{"id":3217,"date":"2021-01-12T22:49:02","date_gmt":"2021-01-12T14:49:02","guid":{"rendered":"http:\/\/www.salesforcecrm.cn\/?p=3217"},"modified":"2021-01-12T22:49:02","modified_gmt":"2021-01-12T14:49:02","slug":"%e7%94%b5web%e7%bb%84%e4%bb%b6%e5%9f%ba%e7%a1%80-%e5%88%9b%e5%bb%ba%e9%97%aa%e7%94%b5web%e7%bb%84%e4%bb%b6","status":"publish","type":"post","link":"http:\/\/www.ponybai.com\/?p=3217","title":{"rendered":"\u7535Web\u7ec4\u4ef6\u57fa\u7840 &#8211; \u521b\u5efa\u95ea\u7535Web\u7ec4\u4ef6"},"content":{"rendered":"<h2 id=\"learning-objectives\">\u5b66\u4e60\u76ee\u6807<\/h2>\n<p>\u5b8c\u6210\u672c\u5355\u5143\u540e\uff0c\u60a8\u5c06\u80fd\u591f\uff1a<\/p>\n<ul>\n<li>\u63cf\u8ff0\u6bcf\u4e2a\u7ec4\u4ef6\u6587\u4ef6\u7684\u5185\u5bb9\u3002<\/li>\n<li>\u4e3aLightning Web\u7ec4\u4ef6\u521b\u5efaJavaScript\u65b9\u6cd5\u3002<\/li>\n<li>\u5728\u7ec4\u4ef6JavaScript\u4e2d\u4f7f\u7528\u751f\u547d\u5468\u671f\u6302\u94a9\u3002<\/li>\n<\/ul>\n<h2 id=\"some-serious-play-time\">\u4e00\u4e9b\u4e25\u8083\u7684\u6e38\u620f\u65f6\u95f4<\/h2>\n<p>\u5047\u8bbe\u60a8\u8981\u72ec\u7acb\u4e8eSalesforce\u4e2d\u7684\u7279\u5b9a\u5bf9\u8c61\u6784\u5efa\u6570\u636e\u663e\u793a\u5143\u7d20\u3002\u4e00\u4e2a\u5f88\u597d\u7684\u4f8b\u5b50\u662febikes\u793a\u4f8b\u5b58\u50a8\u5e93\u4e2d\u7684\u00a0productCard\u7ec4\u4ef6\u3002\u8ba9\u6211\u4eec\u68c0\u67e5\u4e00\u4e0b\u8be5\u5361\u7ec4\u4ef6\uff0c\u5e76\u4ece\u5934\u5f00\u59cb\u6784\u5efa\u6211\u4eec\u81ea\u5df1\u7684\u7248\u672c\uff0c\u4ee5\u4fbf\u60a8\u53ef\u4ee5\u770b\u5230\u5b83\u5982\u4f55\u6f14\u53d8\u4e3a\u6210\u719f\u7684Lightning Web\u7ec4\u4ef6\u3002\u5728Lightning Web Components Playground\u4e2d\u6784\u5efa\u7ec4\u4ef6\u7684\u5404\u4e2a\u90e8\u5206\u5e76\u63a2\u7d22\u66f4\u591a\u793a\u4f8b\u65f6\uff0c\u60a8\u5c06\u5feb\u901f\u83b7\u5f97\u57fa\u7840\u77e5\u8bc6\u3002<\/p>\n<p>\u7ec4\u4ef6\u53ea\u9700\u8981\u4e00\u4e2a\u6587\u4ef6\u5939\u53ca\u5176\u540d\u79f0\u76f8\u540c\u7684\u6587\u4ef6\u3002\u5b83\u4eec\u4f1a\u6309\u540d\u79f0\u548c\u4f4d\u7f6e\u81ea\u52a8\u94fe\u63a5\u3002<\/p>\n<p><span class=\"image image-block\"><img decoding=\"async\" class=\"image image-block\" src=\"https:\/\/res.cloudinary.com\/hy4kyit2a\/f_auto,fl_lossy,q_70\/learn\/modules\/lightning-web-components-basics\/create-lightning-web-components\/images\/9e4fcadf6be0b471030366f2e6f0022c_app-files.png\" alt=\"\u6587\u4ef6\u5939\u4e2d\u7684\u7ec4\u4ef6\u6587\u4ef6\" \/><\/span><\/p>\n<p>\u6240\u6709Lightning Web\u7ec4\u4ef6\u90fd\u6709\u4e00\u4e2a\u540d\u79f0\u7a7a\u95f4\uff0c\u8be5\u540d\u79f0\u7a7a\u95f4\u4e0e\u6587\u4ef6\u5939\u540d\u79f0\u4e4b\u95f4\u7528\u8fde\u5b57\u7b26\u5206\u9694\u3002\u4f8b\u5982\uff0c\u9ed8\u8ba4\u540d\u79f0\u7a7a\u95f4c\u4e2d\u6587\u4ef6\u5939\u540d\u79f0\u4e3aapp\u7684Lightning Web\u7ec4\u4ef6\u7684\u6807\u8bb0\u4e3a<code>&lt;c-app&gt;<\/code>\u3002\u60a8\u53ef\u4ee5<code>main.js<\/code>\u5728Lightning Web Components Playground\u4e2d\u770b\u5230\u8fd9\u4e00\u70b9\u3002<\/p>\n<p>\u4f46\u662f\uff0cSalesforce\u5e73\u53f0\u4e0d\u5141\u8bb8\u5728\u7ec4\u4ef6\u6587\u4ef6\u5939\u6216\u6587\u4ef6\u540d\u4e2d\u4f7f\u7528\u8fde\u5b57\u7b26\u3002\u5982\u679c\u7ec4\u4ef6\u7684\u540d\u79f0\u5305\u542b\u591a\u4e2a\u5355\u8bcd\uff08\u4f8b\u5982\u201c mycomponent\u201d\uff09\u600e\u4e48\u529e\uff1f\u60a8\u65e0\u6cd5\u547d\u540d\u6587\u4ef6\u5939\u548c\u6587\u4ef6my-component\uff0c\u4f46\u662f\u6211\u4eec\u6709\u4e00\u4e2a\u4fbf\u6377\u7684\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n<p>\u4f7f\u7528\u9a7c\u5cf0\u5f0f\u5916\u58f3\u547d\u540d\u60a8\u7684\u7ec4\u4ef6<code>myComponent<\/code>\u3002\u9a7c\u5cf0\u6848\u4f8b\u7ec4\u4ef6\u6587\u4ef6\u5939\u540d\u79f0\u5728\u6807\u8bb0\u4e2d\u6620\u5c04\u5230kebab-case\u3002\u5728\u6807\u8bb0\u4e2d\uff0c\u8981\u5f15\u7528\u6587\u4ef6\u5939\u540d\u4e3amyComponent\u7684\u7ec4\u4ef6\uff0c\u8bf7\u4f7f\u7528<code>&lt;c-my-component&gt;<\/code>\u3002<\/p>\n<p>\u4f8b\u5982\uff0cLWC Samples\u5b58\u50a8\u5e93\u7684\u00a0viewSource\u6587\u4ef6\u5939\u5305\u542bviewSource\u7ec4\u4ef6\u7684\u6587\u4ef6\u3002\u5f53hello\u7ec4\u4ef6\u00a0\u5f15\u7528HTML\u4e2d\u7684viewSource\u7ec4\u4ef6\u65f6\uff0c\u5c06\u4f7f\u7528\u00a0<code>c-view-source<\/code>\u3002<\/p>\n<h2 id=\"a-look-into-the-html-file\">\u6d4f\u89c8HTML\u6587\u4ef6<\/h2>\n<p>Lightning Web\u7ec4\u4ef6HTML\u6587\u4ef6\u5747\u5305\u542b\u00a0<code>template<\/code>\u6807\u8bb0\u3002\u8be5\u00a0<code>template<\/code>\u6807\u7b7e\u5305\u542b\u5b9a\u4e49\u60a8\u7684\u7ec4\u4ef6\u7ed3\u6784\u7684HTML\u3002\u8ba9\u6211\u4eec\u770b\u4e00\u4e0bebikes\u56de\u8d2d\u4e2dproductCard\u7ec4\u4ef6\u7684\u7b80\u5316\u7248\u672c\u7684HTML\u3002<\/p>\n<p>\u63a5\u4e0b\u6765\uff0c\u5c06\u8fd9\u4e9b\u793a\u4f8b\u7c98\u8d34\u5230\u00a0Lightning Web Components Playground\u4e2d\u3002<\/p>\n<ol>\n<li>\u5355\u51fb<strong>\u65b0\u5efa<\/strong>\u5f00\u59cb\u4e00\u4e2a\u65b0\u9879\u76ee\u3002<\/li>\n<li>\u5c06\u4ee5\u4e0b\u5185\u5bb9\u7c98\u8d34\u5230app.html\u4e2d\uff08\u66ff\u6362\u6587\u4ef6\u4e2d\u6240\u6709\u73b0\u6709\u7684HTML\uff09\u3002<\/li>\n<\/ol>\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\"><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>template<span class=\"token punctuation\">&gt;<\/span><\/span>\n    <span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>div<span class=\"token punctuation\">&gt;<\/span><\/span>\n        <span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>div<span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token class-name\">Name<\/span><span class=\"token operator\">:<\/span> <span class=\"token punctuation\">{<\/span>name<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>div<span class=\"token operator\">&gt;<\/span>\n        <span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>div<span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token class-name\">Description<\/span><span class=\"token operator\">:<\/span> <span class=\"token punctuation\">{<\/span>description<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>div<span class=\"token operator\">&gt;<\/span>\n        <span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>div<span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token class-name\">Category<\/span><span class=\"token operator\">:<\/span> <span class=\"token punctuation\">{<\/span>category<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>div<span class=\"token operator\">&gt;<\/span>\n        <span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>div<span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token class-name\">Material<\/span><span class=\"token operator\">:<\/span> <span class=\"token punctuation\">{<\/span>material<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>div<span class=\"token operator\">&gt;<\/span>\n        <span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>div<span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token class-name\">Price<\/span><span class=\"token operator\">:<\/span> <span class=\"token punctuation\">{<\/span>price<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>div<span class=\"token operator\">&gt;<\/span>\n        <span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>div<span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token operator\">&lt;<\/span>img src<span class=\"token operator\">=<\/span><span class=\"token punctuation\">{<\/span>pictureUrl<span class=\"token punctuation\">}<\/span><span class=\"token operator\">\/<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>div<span class=\"token operator\">&gt;<\/span>\n    <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>div<span class=\"token operator\">&gt;<\/span>\n<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>template<span class=\"token operator\">&gt;<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\"><\/div>\n<\/div>\n<\/div>\n<p>\u82b1\u62ec\u53f7{}\u4e2d\u7684\u6807\u8bc6\u7b26\u7ed1\u5b9a\u5230\u76f8\u5e94JavaScript\u7c7b\u4e2d\u540c\u540d\u7684\u5b57\u6bb5\u3002<\/p>\n<p>\u8fd9\u662f\u4e00\u4e2a\u652f\u6301\u6b64HTML\u7684JavaScript\u6587\u4ef6\u3002\u5c06\u6b64\u7c98\u8d34\u5230<code>app.js<\/code>\u3002<\/p>\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\"><span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token class-name\">LightningElement<\/span> <span class=\"token punctuation\">}<\/span> from <span class=\"token string\">'lwc'<\/span><span class=\"token punctuation\">;<\/span>\nexport <span class=\"token keyword\">default<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">App<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">LightningElement<\/span> <span class=\"token punctuation\">{<\/span>\n   name <span class=\"token operator\">=<\/span> <span class=\"token string\">'Electra X4'<\/span><span class=\"token punctuation\">;<\/span>\n   description <span class=\"token operator\">=<\/span> <span class=\"token string\">'A sweet bike built for comfort.'<\/span><span class=\"token punctuation\">;<\/span>\n   category <span class=\"token operator\">=<\/span> <span class=\"token string\">'Mountain'<\/span><span class=\"token punctuation\">;<\/span>\n   material <span class=\"token operator\">=<\/span> <span class=\"token string\">'Steel'<\/span><span class=\"token punctuation\">;<\/span>\n   price <span class=\"token operator\">=<\/span> <span class=\"token string\">'$2,700'<\/span><span class=\"token punctuation\">;<\/span>\n   pictureUrl <span class=\"token operator\">=<\/span> <span class=\"token string\">'https:\/\/s3-us-west-1.amazonaws.com\/sfdc-demo\/ebikes\/electrax4.jpg'<\/span><span class=\"token punctuation\">;<\/span>\n<span class=\"token punctuation\">}<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\"><\/div>\n<\/div>\n<\/div>\n<p>\u9884\u89c8\u73b0\u5728\u663e\u793a\u5e26\u6709\u4e00\u4e9b\u7ec6\u8282\u7684\u81ea\u884c\u8f66\u3002\u5982\u679c\u6ca1\u6709\uff0c\u8bf7\u70b9\u51fb<strong class=\"ph\">\u8fd0\u884c<\/strong>\u3002<\/p>\n<p>\u73b0\u5728\uff0c\u5047\u8bbe\u60a8\u8981\u663e\u793a\u6570\u636e\uff0c\u4f46\u662f\u60a8\u77e5\u9053\u5b83\u53ef\u80fd\u9700\u8981\u4e00\u4e9b\u65f6\u95f4\u624d\u80fd\u52a0\u8f7d\u3002\u60a8\u4e0d\u5e0c\u671b\u7528\u6237\u60f3\u77e5\u9053\u600e\u4e48\u56de\u4e8b\u3002\u60a8\u53ef\u4ee5\u5728\u6a21\u677f\u4e2d\u4f7f\u7528\u00a0<code>if:false<\/code>\u548c\u00a0<code>if:true<\/code>\u6761\u4ef6\u6307\u4ee4\u6765\u786e\u5b9a\u5448\u73b0\u54ea\u4e9b\u89c6\u89c9\u5143\u7d20\u3002<\/p>\n<p>\u5728\u201c\u663e\u793a\u201d\u4ee5\u4e0b\u5185\u5bb9\u00a0<code>div<\/code>\u6807\u7b7e\u6ca1\u6709\u51fa\u73b0\uff0c\u76f4\u5230\u503c\u00a0<code>ready<\/code>\u662f\u00a0<code>true<\/code>\u5728HTML\u6587\u4ef6\u4e2d\u3002<\/p>\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\"><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>template<span