js 设置url 参数值

//设置url中参数值
function setParam(param,value){
var query = location.search.substring(1);
var p = new RegExp("(^|)" + param + "=([^&]*)(|$)");
if(p.test(query)){
//query = query.replace(p,"$1="+value);
var firstParam=query.split(param)[0];
var secondParam=query.split(param)[1];
if(secondParam.indexOf("&")>-1){
var lastPraam=secondParam.split("&")[1];
return '?'+firstParam+'&'+param+'='+value+'&'+lastPraam;
}else{
if(firstParam){
return '?'+firstParam+'&'+param+'='+value;
}else{
return '?'+param+'='+value;
}
}
}else{
if(query == ''){
return '?'+param+'='+value;
}else{
return '?'+query+'&'+param+'='+value;
}
}
}//调用
var url=window.location.href;//获取当前url
var searchUrl=setParam("beginDate",date);
if(url.indexOf("?")>0){
=url.split("?")[0];
}
window.location.href=url+searchUrl;