JavaScript重定向URL参数的两种方法小结

function setUri(para, val) {
 var strNewUrl = new String();
 var strUrl = new String();
 var url = window.location.href;
 strUrl = window.location.href;
 
 if (strUrl.indexOf("?") != -1) {
 strUrl = strUrl.substr(strUrl.indexOf("?") + 1); //获取参数
 
 if (strUrl.toLowerCase().indexOf(para.toLowerCase()) == -1) { //如果没有找到参数,则直接赋值
 strNewUrl = url + "&" + para + "=" + val;
 window.location.href = strNewUrl;
 } else {
 var aParam = strUrl.split("&");
 
 for (var i = 0; i < aParam.length; i++) {
 if (aParam[i].substr(0, aParam[i].indexOf("=")).toLowerCase() == para.toLowerCase()) {
 aParam[i] = aParam[i].substr(0, aParam[i].indexOf("=")) + "=" + val;
 }
 }
 strNewUrl = url.substr(0, url.indexOf("?") + 1) + aParam.join("&");
 window.location.href = strNewUrl;
 }
 } else {
 strUrl += "?" + para + "=" + val;
 window.location.href = strUrl;
 }
 }

//使用正则
 function setPara(para, val) {
 var newpar = "";
 var url = window.location.href;
 var pars = location.search.substring(1);
 
 var reg = new RegExp("(^|)" + para + "=([^&]*)(|$)");
 if (reg.test(pars)) { //有需要的参数para
 
 var p1 = pars.split(para)[0]; //productID=100857&count=1&
 var p2 = pars.split(para)[1]; //=75825&coupval=1.5&addressID=358&invoiceID=1245&invoiceName=jesse
 
 if (p2.indexOf("&") > -1) {
 var p3 = p2.split("&")[0];
 if (p3 == "=" + val + "") {
 return false;
 }
 newpar = p1 + para + '=' + val + '&' + (p2.split(p3))[1];
 } else {
 if (p1) {
 newpar = p1 + para + '=' + val;
 } else {
 newpar = para + '=' + val;
 }
 }
 } else {
 if (url.indexOf("?") == -1) {
 newpar = pars +"&"+ para + "=" + val;
 } else {
 newpar = pars + "&" + para + "=" + val;
 }
 }
 window.location.href = location.href.split('?')[0] + "?" + newpar;
 }

<script>
window.onload = function () {
 var btn = document.getElementById("btnClick");
 
 btn.onclick = function () {
 
　　　　　　　　　　// url地址:http://localhost:54714/testuri.aspx?productID=100857&count=1&coupresId=12785&coupval=1.5&openId=12456&addressID=358&invoiceID=&invoiceName=
　　　　　　　　　 //setUri("coupresId", 0);
　　　　　　　　　　setPara("coupresId", 0); 
　　　　} 
　　}
</script>
 
<input type="button" id="btnClick" value="重定义参数" />