\u4f7f\u7528\u50cf \u8fd9\u6837\u7684\u8ba1\u7b97\u8868\u8fbe\u5f0f\u3002<code>{property}<\/code><code>get<\/code><code>(){}<\/code><code>person<\/code><code>person.firstName<\/code><code>person[2].name['John']<\/code><\/p>\n\n\n\n<p>\u6a21\u677f\u4e2d\u4f7f\u7528\u7684\u5c5e\u6027\u5e94\u5305\u542b\u57fa\u5143\u503c\uff0c\u4f46\u5728&nbsp;<code>for\uff1aeach<\/code>&nbsp;\u6216<code>\u8fed\u4ee3\u5668<\/code>\u6307\u4ee4\u4e2d\u4f7f\u7528\u65f6\u9664\u5916\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u793a\u4f8b\uff1a\u5c06\u7ec4\u4ef6\u6a21\u677f\u5c5e\u6027\u7ed1\u5b9a\u5230 JavaScript \u5c5e\u6027<\/h2>\n\n\n\n<p>\u82e5\u8981\u5728\u4ee3\u7801\u7f16\u8f91\u5668\u4e2d\u7ee7\u7eed\u64cd\u4f5c\uff0c\u8bf7\u6253\u5f00&nbsp;github.com\/trailheadapps\/lwc-recipes&nbsp;\u5b58\u50a8\u5e93\u4e2d\u7684 \u3001 \u548c\u7ec4\u4ef6\u3002\u60a8\u4e5f\u53ef\u4ee5\u5c06\u4ee3\u7801\u590d\u5236\u5230&nbsp;webcomponents.dev\/create\/lwc\u3002<code>hellohelloBindinghelloExpressions<\/code><\/p>\n\n\n\n<p>\u4e0b\u9762\u662f\u6570\u636e\u7ed1\u5b9a\u7684\u6700\u7b80\u5355\u793a\u4f8b\u3002\u6a21\u677f\u4e2d\u7684\u5c5e\u6027\u7ed1\u5b9a\u5230 JavaScript \u7c7b\u4e2d\u7684\u5c5e\u6027\u3002<code>greeting<\/code><code>greeting<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- hello.html --&gt;\n&lt;template&gt; Hello, {greeting}! &lt;\/template&gt;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ hello.js\nimport { LightningElement } from \"lwc\";\n\nexport default class Hello extends LightningElement {\n  greeting = \"World\";\n}<\/code><\/pre>\n\n\n\n<p>\u4e2d\u7684\u5c5e\u6027\u5fc5\u987b\u662f\u6709\u6548\u7684 JavaScript \u6807\u8bc6\u7b26\u6216\u6210\u5458\u8868\u8fbe\u5f0f\u3002\u4f8b\u5982\uff0c\u548c \u90fd\u6709\u6548\u3002\u4e0d\u8981\u5728\u5c5e\u6027\u5468\u56f4\u6dfb\u52a0\u7a7a\u683c\uff0c\u4f8b\u5982\uff0c\u4e0d\u662f\u6709\u6548\u7684 HTML\u3002<code>{ }<\/code><code>{data}<\/code><code>{data.name}<\/code><code>{ data }<\/code><\/p>\n\n\n\n<p>\u6b64\u7ec4\u4ef6\u6ca1\u6709\u786c\u7f16\u7801\u5b57\u7b26\u4e32\uff0c\u800c\u662f\u5177\u6709\u4e00\u4e2a\u8f93\u5165\u5b57\u6bb5\uff0c\u8be5\u5b57\u6bb5\u8981\u6c42\u63d0\u4f9b\u8981\u95ee\u5019\u7684\u540d\u79f0\u3002<\/p>\n\n\n\n<p>\u8be5\u5b57\u6bb5\u4f7f\u7528\u8be5\u5c5e\u6027\u6765\u4fa6\u542c\u5176\u503c\u7684\u66f4\u6539\u3002\u5f53\u503c\u66f4\u6539\u65f6\uff0c\u5c06\u6267\u884c JavaScript \u6587\u4ef6\u4e2d\u7684\u51fd\u6570\u3002\u8bf7\u6ce8\u610f\uff0c\u8981\u5c06\u51fd\u6570\u7ed1\u5b9a\u5230\u6a21\u677f\uff0c\u6211\u4eec\u4f7f\u7528\u76f8\u540c\u7684\u8bed\u6cd5\uff0c<code>lightning-input<\/code><code>onchange<\/code><code>handleChange<\/code><code>handleChange<\/code><code>{handleChange}<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- helloBinding.html --&gt;\n&lt;template&gt;\n  &lt;p&gt;Hello, {greeting}!&lt;\/p&gt;\n  &lt;lightning-input label=\"Name\" value={greeting} onchange={handleChange}&gt;&lt;\/lightning-input&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<p>\u6211\u4eec\u5728\u53e6\u4e00\u4e2a\u4e3b\u9898\u4e2d\u6df1\u5165\u8ba8\u8bba\u4e8b\u4ef6\u5904\u7406\uff0c\u4f46\u8bf7\u6ce8\u610f\uff0c\u5728 JavaScript \u7c7b\u4e2d\u4f20\u9012\u4e86\u4e00\u4e2a\u5bf9\u8c61\u3002\u8be5\u5bf9\u8c61\u5305\u542b\u6709\u5173\u66f4\u6539\u4e8b\u4ef6\u7684\u4fe1\u606f\u3002\u8be5\u7ec4\u4ef6\u4f7f\u7528\u8be5\u5bf9\u8c61\u6765\u83b7\u53d6\u7528\u6237\u5728\u8f93\u5165\u5b57\u6bb5\u4e2d\u8f93\u5165\u7684\u503c\u3002<code>handleChangeeventeventevent<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ helloBinding.js\nimport { LightningElement } from \"lwc\";\n\nexport default class HelloBinding extends LightningElement {\n  greeting = \"World\";\n\n  handleChange(event) {\n    this.greeting = event.target.value;\n  }\n}<\/code><\/pre>\n\n\n\n<p>\u8fd9\u4e9b\u4ee3\u7801\u5927\u90e8\u5206\u662f\u6807\u51c6\u7684 HTML \u548c JavaScript\u3002<\/p>\n\n\n\n<p>\u6ce8\u610f<\/p>\n\n\n\n<p>\u5f53\u7ec4\u4ef6\u91cd\u65b0\u5448\u73b0\u65f6\uff0c\u5c06\u91cd\u65b0\u8ba1\u7b97\u6a21\u677f\u4e2d\u4f7f\u7528\u7684\u8868\u8fbe\u5f0f\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f7f\u7528 getter \u4ee3\u66ff\u8868\u8fbe\u5f0f<\/h2>\n\n\n\n<p>\u82e5\u8981\u8ba1\u7b97\u5c5e\u6027\u7684\u503c\uff0c\u8bf7\u4f7f\u7528 JavaScript getter\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u5c06\u540d\u79f0\u8f6c\u6362\u4e3a\u6240\u6709\u5927\u5199\u5b57\u6bcd\uff0c\u8bf7\u5728 JavaScript \u7c7b\u4e2d\u4f7f\u7528 getter \u51fd\u6570\uff0c\u800c\u4e0d\u662f\u6a21\u677f\u4e2d\u7684\u8868\u8fbe\u5f0f\u3002<\/p>\n\n\n\n<p>getter \u6bd4\u8868\u8fbe\u5f0f\u5f3a\u5927\u5f97\u591a\uff0c\u56e0\u4e3a\u5b83\u4eec\u662f JavaScript \u51fd\u6570\u3002Getter \u8fd8\u652f\u6301\u5355\u5143\u6d4b\u8bd5\uff0c\u4ece\u800c\u51cf\u5c11\u9519\u8bef\u5e76\u589e\u52a0\u4e50\u8da3\u3002<\/p>\n\n\n\n<p>\u5b9a\u4e49\u4e00\u4e2a getter \u6765\u8ba1\u7b97 JavaScript \u7c7b\u4e2d\u7684\u503c\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>get propertyName() { ... }<\/code><\/pre>\n\n\n\n<p>\u4ece\u6a21\u677f\u8bbf\u95ee getter\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>{\n  propertyName;\n}<\/code><\/pre>\n\n\n\n<p>\u5728\u6b64\u793a\u4f8b\u4e2d\uff0c\u7528\u6237\u8f93\u5165\u5176\u540d\u5b57\u548c\u59d3\u6c0f\u3002JavaScript getter \u8ba1\u7b97\u4e00\u4e2a\u65b0\u503c\uff0c\u6a21\u677f\u5448\u73b0\u5b83\uff1a<strong>DEANNA LI<\/strong>\u3002<code>uppercasedFullName<\/code><\/p>\n\n\n\n<p>\u6a21\u677f\u4e2d\u7684\u5c5e\u6027\u7ed1\u5b9a\u5230 JavaScript \u7c7b\u4e2d\u7684 getter\u3002<code>uppercasedFullName<\/code><code>get uppercasedFullName()<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- helloExpressions.html --&gt;\n&lt;template&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 name=\"lastName\" label=\"Last Name\" onchange={handleChange}&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;\/template&gt;<\/code><\/pre>\n\n\n\n<p>\u8be5\u51fd\u6570\u5c06 \u548c \u5c5e\u6027\u8bbe\u7f6e\u4e3a\u7528\u6237\u8f93\u5165\u7684\u503c\u3002getter \u5c06\u540d\u79f0\u7ec4\u5408\u5e76\u5927\u5199\u3002<code>handleChange<\/code><code>firstName<\/code><code>lastName<\/code><code>uppercasedFullName()<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ helloExpressions.js\nimport { LightningElement } from \"lwc\";\n\nexport default class HelloExpressions 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}`.toUpperCase();\n  }\n}<\/code><\/pre>\n\n\n\n<p>\u63d0\u793a<\/p>\n\n\n\n<p>\u6240\u6709\u5b57\u6bb5\u90fd\u662f\u53cd\u5e94\u5f0f\u7684\u3002\u5982\u679c\u5b57\u6bb5\u5728\u6a21\u677f\u4e2d\u4f7f\u7528\uff0c\u6216\u95f4\u63a5\u7528\u4e8e\u6a21\u677f\u4e2d\u4f7f\u7528\u7684\u5c5e\u6027\u7684 getter \u4e2d\uff0c\u5219\u5f53\u5c5e\u6027\u7684\u503c\u66f4\u6539\u65f6\uff0c\u7ec4\u4ef6\u5c06\u91cd\u65b0\u5448\u73b0\u3002\u5728\u6b64\u793a\u4f8b\u4e2d\uff0cwhen \u548c change \u4f1a\u91cd\u65b0\u5448\u73b0\u6a21\u677f\uff0c\u56e0\u4e3a\u5b83\u4eec\u5728 getter \u4e2d\u4f7f\u7528\uff0c\u5e76\u4e14\u8be5\u5c5e\u6027\u5728\u6a21\u677f\u4e2d\u4f7f\u7528\u3002\u8bf7\u53c2\u9605\u5b57\u6bb5\u3001\u5bf9\u8c61\u548c\u6570\u7ec4\u7684\u53cd\u5e94\u6027\u3002<code>firstName lastName uppercasedFullName<\/code><\/p>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"render-dom-elements-conditionally\">\u6709\u6761\u4ef6\u5730\u5448\u73b0 DOM \u5143\u7d20<\/h1>\n\n\n\n<p>\u82e5\u8981\u6709\u6761\u4ef6\u5730\u5448\u73b0 HTML\uff0c\u8bf7\u5c06 and \u6307\u4ee4\u6dfb\u52a0\u5230\u5305\u542b\u6761\u4ef6\u5185\u5bb9\u7684\u5d4c\u5957\u6807\u8bb0\u4e2d\u3002<code>lwc:if|elseif={property}<\/code><code>lwc:else<\/code><code>&lt;template&gt;<\/code><\/p>\n\n\n\n<p>\u63d0\u793a<\/p>\n\n\n\n<p>\u6307\u4ee4\u662f\u7279\u6b8a\u7684 HTML \u5c5e\u6027\u3002Lightning Web \u7ec4\u4ef6\u7f16\u7a0b\u6a21\u578b\u5177\u6709\u4e00\u4e9b\u81ea\u5b9a\u4e49\u6307\u4ee4\uff0c\u5141\u8bb8\u60a8\u4f7f\u7528\u6807\u8bb0\u6765\u64cd\u4f5c DOM\u3002<\/p>\n\n\n\n<p>\u8fd9\u4e9b\u6307\u4ee4\u7ed1\u5b9a\u5230\u6a21\u677f\uff0c\u6839\u636e\u6570\u636e\u662f\u771f\u5b9e\u503c\u8fd8\u662f\u865a\u5047\u503c\u6765\u5220\u9664\u548c\u63d2\u5165 DOM \u5143\u7d20\u3002<code>lwc:if|elseif{property}<\/code><\/p>\n\n\n\n<p>\u6ce8\u610f<\/p>\n\n\n\n<p>\u4e0d\u518d\u5efa\u8bae\u4f7f\u7528\u65e7\u6307\u4ee4\u548c\u6307\u4ee4\uff0c\u56e0\u4e3a\u6211\u4eec\u6253\u7b97\u5728\u5c06\u6765\u5f03\u7528\u548c\u5220\u9664\u8fd9\u4e9b\u6307\u4ee4\u3002\u6211\u4eec\u5efa\u8bae\u60a8\u5c06\u5176\u7528\u6761\u4ef6\u6307\u4ee4\u66ff\u6362\u4e3a\u6761\u4ef6\u6307\u4ee4\uff0c\u4ee5\u4f7f\u60a8\u7684\u4ee3\u7801\u9762\u5411\u672a\u6765\u3002<code>if:true<\/code><code>if:false<\/code><code>lwc:if|elseif|else<\/code><\/p>\n\n\n\n<p>\u6b64\u793a\u4f8b\u6709\u4e24\u4e2a\u5c5e\u6027\u548c \u3002<code>property1<\/code><code>property2<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;template&gt;\n  &lt;template lwc:if={property1}&gt; Statement1 &lt;\/template&gt;\n  &lt;template lwc:elseif={property2}&gt; Statement2 &lt;\/template&gt;\n  &lt;template lwc:else&gt; Statement3 &lt;\/template&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<p>\u8fd9\u4e09\u4e2a\u8bed\u53e5\u4e2d\u53ea\u6709\u4e00\u4e2a\u5448\u73b0\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>Statement1<\/code>\u5982\u679c\u4e3a true\uff0c\u5219\u5448\u73b0\u3002<code>property1<\/code><\/li>\n\n\n\n<li><code>Statement2<\/code>\u5982\u679c\u4e3a false\uff0c\u5219\u5448\u73b0 true\u3002<code>property1<\/code><code>property2<\/code><\/li>\n\n\n\n<li><code>Statement3<\/code>\u5448\u73b0 if \u548c are false\u3002<code>property1<\/code><code>property2<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u5c3d\u7ba1\u8be5\u793a\u4f8b\u4f7f\u7528\u6240\u6709\u4e09\u4e2a\u6307\u4ee4\uff0c\u5e76\u4e14\u662f\u53ef\u9009\u7684\u3002<code>lwc:elseif<\/code><code>lwc:else<\/code><\/p>\n\n\n\n<p>\u8ba9\u6211\u4eec\u770b\u53e6\u4e00\u4e2a\u4f8b\u5b50\u3002\u6b64\u6a21\u677f\u5305\u542b\u4e00\u4e2a\u6807\u8bb0\u4e3a<strong>\u201c\u663e\u793a\u8be6\u7ec6\u4fe1\u606f\u201d<\/strong>\u7684\u590d\u9009\u6846\u3002\u5f53\u7528\u6237\u9009\u4e2d\u6216\u53d6\u6d88\u9009\u4e2d\u8be5\u590d\u9009\u6846\u65f6\uff0c\u8be5\u51fd\u6570\u5c06\u8bbe\u7f6e\u5c5e\u6027\u7684\u503c\u3002\u5982\u679c\u5c5e\u6027\u4e3a \uff0c\u5219\u8be5\u6307\u4ee4\u5c06\u5448\u73b0\u5d4c\u5957\u6a21\u677f\uff0c\u8be5\u6a21\u677f\u663e\u793a&nbsp;<strong>These are the