bug?

        onLoad(e){
            setTimeout(() => {
                let that = this;
                uniCloud.callFunction({name: 'api',data: {action:e.ac,},
                    success: (e) => {
                        if (e.result.code == 0) {
                            var n = 1;
                            if(n === 0){
                                //this.detail = e.result.data.data['0']; // 这里用this不行。
                                console.log(e.result.data.data['0']);
                                //console.log(this.detail);
                            }else if(n === 1){
                                //that.detail = e.result.data.data['0']; // 这里用that也不行。
                                console.log(e.result.data.data['0']);                       
                            }else if(n === 2){
                                setTimeout(function(){
                                    this.detail = e.result.data.data['0']; //只有这里是对的
                                    console.log(this.detail);
                                },1);
                            }else{
                                setTimeout(function(){
                                    console.log(e.result.data.data['0']);
                                    that.detail = e.result.data.data['0'];//setTimeout里面用that也不对
                                },1);                           
                            }
                        } else {
                            uni.showModal({
                                content: e.result.message,
                                showCancel: false
                            })
                        }
                    },
                    fail: (e) => {
                        uni.showModal({
                            content: JSON.stringify(e),
                            showCancel: false
                        })
                    },
                    complete: () => {
                    }
                })              
            }, 0)    //箭头函数中的this总是指向外层调用者，也就是Obj           
        },