小程序的下拉刷新和上拉加载更多，系统已经提供方法。我这里就是利用系统的方法，用自定义的UI和动画去实现。
先附上效果图
下拉刷新
上拉加载更多
- 第一步
想要利用系统的方法，首先要开启。开启方法：在相应的.json文件里面添加"enablePullDownRefresh": true（当然，这个是默认开启的，如果发现无法使用时，就手动再开启一次）
- 第二步
需要在相应的.wxss文件添加加载动画的样式
.weui-loadmore { width: 100%; height: 100rpx; font-size: 30rpx; text-align: center; margin-top: 30rpx;}.weui-loading { width: 50rpx; height: 50rpx; display: inline-block; vertical-align: middle; -webkit-animation: weuiLoading 1s steps(12, end) infinite; animation: weuiLoading 1s steps(12, end) infinite; background: transparent url(data:image/svg+xml;base64,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) no-repeat; background-size: 100%;}.weui-loadmore-tips { display: inline-block; vertical-align: middle;}- 第三步
在相应的.js文件添加标识
hasMoreData: true,isRefreshing: false,isLoadingMoreData: false- 第四步 下拉刷新和上拉加载更多
利用系统下拉刷新方法onPullDownRefresh
onPullDownRefresh: function () { if (this.data.isRefreshing || this.data.isLoadingMoreData) { return } this.setData({ isRefreshing: true, hasMoreData: true }) this.requestData()//数据请求 },利用系统的上拉加载更多方法onReachBottom
onReachBottom: function () { if (this.data.isRefreshing || this.data.isLoadingMoreData || !this.data.hasMoreData) { return } this.setData({ isLoadingMoreData: true }) this.requestData()//数据请求 },- 第五步 在相应的.wxml文件添加布局代码
（1）在列表的头部添加下拉刷新的布局
view class="weui-loadmore" wx:if='{{isRefreshing}}' view class="weui-loading"/view view class="weui-loadmore-tips"正在刷新.../view/view（2）在列表的底部添加上拉加载更多的布局
view wx:if='{{!isRefreshing}}' class="weui-loadmore" view wx:if='{{isLoadingMoreData}}' view class="weui-loading"/view view class="weui-loadmore-tips"正在加载更多.../view /view view wx:elif='{{hasMoreData}}' view class="weui-loadmore-tips" bindtap='onReachBottom'点击加载更多/view /view view wx:else view class="weui-loadmore-tips"没有更多内容啦/view /view/view至此，自定义的下拉刷新和上拉加载更多就完成了