details\uff01<\/strong>\u3002<code>handleChange<\/code><code>areDetailsVisible<\/code><code>areDetailsVisible<\/code><code>true<\/code><code>lwc:if<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- helloConditionalRendering.html --&gt;\n&lt;template&gt;\n  &lt;lightning-card title=\"HelloConditionalRendering\" icon-name=\"custom:custom14\"&gt;\n    &lt;div class=\"slds-m-around_medium\"&gt;\n      &lt;lightning-input\n        type=\"checkbox\"\n        label=\"Show details\"\n        onchange={handleChange}\n      &gt;&lt;\/lightning-input&gt;\n      &lt;template lwc:if={areDetailsVisible}&gt;\n        &lt;div class=\"slds-m-vertical_medium\"&gt;These are the details!&lt;\/div&gt;\n      &lt;\/template&gt;\n    &lt;\/div&gt;\n  &lt;\/lightning-card&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<p>\u8bf7\u6ce8\u610f\uff0cJavaScript \u4e0d\u4f1a\u64cd\u4f5c DOM\uff0c\u5b83\u53ea\u662f\u66f4\u6539\u5c5e\u6027\u7684\u503c\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ helloConditionalRendering.js\nimport { LightningElement } from \"lwc\";\n\nexport default class HelloConditionalRendering extends LightningElement {\n  areDetailsVisible = false;\n\n  handleChange(event) {\n    this.areDetailsVisible = event.target.checked;\n  }\n}<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"502\" height=\"90\" src=\"http:\/\/www.ponybai.com\/wp-content\/uploads\/2023\/11\/render_conditional.png\" alt=\"\" class=\"wp-image-3800\" srcset=\"http:\/\/www.ponybai.com\/wp-content\/uploads\/2023\/11\/render_conditional.png 502w, http:\/\/www.ponybai.com\/wp-content\/uploads\/2023\/11\/render_conditional-300x54.png 300w\" sizes=\"(max-width: 502px) 100vw, 502px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"502\" height=\"118\" src=\"http:\/\/www.ponybai.com\/wp-content\/uploads\/2023\/11\/render_conditional_2.png\" alt=\"\" class=\"wp-image-3801\" srcset=\"http:\/\/www.ponybai.com\/wp-content\/uploads\/2023\/11\/render_conditional_2.png 502w, http:\/\/www.ponybai.com\/wp-content\/uploads\/2023\/11\/render_conditional_2-300x71.png 300w\" sizes=\"(max-width: 502px) 100vw, 502px\" \/><\/figure>\n\n\n\n<p>\u6ce8\u610f<\/p>\n\n\n\n<p>\u82e5\u8981\u5728\u6807\u8bb0\u4e2d\u5207\u6362\u5e03\u5c14\u5c5e\u6027\u7684\u503c\uff0c\u8bf7\u5c06\u8be5\u503c\u9ed8\u8ba4\u4e3a \u3002\u8bf7\u53c2\u89c1\u5e03\u5c14\u5c5e\u6027\u3002<code>false<\/code><\/p>\n\n\n\n<p>\u63d0\u793a<\/p>\n\n\n\n<p>\u6b64\u793a\u4f8b\u4ee3\u7801\u662f&nbsp;github.com\/trailheadapps\/lwc-recipes&nbsp;\u5b58\u50a8\u5e93\u4e2d\u7684\u7ec4\u4ef6\u3002<code>helloConditionalRendering<\/code><\/p>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"render-lists\">\u6e32\u67d3\u5217\u8868<\/h1>\n\n\n\n<p>\u82e5\u8981\u5448\u73b0\u9879\u5217\u8868\uff0c\u8bf7\u4f7f\u7528 directive \u6216 the directive \u5faa\u73af\u8bbf\u95ee\u6570\u7ec4\u3002\u5c06\u8be5\u6307\u4ee4\u6dfb\u52a0\u5230\u5305\u542b\u8981\u91cd\u590d\u7684 HTML \u5143\u7d20\u7684\u5d4c\u5957\u6807\u8bb0\u4e2d\u3002<code>for:each<\/code><code>iterator<\/code><code>&lt;template&gt;<\/code><\/p>\n\n\n\n<p>\u8be5\u6307\u4ee4\u5177\u6709 \u548c \u5c5e\u6027\uff0c\u53ef\u7528\u4e8e\u5c06\u7279\u6b8a\u884c\u4e3a\u5e94\u7528\u4e8e\u6570\u7ec4\u4e2d\u7684\u7b2c\u4e00\u4e2a\u548c\u6700\u540e\u4e00\u4e2a\u9879\u76ee\u3002<code>iterator<\/code><code>first<\/code><code>last<\/code><\/p>\n\n\n\n<p>\u65e0\u8bba\u4f7f\u7528\u54ea\u4e2a\u6307\u4ee4\uff0c\u90fd\u5fc5\u987b\u4f7f\u7528\u6307\u4ee4\u4e3a\u6bcf\u4e2a\u9879\u76ee\u5206\u914d\u552f\u4e00\u7684 