else 部分哪里不对,为什么不能跳转到/page/address页面?
$('.txt_pro img').click(function(){
		if($(':input[type=checkbox]:checked').length == 0)
		{
			alert('must choose one product');return;
		}
		else
		{
			window.location.href="/page/address";
		}
	})
else 部分哪里不对,为什么不能跳转到/page/address页面?
------解决方案--------------------if($(':input[type=checkbox]:checked').length == 0)
你这一句向判断什么啊
判断页面有选中的复选框?还是什么的?
------解决方案--------------------
------解决方案--------------------<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
   <title></title>
   <script src="Scripts/jquery-1.4.1.js" type="text/javascript"></script>
   <script type="text/javascript">
       function ChangeDateFormat(jsondate) {
           jsondate = jsondate.replace("/Date(", "").replace(")/", "");
           if (jsondate.indexOf("+") > 0) {
               jsondate = jsondate.substring(0, jsondate.indexOf("+"));
           }
           else if (jsondate.indexOf("-") > 0) {
               jsondate = jsondate.substring(0, jsondate.indexOf("-"));
           }
           var date = new Date(parseInt(jsondate, 10));
           var month = date.getMonth() + 1 < 10 ? "0" + (date.getMonth() + 1) : date.getMonth() + 1;
           var currentDate = date.getDate() < 10 ? "0" + date.getDate() : date.getDate();
           return date.getFullYear() + "-" + month + "-" + currentDate;
       }
       $(document).ready(function () {
           $('.txt_pro img').click(function () {
               if ($(':input[type=checkbox]:checked').length == 0) {
                   alert('must choose one product'); return;
               }
               else {
                   window.location.href = "/page/address";
               }
           });
       });   
   </script>
</head>
<body>
   <form id="form1" runat="server">
   <div class="txt_pro img">
       <img src="images/Demo.png" />
   </div>
   <input type="checkbox" id="cb1" name="cb1" value="1">1</inpu><br />
   <input type="checkbox" id="cb2" name="cb2" value="2">2</inpu><br />
   <input type="checkbox" id="cb3" name="cb3" value="3">3</inpu><br />
   <input type="checkbox" id="cb4" name="cb4" value="4">4</inpu>
   </form>
</body>
</html>
这个是我测试的代码
可以正常运行
------解决方案--------------------<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
 <title></title>
 <script src="Scripts/jquery-1.4.1.js" type="text/javascript"></script>
 <script type="text/javascript">
 $(document).ready(function () {
 $('.txt_pro img').click(function () {
 if ($(':input[type=checkbox]:checked').length == 0) {
 alert('must choose one product'); return;
 }
 else {
 window.location.href = "/page/address";