ReactDom没有定义?

Nit*_*ana 1 javascript reactjs react-dom

在此输入图像描述我正在尝试在reactjs中编写一个基本程序

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8" />
    <title>Hello React!</title>

    <script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.3.2/react.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.3.2/react-dom.min.js"></script> 
    <script src="https://unpkg.com/babel-core@5.8.38/browser.min.js"></script>
</head>
<body>
    <div id="example"></div>
    <script type="text/babel">
        ReactDOM.render(
        <h1>Hello, world!</h1>,
        document.getElementById('example')
        );
    </script>
</body>
</html>
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上面的程序运行正常.但是当我将脚本文件中的内容移动到单独的app.jsx文件时,它会显示未定义reactDom的错误.

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8" />
    <title>Hello React!</title>

    <script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.3.2/react.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.3.2/react-dom.min.js"></script> 
    <script src="https://unpkg.com/babel-core@5.8.38/browser.min.js"></script>
</head>
<body>
    <div id="example"></div>
    <script type="text/babel" src="app.jsx">

    </script>
</body>
</html>
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我的app.jsx看起来像:

ReactDom.render(
    <h1>Hello React!!!</h1>,
    document.getElementById('example')
)
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joe*_*ews 9

全局是ReactDOM(注意全DOM是大写).