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1.需要引用jquery.min.js库
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script type="text/javascript" src="css/jquery.min.js"></script>
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原文地址:http://www.cnblogs.com/HuiLove/p/4272997.html