uniapp上拉加载更多

data() {
   return { 
      pageNum: 1,
      hasMore: true,
      dataEnd: false,
   }
}

data() {
   return { 
      pageNum: 1, //请求第几页，默认为第一页
      hasMore: true, //判断有没有数据
   }
}，
onReachBottom() {
            this.handleTolower();
},

async getLIst() {
                uni.showLoading({
                    title: '加载中'
                });
                let da = await this.$myRequest({
                    url: 'index/goods/listGoodsByMerchantId',
                    data: {
                        pageNum: this.pageNum,
                        pageSize: 5,
                        merchantId: this.zzbb
                    },
                })
                setTimeout(function() {
                    uni.hideLoading();
                }, 400);
                if (da.data.page.dataList.length == 0) {
                    this.hasMore = false;
                    this.dataEnd = true;
                    uni.showLoading({
                        title: '已经到底了'
                    })
                    setTimeout(function() {
                        uni.hideLoading();
                    }, 400)
                    return;
                }
                this.dataList = [...this.dataList, ...da.data.page.dataList];
                uni.showLoading({
                    title: '加载完成'
                })
                setTimeout(function() {
                    uni.hideLoading();
                }, 200);
            },
            handleTolower() {
                if (this.hasMore) {
                    this.pageNum = this.pageNum + 1;
                    this.getLIst();
                } else {
                    this.dataEnd = true;
                }
            },