my_loan/htmldev/wxMini/pages/home/home.js

let leftHeight = 0
let rightHeight = 0
let query = null
Page({

  /**
   * 页面的初始数据
   */
  data: {
    background: ['demo-text-1', 'demo-text-2', 'demo-text-3'],
    txtlist: [
      '这是第一条公告内容',
      '小程序上下滚动效果总结',
      '这是一行上下滚动的文字，文字最好短点，超过一行省略'
    ],
    headerNav: [{
      icon: '',
      name: '供应商',
      path: 'partner'
    },
      {
        icon: '',
        name: '采购指南',
        path: 'guide'
      },
      {
        icon: '',
        name: '收藏',
        path: 'collection'
      },
      {
        icon: '',
        name: '农事天地',
        path: 'news'
      }
    ],
    category: [
      {
        name: '全部',
        id: '1'
      },
      {
        name: '分类',
        id: '2'
      },
      {
        name: '分类',
        id: '3'
      },
      {
        name: '分类',
        id: '4'
      },
      {
        name: '分类',
        id: '5'
      },
      {
        name: '分类',
        id: '6'
      }
    ],
    currentCategory: '2',
    list: [],
    leftList: [],
    rightList: []
  },

  /**
   * 生命周期函数--监听页面加载
   */
  onLoad(options) {

  },

  /**
   * 生命周期函数--监听页面初次渲染完成
   */
  onReady() {

  },

  /**
   * 生命周期函数--监听页面显示
   */
  onShow() {

  },

  /**
   * 生命周期函数--监听页面隐藏
   */
  onHide() {

  },

  /**
   * 生命周期函数--监听页面卸载
   */
  onUnload() {

  },

  /**
   * 页面相关事件处理函数--监听用户下拉动作
   */
  onPullDownRefresh() {

  },

  /**
   * 页面上拉触底事件的处理函数
   */
  onReachBottom() {

  },

  /**
   * 用户点击右上角分享
   */
  onShareAppMessage() {

  },
  async isLeft() {
    const {
      list,
      leftList,
      rightList
    } = this.data
    query = wx.createSelectorQuery()
    for (const item of list) {
      leftHeight <= rightHeight ? leftList.push(item) : rightList.push(item)
      await this.getBoxHeight(leftList, rightList)
    }
  },
  getBoxHeight(leftList, rightList) {
    return new Promise((resolve, reject) => {
      this.setData({
        leftList,
        rightList
      }, () => {
        query.select('.waterfall-left').boundingClientRect()
        query.select('.waterfall-right').boundingClientRect()
        query.exec((res) => {
          leftHeight = res[0].height
          rightHeight = res[1].height
          resolve()
        })
      })
    })
  },
  jumpLeavingAMessage() {
    wx.navigateTo({
      url: '/pages/leavingAMessage/leavingAMessage'
    })
  },
  handleNav(e) {
    const { item } = e.currentTarget.dataset
    if (Object.prototype.toString.call(item) === '[object Object]' && item.path) {
      const path = item.path

      if (path === 'news' || path === 'partner') {
        wx.switchTab({
          url: `/pages/${path}/${path}`
        })
        return
      }
      wx.navigateTo({
        url: `/pages/${path}/${path}`
      })
    }
  },
  openMarketing(e) {
    const { page } = e.currentTarget.dataset

    wx.navigateTo({
      url: `/pages/${page}/${page}`
    })
  }
})