起点上的页面传值js,有空研究下

<script>

 function ChangeParam(name, value) {
 var url = window.location.href;
 var newUrl = "";
 var reg = new RegExp("(^|)" + name + "=([^&]*)(|$)");
 var tmp = name + "=" + value;
 if (url.match(reg) != null) {
 newUrl = url.replace(eval(reg), tmp);
 }
 else {
 if (url.match("[\?]")) {
 newUrl = url + "&" + tmp;
 }
 else {
 newUrl = url + "?" + tmp;
 }
 }
 
 //如果更换了类别,则从第1页开始
 if (name != "PageIndex") {
 reg = new RegExp("(^|)PageIndex=([^&]*)(|$)");
 tmp = "PageIndex=1";
 if (newUrl.match(reg) != null) {
 newUrl = newUrl.replace(eval(reg), tmp);
 }
 }

 location.href = newUrl;
 }
 
 function QueryMonthTicket()
 {
 if($("selectM")!=null && $("selectY")!=null)
 {
 var month=$("selectY").value+$("selectM").value;
 ChangeParam("Month",month);
 } 
 }
 
 
 function GoPage()
 {
 var page=$("txtPage").value.trim();
 if(page.length===0){
 alert("请您输入页码");
 return false;
 };
 var strNum = '1234567890';
 var isNum = true;
 for(var i=0;i<page.length;i+=1){
 var c = page.charAt(i);
 if(strNum.indexOf(c) < 0){
 isNum = false;
 break;
 };
 };
 if(isNum){
 if(parseInt(page)>parseInt(initTotalPage)){
 alert("您输入的页数超过总页数，请重新输入！");
 return false;
 };
 ChangeParam("PageIndex",page);
 
 }else alert('您输入的信息有误，请重新输入！');
 }
 
 
 function GoEnter(evt){
 evt=evt||window.event;
 if(evt && evt.keyCode == 13) return GoPage();
};
 
</script>