class=\"token punctuation\">&gt;<\/span><\/span>\n    <span class=\"token operator\">&lt;<\/span>div id<span class=\"token operator\">=<\/span><span class=\"token string\">\"waiting\"<\/span> <span class=\"token keyword\">if<\/span><span class=\"token operator\">:<\/span><span class=\"token boolean\">false<\/span><span class=\"token operator\">=<\/span><span class=\"token punctuation\">{<\/span>ready<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token class-name\">Loading<\/span>\u2026<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>div<span class=\"token operator\">&gt;<\/span>\n    <span class=\"token operator\">&lt;<\/span>div id<span class=\"token operator\">=<\/span><span class=\"token string\">\"display\"<\/span> <span class=\"token keyword\">if<\/span><span class=\"token operator\">:<\/span><span class=\"token boolean\">true<\/span><span class=\"token operator\">=<\/span><span class=\"token punctuation\">{<\/span>ready<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&gt;<\/span>\n        <span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>div<span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token class-name\">Name<\/span><span class=\"token operator\">:<\/span> <span class=\"token punctuation\">{<\/span>name<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>div<span class=\"token operator\">&gt;<\/span>\n        <span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>div<span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token class-name\">Description<\/span><span class=\"token operator\">:<\/span> <span class=\"token punctuation\">{<\/span>description<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>div<span class=\"token operator\">&gt;<\/span>\n        <span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>div<span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token class-name\">Category<\/span><span class=\"token operator\">:<\/span> <span class=\"token punctuation\">{<\/span>category<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>div<span class=\"token operator\">&gt;<\/span>\n        <span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>div<span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token class-name\">Material<\/span><span class=\"token operator\">:<\/span> <span class=\"token punctuation\">{<\/span>material<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>div<span class=\"token operator\">&gt;<\/span>\n        <span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>div<span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token class-name\">Price<\/span><span class=\"token operator\">:<\/span> <span class=\"token punctuation\">{<\/span>price<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>div<span class=\"token operator\">&gt;<\/span>\n        <span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>div<span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token operator\">&lt;<\/span>img src<span class=\"token operator\">=<\/span><span class=\"token punctuation\">{<\/span>pictureUrl<span class=\"token punctuation\">}<\/span><span class=\"token operator\">\/<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>div<span class=\"token operator\">&gt;<\/span>\n    <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>div<span class=\"token operator\">&gt;<\/span>\n<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>template<span class=\"token operator\">&gt;<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\"><\/div>\n<\/div>\n<\/div>\n<p>\u8fd9\u662f\u4e00\u4e9bJavaScript\u5728\u64cd\u573a\u4e0a\u8fdb\u884c\u6d4b\u8bd5\u3002\u8fd9\u5c06\u4fdd\u7559\u6211\u4eec\u7684\u6570\u636e\u503c\u5e76\u8bbe\u7f6e3\u79d2\u8ba1\u65f6\u5668\u30023\u79d2\u540e\uff0c\u5185\u5bb9\u5e94\u51fa\u73b0\u3002\uff08\u5f53\u7136\uff0c\u8fd9\u4ec5\u7528\u4e8e\u6d4b\u8bd5\u76ee\u7684\u3002\uff09<\/p>\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\"><span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token class-name\">LightningElement<\/span> <span class=\"token punctuation\">}<\/span> from <span class=\"token string\">'lwc'<\/span><span class=\"token punctuation\">;<\/span>\nexport <span class=\"token keyword\">default<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">App<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">LightningElement<\/span> <span class=\"token punctuation\">{<\/span>\n   name <span class=\"token operator\">=<\/span> <span class=\"token string\">'Electra X4'<\/span><span class=\"token punctuation\">;<\/span>\n   description <span class=\"token operator\">=<\/span> <span class=\"token string\">'A sweet bike built for comfort.'