uni-app如何解决在for循环里调用异步请求获取数据顺序混乱问题？

that.list = res.datas.class_list;
                            
for(var i=0;i<that.list.length;i++){

that.list = res.datas.class_list;
                            
    var i = 0;

    getImg();
    function getImg() {
        if (i >= that.list.length) {
        return;
    }
    that.list[i].tlist = []
    var url = "w=goods_class&gc_id=" + that.list[i].gc_id.substring(2);
    that.thtxb_ajax_request(url, {}).then((res) => {
        that.tlist.push(res.datas.class_list)
        i++
        getImg();
        })
    }