vue vant列表页下拉刷新，上拉加载

<div id="app" v-cloak>
            <div class="header fixed_top background_FFF border_beee"></div>
            <!-- 内容 -->
            <div class="main_container" style="padding-top:2.75rem">
                <van-pull-refresh v-model="isLoading" success-text="刷新成功" @refresh="onRefresh">

                    <van-list v-model="loading" :finished="finished" :finished-text="finishedText" @load="onLoad"
                        :immediate-check="false">

                        <div id="list-content" class="list-rowbar">
                            <div class="shop-item" v-if="list!=null && list.length>0" v-for="(item,index) in list" ></div>

                            <!-- 当无数据时 -->
                            <nodata-tapbar :show="shoplist==null || shoplist.length==0" />

                        </div>

                    </van-list>
                    
                </van-pull-refresh>

            </div>
        </div>

var vm = new Vue({
    el: "#app",
    data: {
        searchInfo: {
            latitude: '',
            longitude: '',
        }, //接口参数
        list: [], //列表
        isLoading: false, //下拉刷新
        loading: false, //上拉加载
        finished: false, //已加载完  
        finishedText: '~我也是有底线的~',
        Pages: {
            curPage: 1,
            pageSize: 10,
            count: 0,
            countPage: 0,
        },
    },
    created() {
    　　this.requestTheLists();
    },
    mounted() {
        setTimeout(function() {
            var winHeight = document.documentElement.clientHeight //视口大小
            var headerHeight = document.getElementsByClassName('header')[0].clientHeight;
            document.getElementById('list-content').style.minHeight = (winHeight - headerHeight + 10) +
                'px' //调整上拉加载框高度
        }, 200);
    },
    methods: {
        //获取换购商品详情信息
        requestTheLists: function() {
            //传递经纬度的值给后台
            var _this = this;
            var params = {
                latitude: this.searchInfo.latitude,
                longitude: this.searchInfo.longitude,
                curPage: this.Pages.curPage,
                pageSize: this.Pages.pageSize,
            }
            dataMainModule.queryDigitalRedEnvelopeExchangePage(params, function(res) {
                _this.isLoading = false;
                _this.loading = false;
                if (res.retCode == 200) {
                    if (_this.Pages.curPage <= 1) {
                        _this.shoplist = res.page.records;
                    } else {
                        _this.shoplist = _this.shoplist.concat(res.page.records);
                    }
                    _this.Pages.count = res.page.total;
                    _this.Pages.countPage = res.page.pages;
                    // 数据全部加载完成
                    if (res.page.total === 0) {
                        _this.finished = true;
                        _this.finishedText = '';
                    } else {
                        if (common.numberMul(_this.Pages.curPage, _this.Pages.pageSize) >= res.page
                            .total) {
                            _this.finished = true;
                            _this.finishedText = '~我也是有底线的~';
                        }
                    }
                }
            }, function(res) {
                _this.isLoading = false;
                _this.loading = false;
                _this.$toast(res.msg);
            })
        },
        onRefresh: function() {
            //下拉刷新
            var _this = this;
            setTimeout(function() {
                _this.Pages.curPage = 1;
                _this.finished = false;
                _this.requestTheLists();
            }, 1000);
        },
        onLoad: function() {
            //上拉加载
            var _this = this;
            if (this.loading && !this.isLoading) {
                if (common.numberMul(this.Pages.curPage, this.Pages.pageSize) < this.Pages.count) {
                    this.Pages.curPage += 1;
                    setTimeout(function() {
                        _this.requestTheLists();
                    }, 1000);
                } else {
                    _this.isLoading = false;
                    _this.loading = false;
                }
            }
        },
    }
})