微信小程序--下拉刷新与加载更多

下拉刷新

实现下拉刷新有两种方式
1.调用系统提供的下拉刷新的API
2.监听scroll-view,自定义下拉刷新，适合自定义下拉刷新样式的小程序，以首页为例
–home.json–

"enablePullDownRefresh": true

哪个页面需要下拉刷新，就在那个页面面对应的json文件配置上面这个属性，如果想整个项目都要用下拉刷新，可以在app.json的window里配置该属性。

–home.js–

  //下拉刷新
  onPullDownRefresh:function()
  {
    wx.showNavigationBarLoading() //在标题栏中显示加载
    //模拟加载
    setTimeout(function()
    {
      // complete
      wx.hideNavigationBarLoading() //完成停止加载
      wx.stopPullDownRefresh() //停止下拉刷新
    },1500);
  },

但是现在下拉刷新没有动画，在app.json中window配置整个系统的背景颜色,在没有配置背景颜色前系统默认背景颜色是白色，动画也是白色，所以看不到动画效果

"backgroundColor": "#f0145a"

加载更多

同理，实现加载更多也有两种方式

1. 调用系统的API
2. 监听scroll-view，bindscrolltolower滑动到底部的监听

第一种方法

–home.js–

  //加载更多
  onReachBottom: function () {
    console.log('加载更多')
    setTimeout(() => {
      this.setData({
        isHideLoadMore: true,
        recommends: [
          {
            goodId: 7,
            name: 'OLAY玉兰油精油沐浴露玫瑰滋养二合一450ml',
            url: 'bill',
            imageurl: 'http://mz.djmall.xmisp.cn/files/product/20161213/148162245074.jpg',
            newprice: "￥36.60",
            oldprice: "￥40.00",
          },
          {
            goodId: 10,
            name: '兰蔻玫瑰清滢保湿柔肤水嫩肤水化妆水400ml补水保湿温和不刺激',
            url: 'bill',
            imageurl: 'http://mz.djmall.xmisp.cn/files/product/20161201/148057937593.jpg',
            newprice: "￥30.00",
            oldprice: "￥80.00",
          }, {
            goodId: 11,
            name: 'Lancome/兰蔻清莹柔肤爽肤水/粉水400ml补水保湿玫瑰水化妆水',
            url: 'bill',
            imageurl: 'http://mz.djmall.xmisp.cn/files/product/20161201/148057953326.jpg',
            newprice: "￥30.00",
            oldprice: "￥80.00",
          },
          {
            goodId: 12,
            name: '美国CLINIQUE倩碧黄油无油/特效润肤露125ml',
            url: 'bill',
            imageurl: 'http://mz.djmall.xmisp.cn/files/product/20161201/14805828016.jpg',
            newprice: "￥239.00",
            oldprice: "￥320.00",
          },
          {
            goodId: 13,
            name: '法国LANCOME兰蔻柔皙轻透隔离防晒乳霜50ML2017年3月到期',
            url: 'bill',
            imageurl: 'http://mz.djmall.xmisp.cn/files/product/20161201/148058014894.jpg',
            newprice: "￥130.00",
            oldprice: "￥180.00",
          },
        ],
      })
    }, 1000)
  }

–home.wxml–

 <view class="weui-loadmore" hidden="{{isHideLoadMore}}">
    <view class="weui-loading"></view>
    <view class="weui-loadmore__tips">正在加载</view>
  </view>

–home.wxss–

/*  加载更多   */
.weui-loading {
  margin: 0 5px;
  width: 20px;
  height: 20px;
  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 {
  width: 65%;
  margin: 1.5em auto;
  line-height: 1.6em;
  font-size: 14px;
  text-align: center;
}
.weui-loadmore__tips {
  display: inline-block;
  vertical-align: middle;
}

weui-loading 样式里设置 background，data:image/svg+xml;base64这个是background的另一种用法，加入图片，这个图片还有点特别是base64格式，并用svg绘制的，当然你还可以直接把url里面写入图片路径也是可以的