ID\u3002\u5f53\u5217\u8868\u66f4\u6539\u65f6\uff0c\u6846\u67b6\u4f7f\u7528 \u4ec5\u91cd\u65b0\u5448\u73b0\u5df2\u66f4\u6539\u7684\u9879\u3002\u6a21\u677f\u4e2d\u7684 \u7528\u4e8e\u6027\u80fd\u4f18\u5316\uff0c\u5728\u8fd0\u884c\u65f6\u4e0d\u4f1a\u53cd\u6620\u5728 DOM \u4e2d\u3002<code>key<\/code><code>key<\/code><code>key<\/code><\/p>\n\n\n\n<p>\u63d0\u793a<\/p>\n\n\n\n<p>\u82e5\u8981\u5728\u4ee3\u7801\u7f16\u8f91\u5668\u4e2d\u7ee7\u7eed\u64cd\u4f5c\uff0c\u8bf7\u6253\u5f00&nbsp;github.com\/trailheadapps\/lwc-recipes&nbsp;\u5b58\u50a8\u5e93\u4e2d\u7684 \u548c\u7ec4\u4ef6\u3002\u8fd8\u53ef\u4ee5\u5c06\u4ee3\u7801\u590d\u5236\u5230\u7ec4\u4ef6 IDE\u3002<code>helloForEachhelloIterator<\/code><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u9002\u5408\uff1a\u6bcf\u4e2a<\/h2>\n\n\n\n<p>\u4f7f\u7528\u8be5\u6307\u4ee4\u65f6\uff0cuse \u7528\u4e8e\u8bbf\u95ee\u5f53\u524d\u9879\u76ee\u3002\u6b64\u793a\u4f8b\u4e0d\u4f7f\u7528\u5b83\uff0c\u4f46\u8981\u8bbf\u95ee\u5f53\u524d\u9879\u7684\u7d22\u5f15\uff0c\u8bf7\u4f7f\u7528 .<code>for:each<\/code><code>for:item=\"currentItem\"<\/code><code>for:index=\"index\"<\/code><\/p>\n\n\n\n<p>\u82e5\u8981\u5c06\u952e\u5206\u914d\u7ed9\u5d4c\u5957\u6a21\u677f\u4e2d\u7684\u7b2c\u4e00\u4e2a\u5143\u7d20\uff0c\u8bf7\u4f7f\u7528\u8be5\u6307\u4ee4\u3002<code>key={uniqueId}<\/code><\/p>\n\n\n\n<p>\u6b64\u793a\u4f8b\u5faa\u73af\u8bbf\u95ee\u4e00\u4e2a\u540d\u4e3a \u7684\u6570\u7ec4\uff0c\u8be5\u6570\u7ec4\u5728\u7ec4\u4ef6\u7684 JavaScript \u7c7b\u4e2d\u5b9a\u4e49\u3002<code>contacts<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- helloForEach.html --&gt;\n&lt;template&gt;\n  &lt;lightning-card title=\"HelloForEach\" icon-name=\"custom:custom14\"&gt;\n    &lt;ul class=\"slds-m-around_medium\"&gt;\n      &lt;template for:each={contacts} for:item=\"contact\"&gt;\n        &lt;li key={contact.Id}&gt;{contact.Name}, {contact.Title}&lt;\/li&gt;\n      &lt;\/template&gt;\n    &lt;\/ul&gt;\n  &lt;\/lightning-card&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ helloForEach.js\nimport { LightningElement } from \"lwc\";\n\nexport default class HelloForEach extends LightningElement {\n  contacts = &#91;\n    {\n      Id: 1,\n      Name: \"Amy Taylor\",\n      Title: \"VP of Engineering\",\n    },\n    {\n      Id: 2,\n      Name: \"Michael Jones\",\n      Title: \"VP of Sales\",\n    },\n    {\n      Id: 3,\n      Name: \"Jennifer Wu\",\n      Title: \"CEO\",\n    },\n  ];\n}<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"446\" height=\"137\" src=\"http:\/\/www.ponybai.com\/wp-content\/uploads\/2023\/11\/list.png\" alt=\"\" class=\"wp-image-3802\" srcset=\"http:\/\/www.ponybai.com\/wp-content\/uploads\/2023\/11\/list.png 446w, http:\/\/www.ponybai.com\/wp-content\/uploads\/2023\/11\/list-300x92.png 300w\" sizes=\"(max-width: 446px) 100vw, 446px\" \/><\/figure>\n\n\n\n<p>\u91cd\u8981<\/p>\n\n\n\n<p>\u5217\u8868\u4e2d\u7684\u6bcf\u4e2a\u9879\u76ee\u90fd\u5fc5\u987b\u5177\u6709 .\u5f53\u5217\u8868\u66f4\u6539\u65f6\uff0c\u6846\u67b6\u4f7f\u7528 \u6765\u6807\u8bc6\u6bcf\u4e2a\u9879\u76ee\uff0c\u4ee5\u4fbf\u5b83\u53ea\u80fd\u91cd\u65b0\u5448\u73b0\u5df2\u66f4\u6539\u7684\u9879\u76ee\u3002\u5fc5\u987b\u662f\u5b57\u7b26\u4e32\u6216\u6570\u5b57\uff0c\u4e0d\u80fd\u662f\u5bf9\u8c61\u3002\u4e0d\u80fd\u7528\u4f5c \u7684\u503c\u3002\u4e3a\u4f20\u5165\u6570\u636e\u96c6\u5206\u914d\u552f\u4e00\u952e\u3002\u82e5\u8981\u5c06\u65b0\u9879\u6dfb\u52a0\u5230\u6570\u636e\u96c6\uff0c\u8bf7\u4f7f\u7528\u79c1\u6709\u5c5e\u6027\u6765\u8ddf\u8e2a\u548c\u751f\u6210\u952e\u3002<code>key<\/code><code>key<\/code><code>key<\/code><code>index<\/code><code>key<\/code><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u8fed \u4ee3<\/h2>\n\n\n\n<p>\u82e5\u8981\u5c06\u7279\u6b8a\u884c\u4e3a\u5e94\u7528\u4e8e\u5217\u8868\u4e2d\u7684\u7b2c\u4e00\u9879\u6216\u6700\u540e\u4e00\u9879\uff0c\u8bf7\u4f7f\u7528\u6307\u4ee4 \u3002\u5728\u6807\u8bb0\u4e0a\u4f7f\u7528\u6307\u4ee4\u3002<code>iterator<\/code><code>iterator:iteratorName={array}<\/code><code>iterator<\/code><code>template<\/code><\/p>\n\n\n\n<p>\u4f7f\u7528&nbsp;<em><code>iteratorName<\/code><\/em>&nbsp;\u8bbf\u95ee\u4ee5\u4e0b\u5c5e\u6027\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>value<\/code>&#8211; \u5217\u8868\u4e2d\u9879\u76ee\u7684\u503c\u3002\u4f7f\u7528\u6b64\u5c5e\u6027\u53ef\u8bbf\u95ee\u6570\u7ec4\u7684\u5c5e\u6027\u3002\u4f8b\u5982\u3002<code>{iteratorName}.value.{propertyName}<\/code><\/li>\n\n\n\n<li><code>index<\/code>&#8211; \u5217\u8868\u4e2d\u9879\u76ee\u7684\u7d22\u5f15\u3002<\/li>\n\n\n\n<li><code>first<\/code>&#8211; \u4e00\u4e2a\u5e03\u5c14\u503c\uff0c\u6307\u793a\u6b64\u9879\u76ee\u662f\u5426\u4e3a\u5217\u8868\u4e2d\u7684\u7b2c\u4e00\u9879\u3002<\/li>\n\n\n\n<li><code>last<\/code>&#8211; \u4e00\u4e2a\u5e03\u5c14\u503c\uff0c\u6307\u793a\u6b64\u9879\u76ee\u662f\u5426\u4e3a\u5217\u8868\u4e2d\u7684\u6700\u540e\u4e00\u9879\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u6b64\u793a\u4f8b\u4ee3\u7801\u4f7f\u7528\u4e0e\u4e0a\u4e00\u4e2a\u793a\u4f8b\u76f8\u540c\u7684\u6570\u7ec4\u3002\u82e5\u8981\u5c06\u7279\u6b8a\u5448\u73b0\u5e94\u7528\u4e8e\u5217\u8868\u4e2d\u7684\u7b2c\u4e00\u9879\u548c\u6700\u540e\u4e00\u9879\uff0c\u4ee3\u7801\u5c06 and \u5c5e\u6027\u4e0e\u6307\u4ee4\u4e00\u8d77\u4f7f\u7528\u3002<code>first<\/code><code>last<\/code><code>lwc:if<\/code><\/p>\n\n\n\n<p>\u5982\u679c\u9879\u76ee\u4f4d\u4e8e\u5217\u8868\u4e2d\u7684\u7b2c\u4e00\u4e2a\uff0c\u5219\u6807\u8bb0\u5c06\u4f7f\u7528 CSS \u7c7b\u4e2d\u5b9a\u4e49\u7684\u6837\u5f0f\u8fdb\u884c\u5448\u73b0\u3002\u5982\u679c\u9879\u76ee\u5728\u5217\u8868\u4e2d\u6392\u5728\u6700\u540e\uff0c\u5219\u6807\u8bb0\u5c06\u4f7f\u7528 CSS \u7c7b\u4e2d\u5b9a\u4e49\u7684\u6837\u5f0f\u8fdb\u884c\u5448\u73b0\u3002<code>&lt;div&gt;<\/code><code>list-first<\/code><code>&lt;div&gt;<\/code><code>list-last<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;template&gt;\n  &lt;lightning-card title=\"HelloIterator\" icon-name=\"custom:custom14\"&gt;\n    &lt;ul class=\"slds-m-around_medium\"&gt;\n      &lt;template iterator:it={contacts}&gt;\n        &lt;li key={it.value.Id}&gt;\n          &lt;div lwc:if={it.first} class=\"list-first\"&gt;&lt;\/div&gt;\n          {it.value.Name}, {it.value.Title}\n          &lt;div lwc:if={it.last} class=\"list-last\"&gt;&lt;\/div&gt;\n        &lt;\/li&gt;\n      &lt;\/template&gt;\n    &lt;\/ul&gt;\n  &lt;\/lightning-card&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>.list-first {\n  border-top: 1px solid black;\n  padding-top: 5px;\n}\n\n.list-last {\n  border-bottom: 1px solid black;\n  padding-bottom: 5px;\n}<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full is-style-default\"><img loading=\"lazy\" decoding=\"async\" width=\"443\" height=\"146\" src=\"http:\/\/www.ponybai.com\/wp-content\/uploads\/2023\/11\/list_iterator.png\" alt=\"\" class=\"wp-image-3804\" srcset=\"http:\/\/www.ponybai.com\/wp-content\/uploads\/2023\/11\/list_iterator.png 