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>
js
Page({ data: { lazyData: [{ src: "https://gtd.alicdn.com/sns_logo/i1/TB124_3NXXXXXasXVXXSutbFXXX.jpg_240x240xz.jpg", }, { src: "https://gtd.alicdn.com/sns_logo/i7/TB1IWtgQFXXXXcmXFXXSutbFXXX.jpg_240x240xz.jpg", }, { src: "https://gtd.alicdn.com/sns_logo/i1/TB1_f_PLXXXXXbVXpXXSutbFXXX.jpg_240x240xz.jpg", }, { src: "https://gtd.alicdn.com/sns_logo/i1/TB1DX3hIpXXXXXIaXXXSutbFXXX.jpg_240x240xz.jpg", }, { src: "https://gtd.alicdn.com/sns_logo/i6/TB1SIYrLXXXXXaAXpXXSutbFXXX.jpg_240x240xz.jpg", }, { src: "https://gtd.alicdn.com/sns_logo/i1/TB11yxeNVXXXXbwXFXXSutbFXXX.jpg_240x240xz.jpg", }, { src: "https://gtd.alicdn.com/sns_logo/i3/TB1ndJiQFXXXXctaXXXSutbFXXX.jpg_240x240xz.jpg", }, { src: "https://gtd.alicdn.com/sns_logo/i4/TB1BYGDLpXXXXbuXXXXSutbFXXX.jpg_240x240xz.jpg", }, { src: "https://gtd.alicdn.com/sns_logo/i2/TB1_9GoMVXXXXXmaXXXSutbFXXX.jpg_240x240xz.jpg", }, { src: "https://gtd.alicdn.com/sns_logo/i2/TB1cSZZNFXXXXaKaXXXSutbFXXX.jpg_240x240xz.jpg", }, { src: 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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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