//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urlvar searchUrl=setParam("beginDate",date);if(url.indexOf("?")>0){    =url.split("?")[0];}window.location.href=url+searchUrl;