获取checkebox的check的个数

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<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
     <script src="../scripts/jquery/jquery-1.3.2.min.js" type="text/javascript"></script>
     <script type="text/javascript">
       function security() {
           var CheckCount = 0;
           $(".chks").each(function () {
//              $("[name='chks']").each(function () {
               if ($(this).attr("checked")) {
                   CheckCount++;
               }

           });
           alert(CheckCount);
   }
        </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <input name="chks1" class="chks" type="checkbox" onclick="security()"  />
      <input  name="chks2" class="chks" type="checkbox" onclick="security()"  />
    </div>
    </form>
</body>
</html>

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