<\/span><span class=\"token punctuation\">;<\/span>\n   category <span class=\"token operator\">=<\/span> <span class=\"token string\">'Mountain'<\/span><span class=\"token punctuation\">;<\/span>\n   material <span class=\"token operator\">=<\/span> <span class=\"token string\">'Steel'<\/span><span class=\"token punctuation\">;<\/span>\n   price <span class=\"token operator\">=<\/span> <span class=\"token string\">'$2,700'<\/span><span class=\"token punctuation\">;<\/span>\n   pictureUrl <span class=\"token operator\">=<\/span> <span class=\"token string\">'https:\/\/s3-us-west-1.amazonaws.com\/sfdc-demo\/ebikes\/electrax4.jpg'<\/span><span class=\"token punctuation\">;<\/span>\n   ready <span class=\"token operator\">=<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span>\n   <span class=\"token function\">connectedCallback<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\n       <span class=\"token function\">setTimeout<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">=<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token punctuation\">{<\/span>\n           <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>ready <span class=\"token operator\">=<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span>\n       <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n   <span class=\"token punctuation\">}<\/span>\n<span class=\"token punctuation\">}<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\"><\/div>\n<\/div>\n<\/div>\n<p>\u5355\u51fb<strong class=\"ph\">\u8fd0\u884c<\/strong>\u4ee5\u67e5\u770b\u6761\u4ef6\u6307\u4ee4\u7684\u8fd0\u884c\u3002<\/p>\n<h2 id=\"base-lightning-web-components\">\u57fa\u7840\u95ea\u7535Web\u7ec4\u4ef6<\/h2>\n<p>\u73b0\u5728\uff0c\u60a8\u4e0d\u60f3\u4ece\u5934\u5f00\u59cb\u6784\u5efa\u6240\u6709\u7ec4\u4ef6\u3002\u56e0\u6b64\uff0c\u8ba9\u6211\u4eec\u63a2\u7d22\u4f7f\u7528\u57fa\u672c\u7684Lightning Web\u7ec4\u4ef6\u3002\u5f53\u7136\uff0c\u8fd8\u6709\u5f88\u591a\u7ec4\u4ef6\uff0c\u5305\u62ec\u5b57\u6bb5\u7c7b\u578b\uff0c\u663e\u793a\u63a7\u5236\u5668\uff0c\u5bfc\u822a\u9879\u7b49\u7b49\u3002\u6240\u6709\u8fd9\u4e9b\u90fd\u5728\u201c\u7ec4\u4ef6\u53c2\u8003\u201d\u4e2d\u5217\u51fa\u00a0\u3002<\/p>\n<p>\u8ba9\u6211\u4eec\u7a81\u51fa\u81ea\u884c\u8f66\u7684\u7ec6\u8282\u3002\u4e3a\u6b64\uff0c\u5c06\u4e0a\u4e00\u4e2a\u793a\u4f8b\u4e2d\u7684\u6750\u8d28\u548c\u7c7b\u522b\u7684div\u6807\u7b7e\u66ff\u6362\u4e3alightning-badge\u7ec4\u4ef6\u3002\u8fd9\u662fHTML\u3002<\/p>\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\"><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>template<span class=\"token punctuation\">&gt;<\/span><\/span>\n    <span class=\"token operator\">&lt;<\/span>div id<span class=\"token operator\">=<\/span><span class=\"token string\">\"waiting\"<\/span> <span class=\"token keyword\">if<\/span><span class=\"token operator\">:<\/span><span class=\"token boolean\">false<\/span><span class=\"token operator\">=<\/span><span class=\"token punctuation\">{<\/span>ready<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token class-name\">Loading<\/span>\u2026<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>div<span class=\"token operator\">&gt;<\/span>\n    <span class=\"token operator\">&lt;<\/span>div id<span class=\"token operator\">=<\/span><span class=\"token string\">\"display\"<\/span> <span class=\"token keyword\">if<\/span><span class=\"token operator\">:<\/span><span class=\"token boolean\">true<\/span><span class=\"token operator\">=<\/span><span class=\"token punctuation\">{<\/span>ready<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&gt;<\/span>\n        <span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>div<span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token class-name\">Name<\/span><span class=\"token operator\">:<\/span> <span class=\"token punctuation\">{<\/span>name<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>div<span class=\"token operator\">&gt;<\/span>\n        <span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>div<span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token class-name\">Description<\/span><span class=\"token operator\">:<\/span> <span class=\"token punctuation\">{<\/span>description<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>div<span class=\"token operator\">&gt;<\/span>\n        <span class=\"token operator\">&lt;<\/span>lightning<span class=\"token operator\">-<\/span>badge label<span class=\"token operator\">=<\/span><span class=\"token punctuation\">{<\/span>material<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>lightning<span class=\"token operator\">-<\/span>badge<span class=\"token operator\">&gt;<\/span>\n        <span class=\"token operator\">&lt;<\/span>lightning<span class=\"token operator\">-<\/span>badge label<span class=\"token operator\">=<\/span><span class=\"token punctuation\">{<\/span>category<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>lightning<span class=\"token operator\">-<\/span>badge<span class=\"token operator\">&gt;<\/span>\n        <span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>div<span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token class-name\">Price<\/span><span class=\"token operator\">:<\/span> <span class=\"token punctuation\">{<\/span>price<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>div<span class=\"token operator\">&gt;<\/span>\n        <span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>div<span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token operator\">&lt;<\/span>img src<span class=\"token operator\">=<\/span><span class=\"token punctuation\">{<\/span>pictureUrl<span class=\"token punctuation\">}<\/span><span class=\"token operator\">\/<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>div<span class=\"token operator\">&gt;<\/span>\n    <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>div<span class=\"token operator\">&gt;<\/span>\n<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>template<span