为什么不能弹出窗口?
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<scirpt type="text/javascript" src="https://code.jquery.com/jquery-3.3.1.js"></scirpt>
<title></title>
</head>
<body>
<script type="text/javascript">alert($) </script>
</body>
</html>