<!DOCTYPE html><html><head> <meta charset="UTF-8"> <title>Document</title> <!-- <script src="../react-15.3.1/build/react.min.js"></script> <script src="../react-15.3.1/build/react-dom.min.js"></script> --> <script src="https://unpkg.com/react@15/dist/react.js"></script><script src="https://unpkg.com/react-dom@15/dist/react-dom.js"></script></head><body> <div id="app"></div> <script type="text/jsx"> ReactDOM.render( <h1>Hello, world!</h1>, document.getElementById('app') ); </script></body></html>页面不会显示Hello,world啊，这是什么原因啊？
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