<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<script type="text/javascript" src=http://libs.baidu.com/jquery/1.9.1/jquery.js"></script>
<title>环境搭建</title>
</head>
<body>
<script type="text/javascript">alert($) </script>
</body>
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原文：http://www.cnblogs.com/aivnfjgj/p/6827846.html