微信小程序 - 图片懒加载

wxml

<!-- 数据源 -->

<view class='item-{{index}}' wx:for="{{lazyData}}" wx:key="*this.src">

  <image src='{{item.show? item.src : loadIcon}}' class='{{item.show? "active" : ""}}'></image>

  <view>a-{{index}}</view>

</view>

Page({

  data: {

    lazyData: [{

        src: "https://gtd.alicdn.com/sns_logo/i1/TB124_3NXXXXXasXVXXSutbFXXX.jpg_240x240xz.jpg",

      },

      {

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      },

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        src: "https://gtd.alicdn.com/sns_logo/i1/TB1_f_PLXXXXXbVXpXXSutbFXXX.jpg_240x240xz.jpg",

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        src: "https://gtd.alicdn.com/sns_logo/i8/TB1um5GQpXXXXbiaXXXSutbFXXX.jpg_240x240xz.jpg",

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      },

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        src: "https://gtd.alicdn.com/sns_logo/i1/TB124_3NXXXXXasXVXXSutbFXXX.jpg_240x240xz.jpg",

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        src: "https://gtd.alicdn.com/sns_logo/i2/TB18vTdQFXXXXXlXpXXwu0bFXXX.png_240x240xz.jpg",

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        src: "https://gtd.alicdn.com/sns_logo/i7/TB1doDVQpXXXXcRaXXXSutbFXXX.jpg_240x240xz.jpg",

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      }

    ]

  },

  onLoad: function() {

    /**

     * this - 当前对象

     * this.data.lazyData - 数据源

     * lazy_name - 数据名

     * 加载图标 - https://img.alicdn.com/tps/i3/T1QYOyXqRaXXaY1rfd-32-32.gif

     */

    lazyImg(this, this.data.lazyData, 'lazyData', 'https://img.alicdn.com/tps/i3/T1QYOyXqRaXXaY1rfd-32-32.gif')

  }

})

/**

 * 数据名必须为:lazyData或其它名(与数据以及页面相同)

 *

 * 模拟数据：lazyData

 * 传输数据：_that,data(this,lazyData,lazy_name,loading_icon)

 */

const lazyImg = (_that, data, lazy_name, loading_icon) => {

  for (let i = 0, len = data.length; i < len; i++) {

    wx.createIntersectionObserver().relativeToViewport({

      bottom: 20

    }).observe('.item-' + i, (ret) => {

      ret.intersectionRatio > 0 ? data[i].show = true : '';

      _that.setData({

        [lazy_name]: data,

        loadIcon: loading_icon

      })

    })

  }

}

微信官方API：wx.createIntersectionObserver ，感兴趣的可以去看看

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