<script type="text/javascript">
      function GetRequest(strName)
     {
           var strHref = window.location.href; //获取Url字串
           var intPos = strHref.indexOf("?");  // 参数开始位置
           var strRight = strHref.substr(intPos + 1);
           var arrTmp = strRight.split("&"); //参数分割符
           for(var i = 0; i < arrTmp.length; i++)
           {
                 var arrTemp = arrTmp[i].split("=");
                 if(arrTemp[0].toUpperCase() == strName.toUpperCase()) return arrTemp[1];
           }
           return "";
      }
</script>

<script>
      var id=GetRequest("ID") ;
     alert(id);
</script>