js中通过数据库查询省，后自动带出市显示的问题

//注册地址
var province = SQL("select province from project where code='"+code+"' and isdelete=0 order by indate limit 1 ");
$("#field_2c923daf70a540290170aa8ad7a102ff").val(province);
var city = SQL("select city from project where code='"+code+"' and isdelete=0 order by indate limit 1 ");
$("#field_2c923daf70a540290170aa8b116b0302").val(city);
//联动带出市
$('#field_2c923daf70a540290170aa8ad7a102ff').trigger('change')
setTimeout(function () {
    $("#field_2c923daf70a540290170aa8b116b0302").val(city)
},500)