IT技术 - 目标容器不是 DOM 元素 React.js - 吾爱随笔录

我已经查看了所有其他有此问题的帖子，但我仍然对为什么会遇到此错误感到困惑。我确保我在我的

刚开始玩 React，所以我确信它很愚蠢。

我在这里先向您的帮助表示感谢。

代码如下。

索引.html

<html>
    <head>
    </head>
    <body>
        <div id="testing"></div>
        <script src="index.js"></script>
    </body>
</html>

索引.js

import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import App from './App';
import registerServiceWorker from './registerServiceWorker';

ReactDOM.render(<App />, document.getElementById('testing'));
registerServiceWorker();

完整的错误信息：

不变的

../app/node_modules/fbjs/lib/invariant.js:42 renderSubtreeIntoContainer
../app/node_modules/react-dom/cjs/react-dom.development.js:15144 render
../app/node_modules/react-dom/cjs/react-dom.development.js:15254
▲ 3 stack frames were expanded.
./src/index.js
../app/src/index.js:6
  3 | import './index.css';
  4 | import App from './App';
  5 | 
> 6 | ReactDOM.render(<App />, document.getElementById('testing'));
  7 | 
  8 | 
  9 | 
View compiled
▼ 6 stack frames were expanded.
__webpack_require__
../app/webpack/bootstrap 4755e61baeec1360d412:678
fn
../app/webpack/bootstrap 4755e61baeec1360d412:88
0
http://localhost:3000/static/js/bundle.js:35264:18
__webpack_require__
../app/webpack/bootstrap 4755e61baeec1360d412:678
./node_modules/ansi-regex/index.js.module.exports
../app/webpack/bootstrap 4755e61baeec1360d412:724
(anonymous function)
http://localhost:3000/static/js/bundle.js:728:10