导出数据为Excel文件-JS

var params=‘‘;
if(vahiclePlate!=‘‘){
    params=‘lpn‘+vahiclePlate;
}
if(startTime!=‘‘){
    params=params==‘‘?‘startTime=‘+startTime:(params+‘&‘)+‘startTime=‘+startTime;
}
.....搜索条件
if(params!=‘‘){
    params+=‘&‘+‘fileName=车队行程统计导出‘;
    params+=‘&‘+‘lpnName=车牌号‘;
    ....表头
    params+=‘&‘+‘sheetName=车队行程统计数据总汇‘;
    location.href="/etruck-portal/..../onExport?"+params;
}else{
    location.href="/etruck-portal/..../onExport";
}