class=\"token operator\">&gt;<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\"><\/div>\n<\/div>\n<\/div>\n<p><strong class=\"ph\">\u94a2\u94c1<\/strong>\u548c<strong class=\"ph\">\u5c71\u5cf0<\/strong>\u8fd9\u4e24\u4e2a\u5b57\u4f5c\u4e3a\u5fbd\u7ae0\u51fa\u73b0\u3002\u5c31\u8fd9\u4e48\u7b80\u5355\u3002<\/p>\n<p><span class=\"image image-block\"><img decoding=\"async\" class=\"image image-block\" src=\"https:\/\/res.cloudinary.com\/hy4kyit2a\/f_auto,fl_lossy,q_70\/learn\/modules\/lightning-web-components-basics\/create-lightning-web-components\/images\/323c229cd753741342a9476911e65f19_standard-component-ex.png\" alt=\"\u6b63\u5728\u4f7f\u7528\u95ea\u7535\u5fbd\u7ae0\" \/><\/span><\/p>\n<p>\u597d\u3002\u8ba9\u6211\u4eec\u770b\u4e00\u4e0bJavaScript\u3002<\/p>\n<h2 id=\"working-with-java-script\">\u4f7f\u7528JavaScript<\/h2>\n<p>\u8fd9\u662f\u4f7f\u4e8b\u60c5\u53d1\u751f\u7684\u5730\u65b9\u3002\u5230\u76ee\u524d\u4e3a\u6b62\uff0c\u60a8\u5df2\u7ecf\u770b\u5230\uff0cJavaScript\u65b9\u6cd5\u5b9a\u4e49\u4e86\u5982\u4f55\u5904\u7406\u8f93\u5165\uff0c\u6570\u636e\uff0c\u4e8b\u4ef6\uff0c\u72b6\u6001\u66f4\u6539\u7b49\uff0c\u4ee5\u4f7f\u7ec4\u4ef6\u6b63\u5e38\u5de5\u4f5c\u3002<\/p>\n<p>Lightning Web\u7ec4\u4ef6\u7684JavaScript\u6587\u4ef6\u5fc5\u987b\u81f3\u5c11\u5305\u542b\u6b64\u4ee3\u7801\uff0c\u5176\u4e2d\u00a0<code>MyComponent<\/code>\u662f\u60a8\u5206\u914d\u7684\u7ec4\u4ef6\u7c7b\u7684\u540d\u79f0\u3002<\/p>\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\"><span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token class-name\">LightningElement<\/span> <span class=\"token punctuation\">}<\/span> from <span class=\"token string\">'lwc'<\/span><span class=\"token punctuation\">;<\/span>\nexport <span class=\"token keyword\">default<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MyComponent<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">LightningElement<\/span> <span class=\"token punctuation\">{<\/span>\n<span class=\"token punctuation\">}<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\"><\/div>\n<\/div>\n<\/div>\n<p>\u8be5\u00a0<code>export<\/code>\u8bed\u53e5\u5b9a\u4e49\u4e86\u6269\u5c55\u00a0<code>LightningElement<\/code>\u8be5\u7c7b\u7684\u7c7b\u3002\u6700\u4f73\u505a\u6cd5\u662f\uff0c\u7c7b\u7684\u540d\u79f0\u901a\u5e38\u4e0eJavaScript\u7c7b\u7684\u6587\u4ef6\u540d\u5339\u914d\uff0c\u4f46\u8fd9\u4e0d\u662f\u5fc5\u9700\u7684\u3002<\/p>\n<h2 id=\"the-lwc-module\">LWC\u6a21\u5757<\/h2>\n<p>Lightning Web Components\u4f7f\u7528\u6a21\u5757\uff08ECMAScript 6\u4e2d\u5f15\u5165\u4e86\u5185\u7f6e\u6a21\u5757\uff09\u6765\u6346\u7ed1\u6838\u5fc3\u529f\u80fd\uff0c\u5e76\u4f7f\u7ec4\u4ef6\u6587\u4ef6\u4e2d\u7684JavaScript\u53ef\u4ee5\u8bbf\u95ee\u5b83\u3002Lightning Web\u7ec4\u4ef6\u7684\u6838\u5fc3\u6a21\u5757\u662f\u00a0<code>lwc<\/code>\u3002<\/p>\n<p>\u4eceimport\u8bed\u53e5\u5f00\u59cb\u6a21\u5757\uff0c\u5e76\u6307\u5b9a\u7ec4\u4ef6\u4f7f\u7528\u7684\u6a21\u5757\u529f\u80fd\u3002<\/p>\n<p>\u8be5\u00a0<code>import<\/code>\u8bed\u53e5\u6307\u793aJavaScript\u4f7f\u7528\u6a21\u5757\u4e2d\u7684\u00a0<code>LightningElement<\/code>\u529f\u80fd\u00a0<code>lwc<\/code>\u3002<\/p>\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\"><span class=\"token comment\">\/\/ import module elements<\/span>\n<span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token class-name\">LightningElement<\/span><span class=\"token punctuation\">}<\/span> from <span class=\"token string\">'lwc'<\/span><span class=\"token punctuation\">;<\/span>\n<span class=\"token comment\">\/\/ declare class to expose the component<\/span>\nexport <span class=\"token keyword\">default<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">App<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">LightningElement<\/span> <span class=\"token punctuation\">{<\/span>\n    ready <span class=\"token operator\">=<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span>\n    <span class=\"token comment\">\/\/ use lifecycle hook<\/span>\n    <span class=\"token function\">connectedCallback<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\n        <span class=\"token function\">setTimeout<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">=<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token punctuation\">{<\/span>\n            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>ready <span class=\"token operator\">=<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n    <span class=\"token punctuation\">}<\/span>\n<span class=\"token punctuation\">}<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\"><\/div>\n<\/div>\n<\/div>\n<ul>\n<li>LightningElement\u662fLightning Web\u7ec4\u4ef6\u7684\u57fa\u7c7b\uff0c\u5b83\u5141\u8bb8\u6211\u4eec\u4f7f\u7528<code>connectedCallback()<\/code>\u3002<\/li>\n<li>\u8be5<code>connectedCallback()<\/code>\u65b9\u6cd5\u662f\u6211\u4eec\u751f\u547d\u5468\u671f\u7684\u94a9\u5b50\u4e4b\u4e00\u3002\u5728\u4e0b\u4e00\u8282\u4e2d\uff0c\u60a8\u5c06\u4e86\u89e3\u6709\u5173\u751f\u547d\u5468\u671f\u6302\u94a9\u7684\u66f4\u591a\u4fe1\u606f\u3002\u73b0\u5728\uff0c\u77e5\u9053\u5728\u5c06\u7ec4\u4ef6\u63d2\u5165\u6587\u6863\u5bf9\u8c61\u6a21\u578b\uff08DOM\uff09\u4e2d\u65f6\u89e6\u53d1\u8be5\u65b9\u6cd5\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5b83\u5c06\u542f\u52a8\u8ba1\u65f6\u5668\u3002<\/li>\n<\/ul>\n<h2 