443w, http:\/\/www.ponybai.com\/wp-content\/uploads\/2023\/11\/list_iterator-300x99.png 300w\" sizes=\"(max-width: 443px) 100vw, 443px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f8b<\/h2>\n\n\n\n<p>lwc-recipes&nbsp;\u5b58\u50a8\u5e93\u4e2d\u7684\u7ec4\u4ef6\u4f7f\u7528\u57fa\u672c\u7ec4\u4ef6\u6765\u663e\u793a\u9009\u62e9\u5217\u8868\u503c\u5217\u8868\u3002<code>wireGetPicklistValues lightning-input<\/code><\/p>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"render-multiple-templates\">\u6e32\u67d3\u591a\u4e2a\u6a21\u677f<\/h1>\n\n\n\n<p>\u60a8\u53ef\u80fd\u5e0c\u671b\u5448\u73b0\u5177\u6709\u591a\u79cd\u5916\u89c2\u7684\u7ec4\u4ef6\uff0c\u4f46\u4e0d\u5e0c\u671b\u5c06 HTML \u6df7\u5408\u5728\u4e00\u4e2a\u6587\u4ef6\u4e2d\u3002\u4f8b\u5982\uff0c\u7ec4\u4ef6\u7684\u4e00\u4e2a\u7248\u672c\u662f\u7eaf\u6587\u672c\uff0c\u53e6\u4e00\u4e2a\u7248\u672c\u663e\u793a\u56fe\u50cf\u548c\u989d\u5916\u7684\u6587\u672c\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u60a8\u53ef\u4ee5\u5bfc\u5165\u591a\u4e2a HTML \u6a21\u677f\u5e76\u7f16\u5199\u6709\u6761\u4ef6\u5730\u5448\u73b0\u8fd9\u4e9b\u6a21\u677f\u7684\u4e1a\u52a1\u903b\u8f91\u3002\u6b64\u6a21\u5f0f\u7c7b\u4f3c\u4e8e\u67d0\u4e9b JavaScript \u6846\u67b6\u4e2d\u4f7f\u7528\u7684\u4ee3\u7801\u62c6\u5206\u3002<\/p>\n\n\n\n<p>\u6ce8\u610f<\/p>\n\n\n\n<p>\u5c3d\u7ba1\u4e00\u4e2a\u7ec4\u4ef6\u53ef\u4ee5\u5448\u73b0\u591a\u4e2a\u6a21\u677f\uff0c\u4f46\u6211\u4eec\u5efa\u8bae\u6539\u7528\u6307\u4ee4\u6709\u6761\u4ef6\u5730\u5448\u73b0\u5d4c\u5957\u6a21\u677f\u3002<code>lwc:if|elseif|else<\/code><\/p>\n\n\n\n<p>\u5728\u7ec4\u4ef6\u5305\u4e2d\u521b\u5efa\u591a\u4e2a HTML \u6587\u4ef6\u3002\u5c06\u5b83\u4eec\u5168\u90e8\u5bfc\u5165\uff0c\u5e76\u5728\u65b9\u6cd5\u4e2d\u6dfb\u52a0\u6761\u4ef6\uff0c\u4ee5\u6839\u636e\u7ec4\u4ef6\u7684\u72b6\u6001\u8fd4\u56de\u6b63\u786e\u7684\u6a21\u677f\u3002\u8be5\u65b9\u6cd5\u8fd4\u56de\u7684\u503c\u5fc5\u987b\u662f\u6a21\u677f\u5f15\u7528\uff0c\u8fd9\u662f\u4ece HTML \u6587\u4ef6\u5bfc\u5165\u7684\u9ed8\u8ba4\u5bfc\u51fa\u3002<code>render()<\/code><code>render()<\/code><\/p>\n\n\n\n<p>\u5728\u6b64\u793a\u4f8b\u4e2d\uff0c\u6a21\u677f\u5f15\u7528\u662f \u548c \u3002<code>templateOne<\/code><code>templateTwo<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ miscMultipleTemplates.js\n\nimport { LightningElement } from \"lwc\";\nimport templateOne from \".\/templateOne.html\";\nimport templateTwo from \".\/templateTwo.html\";\n\nexport default class MiscMultipleTemplates extends LightningElement {\n  showTemplateOne = true;\n\n  render() {\n    return this.showTemplateOne ? templateOne : templateTwo;\n  }\n\n  switchTemplate() {\n    this.showTemplateOne = !this.showTemplateOne;\n  }\n}<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- templateOne.html --&gt;\n&lt;template&gt;\n  &lt;lightning-card title=\"Template One\"&gt;\n    &lt;div&gt;This is template one.&lt;\/div&gt;\n    &lt;p class=\"margin-vertical-small\"&gt;\n      &lt;lightning-button label=\"Switch Templates\" onclick={switchTemplate}&gt; &lt;\/lightning-button&gt;\n    &lt;\/p&gt;\n  &lt;\/lightning-card&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- templateTwo.html --&gt;\n&lt;template&gt;\n  &lt;lightning-card title=\"Template Two\"&gt;\n    &lt;div&gt;This is template two.