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>
js
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data: {
lazyData: [{
src: "https://gtd.alicdn.com/sns_logo/i1/TB124_3NXXXXXasXVXXSutbFXXX.jpg_240x240xz.jpg",
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{
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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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