微信小程序实现瀑布流布局：CSS与JS方案对比及代码详解

<!--pages/test/test.wxml-->
<view class="container">
 <view id="left">
  <view wx:for="{{leftList}}" wx:key>
   <image src="{{item.url}}" mode='widthFix'></image>
   <text>{{item.title}}</text>
  </view>
 </view>
 <view id="right">
  <view wx:for="{{rightList}}" wx:key>
   <image src="{{item.url}}" mode='widthFix'></image>
   <text>{{item.title}}</text>
  </view>
 </view>
</view>

/* pages/test/test.wxss */
#left, #right{
 width: 48%;
 margin: 0 1%;
 float: left;
}
#left image, #right image{
 width: 100%;
}

//test.js
let leftHeight = 0, rightHeight = 0; //分别定义左右两边的高度
let query;
Page({
 data: {
  list: [{
    title: '1',
    url: 'http://zq.jhcms.cn/attachs/photo/201711/20171130_176CFE51B6710715B1BBBEF2F86ACB0C.jpg',
   }, {
    title: '2',
    url: 'http://img3.imgtn.bdimg.com/it/u=1417732605,3777474040&fm=26&gp=0.jpg',
   },{
    title: '3',
    url: 'http://f10.baidu.com/it/u=121654667,1482133440&fm=72',
   },{
    title: '4',
    url: 'http://img3.imgtn.bdimg.com/it/u=1417732605,3777474040&fm=26&gp=0.jpg',
   },{
    title: '5',
    url: 'http://zq.jhcms.cn/attachs/photo/201711/20171130_9E39DA252E3946BE36218D85876C4AB4.jpg',
   },{
    title: '6',
    url: 'http://img3.imgtn.bdimg.com/it/u=1417732605,3777474040&fm=26&gp=0.jpg',
   },{
    title: '7',
    url: 'http://img3.imgtn.bdimg.com/it/u=1417732605,3777474040&fm=26&gp=0.jpg'
   },{
    title: '8',
    url: 'http://img3.imgtn.bdimg.com/it/u=1417732605,3777474040&fm=26&gp=0.jpg',
   },{
    title: '9',
    url: 'http://f10.baidu.com/it/u=121654667,1482133440&fm=72'
   },{
    title: '7',
    url: 'http://img4.imgtn.bdimg.com/it/u=2748975304,2710656664&fm=26&gp=0.jpg'
   },{
    title: '8',
    url: 'http://img2.imgtn.bdimg.com/it/u=1561660534,130168102&fm=26&gp=0.jpg'
   },{
    title: '9',
    url: 'http://img3.imgtn.bdimg.com/it/u=1417732605,3777474040&fm=26&gp=0.jpg'
   },{
    title: '10',
    url: 'http://zq.jhcms.cn/attachs/photo/201711/20171130_176CFE51B6710715B1BBBEF2F86ACB0C.jpg',
   }],
  leftList: [],
  rightList: []
 },
 onLoad() {
  this.isLeft();
 },
 async isLeft() {
  const { list, leftList, rightList } = this.data;
  query = wx.createSelectorQuery();
  for (const item of list) {
   leftHeight <= rightHeight ? leftList.push(item) : rightList.push(item); //判断两边高度，来觉得添加到那边
   await this.getBoxHeight(leftList, rightList);
  }
 },
 getBoxHeight(leftList, rightList) { //获取左右两边高度
  return new Promise((resolve, reject) => {
   this.setData({ leftList, rightList }, () => {
    query.select('#left').boundingClientRect();
    query.select('#right').boundingClientRect();
    query.exec((res) => {
     leftHeight = res[0].height; //获取左边列表的高度
     rightHeight = res[1].height; //获取右边列表的高度
     resolve();
    });
   });
  })
 }
})