1.第一种
location.href="{:url('exportUserExcel')}?&k3="+k3+'&k4='+k4;
2.第二种
var province_id = 3;
var str = "{:U('article/getCity')}";
$("#city_id").load(str, {"pid" : province_id});
var str = "{:U('article/getCity')}";
$("#city_id").load(str, {"pid" : province_id});