{"id":5576,"date":"2022-03-18T13:04:16","date_gmt":"2022-03-18T05:04:16","guid":{"rendered":"http:\/\/39.106.39.94\/?p=5576"},"modified":"2022-04-14T10:31:07","modified_gmt":"2022-04-14T02:31:07","slug":"react%e5%85%a5%e9%97%a8","status":"publish","type":"post","link":"https:\/\/lilichao.com\/?p=5576","title":{"rendered":"React\u5165\u95e8"},"content":{"rendered":"\n<h2 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DOM\u4f7f\u5f97\u5c40\u90e8\u5237\u65b0\u6210\u4e3a\u4e86\u53ef\u80fd\uff0c\u4f46\u4e00\u5207\u4f3c\u4e4e\u5e76\u4e0d\u662f\u90a3\u4e48\u7684\u5b8c\u7f8e\u3002\u53d1\u9001\u8bf7\u6c42\u52a0\u8f7d\u6570\u636e\u95ee\u9898\u4e0d\u5927\uff0c\u4f46\u6570\u636e\u4e00\u65e6\u52a0\u8f7d\u8fc7\u6765\u95ee\u9898\u5c31\u51fa\u73b0\u4e86\u3002\u6570\u636e\u5e76\u4e0d\u80fd\u76f4\u63a5\u5728\u7f51\u9875\u4e2d\u663e\u793a\u3002\u6211\u4eec\u9700\u8981\u901a\u8fc7DOM\u5c06\u6570\u636e\u8f6c\u6362\u4e3a\u7f51\u9875\u7684\u4e2d\u7684\u5404\u79cd\u8282\u70b9\uff0c\u8fd9\u5c31\u610f\u5473\u7740\u6211\u4eec\u5fc5\u987b\u53cd\u590d\u7684\u64cd\u4f5cDOM\uff0c\u8fd9\u5176\u4e2d\u7684\u75db\u82e6\u5b9e\u5728\u662f\u4e00\u8a00\u96be\u5c3d\u3002\u4e00\u6765DOM\u64cd\u4f5c\u672c\u8eab\u5341\u5206\u5360\u7528\u7cfb\u7edf\u8d44\u6e90\u4e00\u4e0d\u5c0f\u5fc3\u5c31\u4f1a\u51fa\u73b0\u5361\u987f\u3002\u4e8c\u6765DOM\u7684API\u5341\u5206\u7e41\u590d\uff0c\u4f7f\u5f97\u5404\u79cd\u64cd\u4f5c\u5e76\u4e0d\u5341\u5206\u7684\u4f18\u96c5\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u670d\u52a1\u5668\u7684\u590d\u6742\u5ea6\u964d\u4f4e\u4e86\uff0c\u4f46\u662f\u524d\u7aef\u7684\u590d\u6742\u5ea6\u63d0\u9ad8\u4e86\u3002<\/p>\n\n\n\n<p>\u4e8e\u662f\u5728\u524d\u7aef\u5f00\u53d1\u4e2d\u5c31\u6025\u9700\u4e00\u4e2a\u6846\u67b6\u6765\u5e2e\u52a9\u6211\u4eec\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u4f7f\u6211\u4eec\u53ef\u4ee5\u6bd4\u8f83\u8f7b\u677e\u7684\u6839\u636e\u4e0d\u540c\u7684\u6570\u636e\u6765\u5feb\u901f\u6784\u5efa\u7528\u6237\u754c\u9762\uff08UI\uff09\uff0c\u4e0e\u6b64\u540c\u65f6\u8fd8\u8981\u5728\u6784\u5efa\u8fc7\u7a0b\u4e2d\u786e\u4fdd\u5176\u6d41\u7545\u5ea6\uff08\u4e0d\u80fd\u51fa\u73b0\u5361\u987f\uff09\u3002\u4e8e\u662fReact\u3001Angular\u3001Vue\u8fd9\u4e9b\u524d\u7aef\u6846\u67b6\u5e94\u8fd0\u800c\u751f\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">React\u7b80\u4ecb<\/h2>\n\n\n\n<p><strong>React<\/strong> \u662f\u4e00\u4e2a\u7528\u4e8e\u6784\u5efa\u7528\u6237\u754c\u9762\u7684 