id=\"lifecycle-hooks\">\u751f\u547d\u5468\u671f\u6302\u94a9<\/h2>\n<p>Lightning Web Components\u63d0\u4f9b\u4e86\u4e00\u4e9b\u65b9\u6cd5\uff0c\u4f7f\u60a8\u53ef\u4ee5\u5c06\u4ee3\u7801\u201c\u6302\u94a9\u201d\u5230\u7ec4\u4ef6\u751f\u547d\u5468\u671f\u4e2d\u7684\u5173\u952e\u4e8b\u4ef6\u3002\u8fd9\u4e9b\u4e8b\u4ef6\u5305\u62ec\u7ec4\u4ef6\u4f55\u65f6\u4e3a\uff1a<\/p>\n<ul>\n<li>\u5df2\u5efa\u7acb<\/li>\n<li>\u6dfb\u52a0\u5230DOM<\/li>\n<li>\u5728\u6d4f\u89c8\u5668\u4e2d\u5448\u73b0<\/li>\n<li>\u9047\u5230\u9519\u8bef<\/li>\n<li>\u5df2\u4eceDOM\u4e2d\u5220\u9664<\/li>\n<\/ul>\n<p>\u4f7f\u7528\u56de\u8c03\u65b9\u6cd5\u54cd\u5e94\u4efb\u4f55\u8fd9\u4e9b\u751f\u547d\u5468\u671f\u4e8b\u4ef6\u3002\u4f8b\u5982\uff0c\u5c06\u00a0<code>connectedCallback()<\/code>\u7ec4\u4ef6\u63d2\u5165DOM\u65f6\u5c06\u8c03\u7528\u3002<code>disconnectedCallback()<\/code>\u5f53\u4eceDOM\u4e2d\u5220\u9664\u7ec4\u4ef6\u65f6\uff0c\u00a0\u5c06\u8c03\u7528\u3002<\/p>\n<p>\u5728\u6211\u4eec\u7528\u6765\u6d4b\u8bd5\u6761\u4ef6\u6e32\u67d3\u7684JavaScript\u6587\u4ef6\u4e2d\uff0c<code>connectedCallback()<\/code>\u5f53\u7ec4\u4ef6\u63d2\u5165DOM\u65f6\uff0c\u6211\u4eec\u4f7f\u7528\u4e86\u8be5\u00a0\u65b9\u6cd5\u81ea\u52a8\u6267\u884c\u4ee3\u7801\u3002\u4ee3\u7801\u7b49\u5f853\u79d2\u949f\uff0c\u7136\u540e\u8bbe\u7f6e<code>ready<\/code>\u4e3a\u00a0<code>true<\/code>\u3002<\/p>\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\"><span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token class-name\">LightningElement<\/span> <span class=\"token punctuation\">}<\/span> from <span class=\"token string\">'lwc'<\/span><span class=\"token punctuation\">;<\/span>\nexport <span class=\"token keyword\">default<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">App<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">LightningElement<\/span> <span class=\"token punctuation\">{<\/span>\n    ready <span class=\"token operator\">=<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span>\n    <span class=\"token function\">connectedCallback<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\n        <span class=\"token function\">setTimeout<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">=<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token punctuation\">{<\/span>\n            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>ready <span class=\"token operator\">=<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n    <span class=\"token punctuation\">}<\/span>\n<span class=\"token punctuation\">}<\/span><\/code><\/pre>\n<div class=\"toolbar\"><\/div>\n<\/div>\n<div class=\"box message info\">\n<div class=\"inner\">\n<div class=\"bd\">\n<div class=\"media\">\n<div class=\"mediaBd\">\n<h4 class=\"mbs\">\u6ce8\u610f<\/h4>\n<div class=\"message-media-content\">\n<p>\u5728VS Code\u4e4b\u7c7b\u7684\u7f16\u8f91\u5668\u4e2d\u4f7f\u7528\u6b64\u793a\u4f8b\u65f6\uff0c\u53ef\u80fd\u4f1a\u770b\u5230\u8be5<code>setTimeout()<\/code>\u51fd\u6570\u7684\u8b66\u544a\u6d88\u606f\u201c Restricted async operation &#8230;.\u201d\u00a0\u3002\u6b64\u8b66\u544a\u8868\u660e\u60a8\u4f7f\u7528\u7684\u5f02\u6b65\u64cd\u4f5c\u7ecf\u5e38\u88ab\u6ee5\u7528\uff1b\u5b83\u6839\u636e\u65f6\u95f4\u5ef6\u8fdf\u884c\u4e3a\uff0c\u800c\u4e0d\u662f\u7b49\u5f85\u4e8b\u4ef6\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u00a0<code>setTimeout()<\/code>\u9002\u5408\u6f14\u793a\u4efb\u610f\u65f6\u95f4\u5ef6\u8fdf\uff0c\u5e76\u4e14\u8b66\u544a\u4e0d\u5e94\u963b\u6b62\u60a8\u4f7f\u7528\u5b83\u3002<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p>\u53e6\u5916\uff0c\u8bf7\u6ce8\u610f\uff0c\u6211\u4eec\u4f7f\u7528\u4e86\u00a0<code>this<\/code>\u5173\u952e\u5b57\u3002\u5982\u679c\u60a8\u5df2\u7ecf\u7f16\u5199\u4e86JavaScript\uff0c\u90a3\u4e48\u5173\u952e\u5b57\u7684\u7528\u6cd5\u5e94\u8be5\u5f88\u719f\u6089\uff0c\u5e76\u4e14\u5176\u884c\u4e3a\u5c31\u50cf\u5728\u5176\u4ed6\u73af\u5883\u4e2d\u4e00\u6837\u3002<code>this<\/code>JavaScript\u4e2d\u7684\u00a0\u5173\u952e\u5b57\u6307\u7684\u662f\u5f53\u524d\u4e0a\u4e0b\u6587\u7684\u9876\u5c42\u3002\u5728\u8fd9\u91cc\uff0c\u4e0a\u4e0b\u6587\u662f\u6b64\u7c7b\u3002\u8be5\u00a0<code>connectedCallback()<\/code>\u65b9\u6cd5\u4e3a\u9876\u7ea7\u5c31\u7eea\u53d8\u91cf\u5206\u914d\u503c\u3002\u8fd9\u662f\u4e00\u4e2a\u5f88\u597d\u7684\u4f8b\u5b50\uff0c\u8bf4\u660e\u4e86Lightning Web Components\u5982\u4f55\u5c06JavaScript\u529f\u80fd\u5f15\u5165\u60a8\u7684\u5f00\u53d1\u3002\u60a8\u53ef\u4ee5<code>this<\/code>\u5728\u53c2\u8003\u8d44\u6599\u5c0f\u8282\u4e2d\u627e\u5230\u6709\u5173\u826f\u597d\u4fe1\u606f\u7684\u94fe\u63a5\u00a0\u3002<\/p>\n<p>\u6211\u4eec\u53d1\u5c55\u5f88\u5feb\uff0c\u60a8\u5df2\u7ecf\u53ef\u4ee5\u5c1d\u8bd5\u4e00\u4e9b\u65b9\u6cd5\u3002\u5728\u4e0b\u4e00\u4e2a\u5355\u5143\u4e2d\uff0c\u6211\u4eec\u5c06\u9000\u540e\u4e00\u6b65\uff0c\u8fdb\u4e00\u6b65\u8ba8\u8bba\u7ec4\u4ef6\u6240\u5904\u7684\u73af\u5883\u3002<\/p>\n<h2 id=\"decorators\">\u88c5\u9970\u5de5<\/h2>\n<p>\u88c5\u9970\u5668\u901a\u5e38\u5728JavaScript\u4e2d\u7528\u4e8e\u4fee\u6539\u5c5e\u6027\u6216\u51fd\u6570\u7684\u884c\u4e3a\u3002<\/p>\n<p>\u8981\u4f7f\u7528\u88c5\u9970\u5668\uff0c\u8bf7\u4ece<code>lwc<\/code>\u6a21\u5757\u5bfc\u5165\u88c5\u9970\u5668\uff0c\u00a0\u5e76\u5c06\u5176\u653e\u7f6e\u5728\u5c5e\u6027\u6216\u51fd\u6570\u4e4b\u524d\u3002<\/p>\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\"><span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token