{"id":4756,"date":"2023-01-04T18:09:10","date_gmt":"2023-01-04T10:09:10","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=4756"},"modified":"2023-01-04T18:09:10","modified_gmt":"2023-01-04T10:09:10","slug":"%e8%a7%a3%e6%b1%bareact-jserrorelementtypeisinvalid%e7%9a%84%e6%8a%80%e5%b7%a7-3","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/react-js\/%e8%a7%a3%e6%b1%bareact-jserrorelementtypeisinvalid%e7%9a%84%e6%8a%80%e5%b7%a7-3\/","title":{"rendered":"\u89e3\u6c7aReact.js&#8221;Error:Elementtypeisinvalid&#8221;\u7684\u6280\u5de7"},"content":{"rendered":"<p><meta name=\"keywords\" content=\"React.js, Error, Element type, Invalid, String, Built-in components, Composite components, undefined\"><\/p>\n<h1>\u89e3\u6c7a React.js &#8220;Error: Element type is invalid: expected a string (for built-in components) or a class\/function (for composite components) but got: undefined&#8221; \u932f\u8aa4<\/h1>\n<p>React.js \u662f\u4e00\u500b\u7528\u65bc\u69cb\u5efa\u7528\u6236\u754c\u9762\u7684 JavaScript \u5eab\uff0c\u5b83\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u66f4\u8f15\u9b06\u5730\u69cb\u5efa\u9ad8\u6027\u80fd\u7684\u7db2\u9801\u61c9\u7528\u7a0b\u5e8f\u3002\u7136\u800c\uff0c\u5728\u4f7f\u7528 React.js \u6642\uff0c\u958b\u767c\u8005\u53ef\u80fd\u6703\u9047\u5230\u4e00\u500b\u5e38\u898b\u7684\u932f\u8aa4\uff1a\u201cError: Element type is invalid: expected a string (for built-in components) or a class\/function (for composite components) but got: undefined\u201d\u3002<\/p>\n<p>\u9019\u500b\u932f\u8aa4\u7684\u539f\u56e0\u662f\u56e0\u70ba React.js \u5c0d\u65bc\u5143\u7d20\u7684\u985e\u578b\u6709\u4e00\u5b9a\u7684\u8981\u6c42\uff0c\u800c\u958b\u767c\u8005\u5728\u69cb\u5efa\u5143\u7d20\u6642\u6c92\u6709\u6309\u7167\u8981\u6c42\u63d0\u4f9b\u6b63\u78ba\u7684\u985e\u578b\u3002<\/p>\n<p><!--more--><\/p>\n<p>\u8981\u89e3\u6c7a\u9019\u500b\u932f\u8aa4\uff0c\u958b\u767c\u8005\u9700\u8981\u78ba\u4fdd\u4ed6\u5011\u5728\u69cb\u5efa\u5143\u7d20\u6642\u63d0\u4f9b\u6b63\u78ba\u7684\u985e\u578b\u3002\u4f8b\u5982\uff0c\u5982\u679c\u958b\u767c\u8005\u60f3\u8981\u69cb\u5efa\u4e00\u500b\u5167\u5efa\u7684 React \u7d44\u4ef6\uff0c\u4ed6\u5011\u9700\u8981\u63d0\u4f9b\u4e00\u500b\u5b57\u7b26\u4e32\uff0c\u800c\u4e0d\u662f\u4e00\u500b\u51fd\u6578\u6216\u985e\u3002<\/p>\n<p>\u8209\u4f8b\u4f86\u8aaa\uff0c\u5982\u679c\u958b\u767c\u8005\u60f3\u8981\u69cb\u5efa\u4e00\u500b <code>&lt;div&gt;<\/code> \u5143\u7d20\uff0c\u4ed6\u5011\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u78bc\uff1a<\/p>\n<pre class=\"brush: javascript\">\nReact.createElement('div', {}, 'Hello World!');\n<\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u958b\u767c\u8005\u63d0\u4f9b\u4e86\u4e00\u500b\u5b57\u7b26\u4e32\u4f5c\u70ba\u7b2c\u4e00\u500b\u53c3\u6578\uff0c\u9019\u500b\u5b57\u7b26\u4e32\u6307\u5b9a\u4e86\u8981\u69cb\u5efa\u7684\u5143\u7d20\u7684\u985e\u578b\uff0c\u4e5f\u5c31\u662f <code>&lt;div&gt;<\/code>\u3002<\/p>\n<p>\u53e6\u5916\uff0c\u5982\u679c\u958b\u767c\u8005\u60f3\u8981\u69cb\u5efa\u4e00\u500b\u81ea\u5b9a\u7fa9\u7684 React \u7d44\u4ef6\uff0c\u4ed6\u5011\u9700\u8981\u63d0\u4f9b\u4e00\u500b\u51fd\u6578\u6216\u985e\uff0c\u800c\u4e0d\u662f\u4e00\u500b\u5b57\u7b26\u4e32\u3002\u8209\u4f8b\u4f86\u8aaa\uff0c\u5982\u679c\u958b\u767c\u8005\u60f3\u8981\u69cb\u5efa\u4e00\u500b\u81ea\u5b9a\u7fa9\u7684 React \u7d44\u4ef6\uff0c\u4ed6\u5011\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u78bc\uff1a<\/p>\n<pre class=\"brush: javascript\">\nclass MyComponent extends React.Component {\n  render() {\n    return <div>Hello World!<\/div>;\n  }\n}\n\nReact.createElement(MyComponent, {});\n<\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u958b\u767c\u8005\u63d0\u4f9b\u4e86\u4e00\u500b\u51fd\u6578\u6216\u985e\u4f5c\u70ba\u7b2c\u4e00\u500b\u53c3\u6578\uff0c\u9019\u500b\u51fd\u6578\u6216\u985e\u6307\u5b9a\u4e86\u8981\u69cb\u5efa\u7684\u5143\u7d20\u7684\u985e\u578b\uff0c\u4e5f\u5c31\u662f\u81ea\u5b9a\u7fa9\u7684 React \u7d44\u4ef6\u3002<\/p>\n<p>\u7e3d\u4e4b\uff0c\u5982\u679c\u958b\u767c\u8005\u60f3\u8981\u89e3\u6c7a React.js \u201cError: Element type is invalid: expected a string (for built-in components) or a class\/function (for composite components) but got: undefined\u201d \u932f\u8aa4\uff0c\u4ed6\u5011\u9700\u8981\u78ba\u4fdd\u4ed6\u5011\u5728\u69cb\u5efa\u5143\u7d20\u6642\u63d0\u4f9b\u6b63\u78ba\u7684\u985e\u578b\uff0c\u5982\u679c\u662f\u5167\u5efa\u7684 React \u7d44\u4ef6\uff0c\u4ed6\u5011\u9700\u8981\u63d0\u4f9b\u4e00\u500b\u5b57\u7b26\u4e32\uff0c\u5982\u679c\u662f\u81ea\u5b9a\u7fa9\u7684 React 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