<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8" />
<title>jQuery测试页-111cn.net</title>
</head>
<body>
<!-- 引入 jquery 1.8.0 -->
<script type="text/javascript" src="http://code.jquery.com/jquery-1.8.0.min.js"></script>
<script type="text/javascript">
var $180 = $;
</script>
<!-- 引入 jquery 1.9.0 -->
<script type="text/javascript" src="http://code.jquery.com/jquery-1.9.0.min.js"></script>
<script type="text/javascript">
var $190 = $;
</script>
<!-- 引入 jquery 2.0.0 -->
<script type="text/javascript" src="http://code.jquery.com/jquery-2.0.0.min.js"></script>
<script type="text/javascript">
var $200 = $;
</script>
<script type="text/javascript">
console.log($180.fn.jquery);
console.log($190.fn.jquery);
console.log($200.fn.jquery);
</script>
</body>
</html> 