JS添加修改URL参数

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;
}
}
location.href = newUrl;
}