class-name\">LightningElement<\/span><span class=\"token punctuation\">,<\/span> api <span class=\"token punctuation\">}<\/span> from <span class=\"token string\">'lwc'<\/span><span class=\"token punctuation\">;<\/span>\nexport <span class=\"token keyword\">default<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MyComponent<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">LightningElement<\/span><span class=\"token punctuation\">{<\/span>\n    <span class=\"token annotation punctuation\">@api<\/span> message<span class=\"token punctuation\">;<\/span>\n<span class=\"token punctuation\">}<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\"><\/div>\n<\/div>\n<\/div>\n<p>\u60a8\u53ef\u4ee5\u5bfc\u5165\u591a\u4e2a\u88c5\u9970\u5668\uff0c\u4f46\u662f\u4e00\u4e2a\u5c5e\u6027\u6216\u51fd\u6570\u53ea\u80fd\u6709\u4e00\u4e2a\u88c5\u9970\u5668\u3002\u4f8b\u5982\uff0c\u5c5e\u6027\u4e0d\u80fd\u5177\u6709\u00a0<code>@api<\/code>\u548c\u00a0<code>@wire<\/code>\u88c5\u9970\u5668\u3002<\/p>\n<p>Lightning Web Components\u88c5\u9970\u5668\u7684\u793a\u4f8b\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>@api<\/strong>\uff1a\u5c06\u5b57\u6bb5\u6807\u8bb0\u4e3a\u516c\u5171\u3002\u516c\u5171\u5c5e\u6027\u5b9a\u4e49\u7ec4\u4ef6\u7684API\u3002\u5728\u5176HTML\u6807\u8bb0\u4e2d\u4f7f\u7528\u8be5\u7ec4\u4ef6\u7684\u6240\u6709\u8005\u7ec4\u4ef6\u53ef\u4ee5\u8bbf\u95ee\u8be5\u7ec4\u4ef6\u7684\u516c\u5171\u5c5e\u6027\u3002\u6240\u6709\u516c\u5171\u5c5e\u6027\u90fd\u662f\u53cd\u5e94\u6027\u7684\uff0c\u8fd9\u610f\u5473\u7740\u6846\u67b6\u4f1a\u89c2\u5bdf\u8be5\u5c5e\u6027\u4ee5\u8fdb\u884c\u66f4\u6539\u3002\u5f53\u5c5e\u6027\u503c\u66f4\u6539\u65f6\uff0c\u6846\u67b6\u4f1a\u505a\u51fa\u53cd\u5e94\u5e76\u91cd\u65b0\u6e32\u67d3\u7ec4\u4ef6\u3002<br \/>\n\u63d0\u793a\u5b57\u6bb5\u548c\u5c5e\u6027\u51e0\u4e4e\u662f\u53ef\u4ee5\u4e92\u6362\u7684\u672f\u8bed\u3002\u7ec4\u4ef6\u4f5c\u8005\u5728JavaScript\u7c7b\u4e2d\u58f0\u660e\u5b57\u6bb5\u3002\u8be5\u7c7b\u7684\u5b9e\u4f8b\u5177\u6709\u5c5e\u6027\u3002\u5bf9\u4e8e\u7ec4\u4ef6\u4f7f\u7528\u8005\uff0c\u5b57\u6bb5\u662f\u5c5e\u6027\u3002\u5728Lightning Web\u7ec4\u4ef6\u4e2d\uff0c\u53ea\u6709\u7ec4\u4ef6\u4f5c\u8005<code>@api<\/code>\u7528\u6765\u88c5\u9970\u7684\u5b57\u6bb5\u624d\u53ef\u4ee5\u4f5c\u4e3a\u5bf9\u8c61\u5c5e\u6027\u516c\u5f00\u7ed9\u6d88\u8d39\u8005\u3002<\/li>\n<li><strong>@track<\/strong>\uff1a\u544a\u8bc9\u6846\u67b6\u89c2\u5bdf\u5bf9\u8c61\u5c5e\u6027\u6216\u6570\u7ec4\u5143\u7d20\u7684\u66f4\u6539\u3002\u5982\u679c\u53d1\u751f\u66f4\u6539\uff0c\u6846\u67b6\u5c06\u91cd\u65b0\u6e32\u67d3\u8be5\u7ec4\u4ef6\u3002\u6240\u6709\u5b57\u6bb5\u90fd\u662f\u53cd\u5e94\u6027\u7684\u3002\u5982\u679c\u5b57\u6bb5\u7684\u503c\u53d1\u751f\u66f4\u6539\uff0c\u5e76\u4e14\u8be5\u5b57\u6bb5\u5728\u6a21\u677f\u4e2d\u4f7f\u7528\uff08\u6216\u5728\u6a21\u677f\u4e2d\u4f7f\u7528\u7684\u5c5e\u6027\u7684\u83b7\u53d6\u5668\u4e2d\u4f7f\u7528\uff09\uff0c\u5219\u6846\u67b6\u5c06\u91cd\u65b0\u6e32\u67d3\u8be5\u7ec4\u4ef6\u3002\u60a8\u65e0\u9700\u4f7f\u7528\u4fee\u9970\u5b57\u6bb5<code>@track<\/code>\u3002\u4f7f\u7528<code>@track<\/code>\u5982\u679c\u4e00\u4e2a\u5b57\u6bb5\u5305\u542b\u4e00\u4e2a\u5bf9\u8c61\u6216\u6570\u7ec4\u53ea\uff0c\u5982\u679c\u4f60\u60f3\u7684\u6846\u67b6\u6765\u89c2\u5bdf\u66f4\u6539\u5bf9\u8c61\u7684\u5c5e\u6027\u6216\u6570\u7ec4\u7684\u5143\u7d20\u3002\u5982\u679c\u8981\u66f4\u6539\u6574\u4e2a\u5c5e\u6027\u7684\u503c\uff0c\u5219\u65e0\u9700\u4f7f\u7528<code>@track<\/code>\u3002<br \/>\n\u572820\u5e74\u6625\u5b63\u4e4b\u524d\uff0c\u60a8\u5fc5\u987b\u4f7f\u7528<code>@track<\/code>\u5c06\u5b57\u6bb5\uff08\u4e5f\u79f0\u4e3a\u79c1\u6709\u5c5e\u6027\uff09\u6807\u8bb0\u4e3a\u53cd\u5e94\u6027\u3002\u60a8\u4e0d\u518d\u9700\u8981\u8fd9\u6837\u505a\u3002\u4f7f\u7528<code>@track<\/code>\u53ea\u544a\u8bc9\u6846\u67b6\u6765\u89c2\u5bdf\u53d8\u5316\u4e3a\u5bf9\u8c61\u7684\u5c5e\u6027\uff0c\u6216\u4e3a\u6570\u7ec4\u7684\u5143\u7d20\u3002\u4e00\u4e9b\u65e7\u7684\u793a\u4f8b\u53ef\u80fd\u4ecd\u4f1a<code>@track<\/code>\u5728\u4e0d\u9700\u8981\u7684\u5730\u65b9\u4f7f\u7528\uff0c\u4f46\u8fd9\u6ca1\u5173\u7cfb\uff0c\u56e0\u4e3a\u4f7f\u7528\u88c5\u9970\u5668\u4e0d\u4f1a\u66f4\u6539\u529f\u80fd\u6216\u7834\u574f\u4ee3\u7801\u3002\u6709\u5173\u66f4\u591a\u4fe1\u606f\uff0c\u8bf7\u53c2\u89c1\u6b64\u00a0\u53d1\u884c\u8bf4\u660e\u3002<\/li>\n<li><strong>@wire<\/strong>\uff1a\u4e3a\u60a8\u63d0\u4f9b\u4e00\u79cd\u4eceSalesforce\u7ec4\u7ec7\u83b7\u53d6\u548c\u7ed1\u5b9a\u6570\u636e\u7684\u7b80\u4fbf\u65b9\u6cd5\u3002<\/li>\n<\/ul>\n<p>\u8fd9\u662f\u4e00\u4e2a\u4f7f\u7528<code>@api<\/code>\u88c5\u9970\u5668\u4ece\u53e6\u4e00\u4e2a\u7ec4\u4ef6\uff08\u5e94\u7528\u7a0b\u5e8f\uff09\u4e2d\u7684\u4e00\u4e2a\u7ec4\u4ef6\uff08\u81ea\u884c\u8f66\uff09\u6e32\u67d3\u503c\u7684\u793a\u4f8b\u00a0\u3002\u5728\u7ec4\u4ef6\u6e38\u4e50\u573a\u4e2d\uff0c\u6587\u4ef6\u5982\u4e0b\u6240\u793a\uff1a<span class=\"image image-block\"><img decoding=\"async\" class=\"image image-block\" src=\"https:\/\/res.cloudinary.com\/hy4kyit2a\/f_auto,fl_lossy,q_70\/learn\/modules\/lightning-web-components-basics\/create-lightning-web-components\/images\/815926a476a4a976174778d75644b482_api-example-files.png\" alt=\"\u793a\u4f8b\u5e94\u7528\u7a0b\u5e8f\u6587\u4ef6\u7ed3\u6784\u3002\" \/><\/span><\/p>\n<p>\u8be5\u5e94\u7528\u7a0b\u5e8f\u7ec4\u4ef6\u4f7f\u7528\u4ee5\u4e0bHTML\u3002<\/p>\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\"><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">!