javascript js获取URL参数跳转

<script language="javascript" type="text/javascript">
function getQueryString(name) {
    var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)", "i");
    var r = window.location.search.substr(1).match(reg);
     if (r != null) return unescape(r[2]); return null;
 } 
t=new Date().getTime();
window.location.href="http://www.wmdfw.com/?ip="+getQueryString('i')+"&__ld="+getQueryString('ld')+"&__="+t;
</script>