<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>Document</title>
<script src="https://cdn.bootcss.com/react/16.9.0-rc.0/umd/react.production.min.js"></script>
<script src="https://cdn.bootcss.com/react-dom/16.9.0-rc.0/umd/react-dom.production.min.js"></script>
</head>
<body></body>
</html>
只能留一个空div
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