&lt;\/div&gt;\n    &lt;p class=\"margin-vertical-small\"&gt;\n      &lt;lightning-button label=\"Switch Templates\" onclick={switchTemplate}&gt; &lt;\/lightning-button&gt;\n    &lt;\/p&gt;\n  &lt;\/lightning-card&gt;\n&lt;\/template&gt;<\/code><\/pre>\n\n\n\n<p>\u82e5\u8981\u4ece\u989d\u5916\u6a21\u677f\u5f15\u7528 CSS\uff0cCSS \u6587\u4ef6\u540d\u5fc5\u987b\u4e0e\u989d\u5916\u6a21\u677f\u7684\u6587\u4ef6\u540d\u5339\u914d\u3002\u4f8b\u5982\uff0c\u53ea\u80fd\u4ece \u5f15\u7528 CSS\u3002\u5b83\u4e0d\u80fd\u4ece \u6216 \u5f15\u7528 CSS\u3002<code>templateTwo.html<\/code><code>templateTwo.css<\/code><code>miscMultipleTemplates.css<\/code><code>templateOne.css<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>MiscMultipleTemplates\n   \u251c\u2500\u2500miscMultipleTemplates.js\n   \u251c\u2500\u2500miscMultipleTemplates.js-meta.xml\n   \u251c\u2500\u2500templateOne.html\n   \u251c\u2500\u2500templateOne.css\n   \u251c\u2500\u2500templateTwo.html\n   \u2514\u2500\u2500templateTwo.css<\/code><\/pre>\n\n\n\n<p>\u5982\u679c\u5305\u542b\u5177\u6709\u5339\u914d\u540d\u79f0\u7684\u6a21\u677f\uff0c\u5219\u9ed8\u8ba4\u65b9\u6cd5\u5c06\u8fd4\u56de\u8be5\u6a21\u677f\uff0c\u9664\u975e\u5305\u542b\u4e0a\u4e00\u793a\u4f8b\u4e2d\u8ba8\u8bba\u7684\u66ff\u4ee3\u3002<code>miscMultipleTemplates.html<\/code><code>render()<\/code><\/p>\n\n\n\n<p>\u63d0\u793a<\/p>\n\n\n\n<p>\u67e5\u770b&nbsp;lwc-recipes \u5b58\u50a8\u5e93\u4e2d\u7684\u7ec4\u4ef6\u3002<code>miscMultipleTemplates<\/code><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Lightning Web \u7ec4\u4ef6\u662f\u5177\u6709\u81ea\u5df1\u7684 API \u7684\u53ef\u91cd\u7528\u81ea\u5b9a\u4e49 HTML \u5143\u7d20\u3002<\/p>\n<p>\u8bf7\u67e5\u770b\u8fd9\u4e9b\u90e8\u5206\uff0c\u4e86\u89e3\u6709\u5173\u521b\u5efa\u81ea\u5df1\u7684 Lightning Web \u7ec4\u4ef6\u7684\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[235],"class_list":["post-3797","post","type-post","status-publish","format-standard","hentry","category-lightning-web-","tag--lightning-web-"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u521b\u5efa Lightning Web \u7ec4\u4ef6 - \u767d\u767d\u968f\u7b14<\/title>\n<meta name=\"description\" content=\"Lightning Web \u7ec4\u4ef6\u662f\u5177\u6709\u81ea\u5df1\u7684 API \u7684\u53ef\u91cd\u7528\u81ea\u5b9a\u4e49 HTML \u5143\u7d20\u3002\u8bf7\u67e5\u770b\u8fd9\u4e9b\u90e8\u5206\uff0c\u4e86\u89e3\u6709\u5173\u521b\u5efa\u81ea\u5df1\u7684 Lightning Web \u7ec4\u4ef6\u7684\u66f4\u591a\u4fe1\u606f\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=3797\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u521b\u5efa Lightning Web \u7ec4\u4ef6 - \u767d\u767d\u968f\u7b14\" \/>\n<meta property=\"og:description\" content=\"Lightning Web \u7ec4\u4ef6\u662f\u5177\u6709\u81ea\u5df1\u7684 API \u7684\u53ef\u91cd\u7528\u81ea\u5b9a\u4e49 HTML \u5143\u7d20\u3002\u8bf7\u67e5\u770b\u8fd9\u4e9b\u90e8\u5206\uff0c\u4e86\u89e3\u6709\u5173\u521b\u5efa\u81ea\u5df1\u7684 Lightning Web \u7ec4\u4ef6\u7684\u66f4\u591a\u4fe1\u606f\u3002\" \/>\n<meta property=\"og:url\" content=\"http:\/\/www.ponybai.com\/?p=3797\" \/>\n<meta property=\"og:site_name\" content=\"\u767d\u767d\u968f\u7b14\" \/>\n<meta property=\"article:published_time\" content=\"2024-01-03T13:44:18+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-11-29T13:57:04+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/www.ponybai.com\/wp-content\/uploads\/2023\/11\/render_conditional.png\" \/>\n<meta name=\"author\" content=\"ponybai\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"ponybai\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 \u5206\" \/>\n<script type=\"application\/ld+json\" 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