微信小程序圖片延遲加載，複製即用。

原文鏈接：https://blog.csdn.net/perfly_z/article/details/86611461

wxml

<view class="content">
  <block wx:key="{{img}}" wx:for="{{img}}">
    <view class="pic-list">
      //listIndex大於item.index時，圖片顯示
      <image src="{{ listIndex > index ? item : '' }}" class="pic {{listIndex > index ?'Action':''}}" mode="widthFix" />
    </view>
  </block>
</view>

wxss

page {
 background: #fff;
}
.pic-list {
 width: 100vw;
 background: #efeff4;
 margin: 3vw 0;
}
.pic {
 width: 100%;
 display: block;
 opacity: 0;
 transition: opacity 0.3s linear 0.3s;
}
.Action {
 opacity: 1;
}

wxjs

 onShow: function () {
    //獲取屏幕尺寸
    const screenWidth = wx.getSystemInfoSync().windowWidth
    const screenHeight = wx.getSystemInfoSync().windowHeight
    this.setData({
      //獲取頁面初始狀態圖片數量，0.63爲圖片容器的高度值(63vw)，將代碼中0.63改爲你的容器對應高度
      listIndex: screenHeight / (screenWidth * 0.63),
      screenWidth: screenWidth,
      screenHeight: screenHeight
    })
  },
  // 滾動事件 
  onPageScroll(e) { 
    //滾動距離+屏幕高度換算vw倍數
    let listIndex = (e.scrollTop + this.data.screenHeight) / (this.data.screenWidth * 0.63)
    this.setData({
      listIndex: listIndex
    })
  }

此文轉載，原作者博客：https://blog.csdn.net/perfly_z/article/details/86611461