<\/span><span class=\"token operator\">--<\/span> app<span class=\"token punctuation\">.<\/span>html <span class=\"token operator\">--<\/span><span class=\"token operator\">&gt;<\/span>\n<span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>template<span class=\"token punctuation\">&gt;<\/span><\/span>\n<span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>div<span class=\"token punctuation\">&gt;<\/span><\/span>\n    <span class=\"token operator\">&lt;<\/span>c<span class=\"token operator\">-<\/span>bike bike<span class=\"token operator\">=<\/span><span class=\"token punctuation\">{<\/span>bike<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>c<span class=\"token operator\">-<\/span>bike<span class=\"token operator\">&gt;<\/span>\n<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>div<span class=\"token operator\">&gt;<\/span>\n<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>template<span class=\"token operator\">&gt;<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\"><\/div>\n<\/div>\n<\/div>\n<p>\u8be5\u5e94\u7528\u7a0b\u5e8f\u7ec4\u4ef6\u4f7f\u7528\u4ee5\u4e0bJavaScript\u3002<\/p>\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\"><span class=\"token comment\">\/\/ app.js<\/span>\n<span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token class-name\">LightningElement<\/span> <span class=\"token punctuation\">}<\/span> from <span class=\"token string\">'lwc'<\/span><span class=\"token punctuation\">;<\/span>\nexport <span class=\"token keyword\">default<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">App<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">LightningElement<\/span> <span class=\"token punctuation\">{<\/span>\n    bike <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">{<\/span>\n        name<span class=\"token operator\">:<\/span> <span class=\"token string\">'Electra X4'<\/span><span class=\"token punctuation\">,<\/span>\n        picture<span class=\"token operator\">:<\/span> <span class=\"token string\">'https:\/\/s3-us-west-1.amazonaws.com\/sfdc-demo\/ebikes\/electrax4.jpg'<\/span>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span>\n<span class=\"token punctuation\">}<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\"><\/div>\n<\/div>\n<\/div>\n<p>\u81ea\u884c\u8f66\u7ec4\u4ef6\u4f7f\u7528\u4ee5\u4e0bHTML\u3002<\/p>\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\"><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">!<\/span><span class=\"token operator\">--<\/span> bike<span class=\"token punctuation\">.<\/span>html <span class=\"token operator\">--<\/span><span class=\"token operator\">&gt;<\/span>\n<span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>template<span class=\"token punctuation\">&gt;<\/span><\/span>\n    <span class=\"token operator\">&lt;<\/span>img src<span class=\"token operator\">=<\/span><span class=\"token punctuation\">{<\/span>bike<span class=\"token punctuation\">.<\/span>picture<span class=\"token punctuation\">}<\/span> alt<span class=\"token operator\">=<\/span><span class=\"token string\">\"bike picture\"<\/span> <span class=\"token operator\">\/<\/span><span class=\"token operator\">&gt;<\/span>\n    <span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>p<span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">{<\/span>bike<span class=\"token punctuation\">.<\/span>name<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>p<span class=\"token operator\">&gt;<\/span>\n<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>template<span class=\"token operator\">&gt;<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\"><\/div>\n<\/div>\n<\/div>\n<p>\u81ea\u884c\u8f66\u7ec4\u4ef6\u4f7f\u7528\u4ee5\u4e0bJavaScript\u3002<\/p>\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\"><span class=\"token comment\">\/\/ bike.js<\/span>\n<span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token class-name\">LightningElement<\/span><span class=\"token punctuation\">,<\/span> api <span class=\"token punctuation\">}<\/span> from <span class=\"token string\">'lwc'<\/span><span class=\"token punctuation\">;<\/span>\nexport <span class=\"token keyword\">default<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Bike<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">LightningElement<\/span> <span class=\"token punctuation\">{<\/span>\n    <span class=\"token annotation punctuation\">@api<\/span> bike<span class=\"token punctuation\">;<\/span>\n<span class=\"token punctuation\">}<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\"><\/div>\n<\/div>\n<\/div>\n<p>\u5728\u5e26\u6709\u548c\u4e0d\u5e26\u6709<code>@api<\/code>\u88c5\u9970\u5668\u7684\u7ec4\u4ef6\u6e38\u4e50\u573a\u4e2d\u5c1d\u8bd5\u4e00\u4e0b\uff0c\u00a0\u4ee5\u67e5\u770b\u884c\u4e3a\u3002<\/p>\n<h2 id=\"bonus-try-these-components-in-the-playground\">\u5956\u91d1\uff01\u5728\u64cd\u573a\u4e0a\u5c1d\u8bd5\u8fd9\u4e9b\u7ec4\u4ef6<\/h2>\n<p>\u65e2\u7136\u60a8\u5df2\u7ecf\u719f\u6089\u4e86\u7ec4\u4ef6\u64cd\u573a\uff0c\u90a3\u4e48\u82b1\u70b9\u65f6\u95f4\u5c1d\u8bd5\u4e00\u4e0bLightning Web Components 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