JavaScript \u5e93\uff0c\u7528\u6765\u4e3a\u73b0\u4ee3\u7684\u7f51\u7edc\u6784\u5efa\u7528\u6237\u754c\u9762\u3002React\u8d77\u6e90\u4e8eFacebook\uff0c\u7531Facebook\u7684\u8f6f\u4ef6\u5de5\u7a0b\u5e08 Jordan Walke \u5f00\u53d1\uff0c2012\u5e74\u90e8\u7f72\u4e8e Instagram\uff0c2013\u5e74\u5f00\u6e90\u3002\u9664\u6b64\u4e4b\u5916\uff0cReact\u8fd8\u6709React Native\u6846\u67b6\uff0c\u901a\u8fc7\u5b83\u8ba9\u6211\u4eec\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528 JavaScript \u6765\u7f16\u5199\u539f\u751f\u5e94\u7528\u3002<\/p>\n\n\n\n<p>React\u7684\u7279\u70b9\uff1a<\/p>\n\n\n\n<ul><li>\u865a\u62dfDOM<\/li><li>\u58f0\u660e\u5f0f<\/li><li>\u57fa\u4e8e\u7ec4\u4ef6<\/li><li>\u652f\u6301\u670d\u52a1\u5668\u7aef\u6e32\u67d3<\/li><li>\u5feb\u901f\u3001\u7b80\u5355\u3001\u6613\u5b66<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">HelloWorld<\/h2>\n\n\n\n<p>React\u7684\u5e38\u89c4\u5f00\u53d1\u65b9\u5f0f\u5e76\u4e0d\u662f\u901a\u8fc7\u6d4f\u89c8\u5668\u5f15\u5165\u5916\u90e8js\u811a\u672c\u6765\u4f7f\u7528\uff0c\u4f46\u5728\u5165\u95e8\u9636\u6bb5\u6211\u4eec\u6682\u4e14\u5148\u4f7f\u7528\u8fd9\u79cd\u65b9\u5f0f\u6765\u7b80\u5355\u4f53\u4f1a\u4e00\u4e0bReact\u3002<\/p>\n\n\n\n<p>\u4f7f\u7528React\u5f00\u53d1Web\u9879\u76ee\uff0c\u6211\u4eec\u9700\u8981\u5f15\u5165\u4e24\u4e2ajs\u811a\u672c\uff1a<\/p>\n\n\n\n<p><code>react.development.js<\/code><\/p>\n\n\n\n<ul><li>react \u662freact\u6838\u5fc3\u5e93\uff0c\u53ea\u8981\u4f7f\u7528react\u5c31\u5fc5\u987b\u8981\u5f15\u5165<\/li><li>\u4e0b\u8f7d\u5730\u5740\uff1ahttps:\/\/unpkg.com\/react@18.0.0\/umd\/react.development.js<\/li><\/ul>\n\n\n\n<p><code>react-dom.development.js<\/code><\/p>\n\n\n\n<ul><li>react-dom \u662freact\u7684dom\u5305\uff0c\u4f7f\u7528react\u5f00\u53d1web\u5e94\u7528\u65f6\u5fc5\u987b\u5f15\u5165<\/li><li>\u4e0b\u8f7d\u5730\u5740\uff1ahttps:\/\/unpkg.com\/react-dom@18.0.0\/umd\/react-dom.development.js<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-preformatted\">&lt;!DOCTYPE html&gt;\n&lt;html lang=\"zh\"&gt;\n&lt;head&gt;\n &nbsp; &nbsp;&lt;meta charset=\"UTF-8\"&gt;\n &nbsp; &nbsp;&lt;title&gt;Hello React&lt;\/title&gt;\n &nbsp; &nbsp;&lt;script src=\"script\/react.development.js\"&gt;&lt;\/script&gt;\n &nbsp; &nbsp;&lt;script src=\"script\/react-dom.development.js\"&gt;&lt;\/script&gt;\n&lt;\/head&gt;\n&lt;body&gt;\n    &lt;div id=\"root\"&gt;&lt;\/div&gt;\n    &lt;script&gt;\n      const button = React.createElement('button', {\n         onClick: (e) =&gt; {\n            alert('\u4f60\u70b9\u4e86\u6309\u94ae\uff01');\n            e.stopPropagation();\n         }\n      }, '\u6211\u662f\u4e00\u4e2a\u6309\u94ae');\n\u200b\n      const box = React.createElement('div', {\n          onClick: (e) =&gt; {\n          alert('\u4f60\u70b9\u4e86div\uff01');\n &nbsp; &nbsp; &nbsp;     console.log(e);\n &nbsp; &nbsp; &nbsp; }\n &nbsp; &nbsp;}, '\u6211\u662f\u4e00\u4e2adiv', button);\n\u200b\n &nbsp; &nbsp;const root = ReactDOM.createRoot(document.querySelector('#root'));\n\n &nbsp; &nbsp;root.render(box);\n\u200b\n    &lt;\/script&gt;\n&lt;\/body&gt;\n&lt;\/html&gt;<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u4e2aAPI<\/h2>\n\n\n\n<ul><li><code>React.createElement()<\/code><ul><li><code>React.createElement(type, [props], [...children])<\/code><\/li><li>\u7528\u6765\u521b\u5efaReact\u5143\u7d20<\/li><li>React\u5143\u7d20\u65e0\u6cd5\u4fee\u6539<\/li><\/ul><\/li><li><code>ReactDOM.createRoot()<\/code><ul><li><code>createRoot(container[, options])<\/code><\/li><li>\u7528\u6765\u521b\u5efaReact\u7684\u6839\u5bb9\u5668\uff0c\u5bb9\u5668\u7528\u6765\u653e\u7f6eReact\u5143\u7d20<\/li><\/ul><\/li><li><code>root.render()<\/code><ul><li><code>root.render(element)<\/code><\/li><li>\u5f53\u9996\u6b21\u8c03\u7528\u65f6\uff0c\u5bb9\u5668\u8282\u70b9\u91cc\u7684\u6240\u6709 DOM \u5143\u7d20\u90fd\u4f1a\u88ab\u66ff\u6362\uff0c\u540e\u7eed\u7684\u8c03\u7528\u5219\u4f1a\u4f7f\u7528 React \u7684 DOM \u5dee\u5206\u7b97\u6cd5\uff08DOM diffing algorithm\uff09\u8fdb\u884c\u9ad8\u6548\u7684\u66f4\u65b0\u3002<\/li><li>\u4e0d\u4f1a\u4fee\u6539\u5bb9\u5668\u8282\u70b9\uff08\u53ea\u4f1a\u4fee\u6539\u5bb9\u5668\u7684\u5b50\u8282\u70b9\uff09\u3002\u53ef\u4ee5\u5728\u4e0d\u8986\u76d6\u73b0\u6709\u5b50\u8282\u70b9\u7684\u60c5\u51b5\u4e0b\uff0c\u5c06\u7ec4\u4ef6\u63d2\u5165\u5df2\u6709\u7684 DOM \u8282\u70b9\u4e2d\u3002<\/li><\/ul><\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">JSX\uff08JavaScript Syntax Extension\uff09<\/h2>\n\n\n\n<p>JSX \u662f JavaScript \u7684\u8bed\u6cd5\u6269\u5c55\uff0cJSX \u4f7f\u5f97\u6211\u4eec\u53ef\u4ee5\u4ee5\u7c7b\u4f3c\u4e8e HTML \u7684\u5f62\u5f0f\u53bb\u4f7f\u7528 JS\u3002JSX\u4fbf\u662fReact\u4e2d\u58f0\u660e\u5f0f\u7f16\u7a0b\u7684\u4f53\u73b0\u65b9\u5f0f\u3002\u58f0\u660e\u5f0f\u7f16\u7a0b\uff0c\u7b80\u5355\u7406\u89e3\u5c31\u662f\u4ee5\u7ed3\u679c\u4e3a\u5bfc\u5411\u7684\u7f16\u7a0b\u3002\u4f7f\u7528JSX\u5c06\u6211\u4eec\u6240\u671f\u671b\u7684\u7f51\u9875\u7ed3\u6784\u7f16\u5199\u51fa\u6765\uff0c\u7136\u540eReact\u518d\u6839\u636eJSX\u81ea\u52a8\u751f\u6210JS\u4ee3\u7801\u3002\u6240\u4ee5\u6211\u4eec\u6240\u7f16\u5199\u7684JSX\u4ee3\u7801\uff0c\u6700\u7ec8\u90fd\u4f1a\u8f6c\u6362\u4e3a\u4ee5\u8c03\u7528<code>React.createElement()<\/code>\u521b\u5efa\u5143\u7d20\u7684\u4ee3\u7801\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">const element = &lt;h1&gt;Hello, world!&lt;\/h1&gt;; \/\/ React.createElement('h1', {}, 'Hello, world!')<\/pre>\n\n\n\n<pre class=\"wp-block-preformatted\">const name = 'Josh Perez';\nconst element = &lt;h1&gt;Hello, {name}&lt;\/h1&gt;;\n\u200b\nconst root = ReactDOM.createRoot(document.querySelector('#root'));\nroot.render(element);<\/pre>\n\n\n\n<pre class=\"wp-block-preformatted\">function formatName(user) {\n &nbsp;return user.firstName + ' ' + user.lastName;\n}\n\u200b\nconst user = {\n &nbsp;firstName: 'Harper',\n &nbsp;lastName: 'Perez'\n};\n\u200b\nconst element = (\n &nbsp;&lt;h1&gt;\n &nbsp;  Hello, {formatName(user)}!\n &nbsp;&lt;\/h1&gt;\n);\n\u200b\nconst root = 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id=\"app\"&gt;&lt;\/div&gt;<br>\u200b<br>&lt;script type=\"text\/babel\"&gt;<br> &nbsp;  const h1 = &lt;h1&gt;Hello React&lt;\/h1&gt;;<br> &nbsp;  ReactDOM.render(h1, document.querySelector('#app'));<br>&lt;\/script&gt;<br>&lt;\/body&gt;<br>&lt;\/html&gt;<\/pre>\n\n\n\n<p>babel\u4e0b\u8f7d\u5730\u5740\uff1ahttps:\/\/unpkg.com\/babel-standalone@6\/babel.min.js<\/p>\n\n\n\n<p>\u5728JSX\u4e2d\u53ef\u4ee5\u76f4\u63a5\u901a\u8fc7 {} \u6765\u5d4c\u5165 JS\u8868\u8fbe\u5f0f\uff0c\u6240\u8c13\u7684\u8868\u8fbe\u5f0f\u6307\u7684\u662f\u6709\u8fd4\u56de\u503c\u7684\u8bed\u53e5\u3002\u6bd4\u5982\u53ef\u4ee5\u76f4\u63a5\u5728JSX\u4e2d\u5d4c\u5165\u503c\u6216\u53d8\u91cf\u50cf\u8fd9\u6837\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">const name = '\u5b59\u609f\u7a7a';<br>const ele = &lt;h1&gt;Hello {name}&lt;\/h1&gt;;<br>const ele2 = &lt;h1&gt;Hello {\u5b59\u609f\u7a7a}&lt;\/h1&gt;;<br>const ele3 = &lt;h1&gt;1 + 1 = {1 + 1}&lt;\/h1&gt;;<\/pre>\n\n\n\n<p>{} 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