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: {
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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/i1/TB1DX3hIpXXXXXIaXXXSutbFXXX.jpg_240x240xz.jpg",
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{
src: "https://gtd.alicdn.com/sns_logo/i6/TB1SIYrLXXXXXaAXpXXSutbFXXX.jpg_240x240xz.jpg",
},
{
src: "https://gtd.alicdn.com/sns_logo/i1/TB11yxeNVXXXXbwXFXXSutbFXXX.jpg_240x240xz.jpg",
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{
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{
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src: "https://gtd.alicdn.com/sns_logo/i8/TB1RVS_QpXXXXXBXXXXSutbFXXX.jpg_240x240xz.jpg",
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src: "https://gtd.alicdn.com/sns_logo/i5/TB1aMNyLpXXXXa2XXXXSutbFXXX.jpg_240x240xz.jpg",
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src: "https://gtd.alicdn.com/sns_logo/i8/TB1JRHEQpXXXXXwXVXXSutbFXXX.jpg_240x240xz.jpg",
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src: "https://gtd.alicdn.com/sns_logo/i1/TB1pxCTQpXXXXa2apXXSutbFXXX.jpg_240x240xz.jpg",
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{
src: "https://gtd.alicdn.com/sns_logo/i1/TB1DX3hIpXXXXXIaXXXSutbFXXX.jpg_240x240xz.jpg",
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{
src: "https://gtd.alicdn.com/sns_logo/i6/TB1SIYrLXXXXXaAXpXXSutbFXXX.jpg_240x240xz.jpg",
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src: "https://gtd.alicdn.com/sns_logo/i1/TB11yxeNVXXXXbwXFXXSutbFXXX.jpg_240x240xz.jpg",
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src: "https://gtd.alicdn.com/sns_logo/i5/TB1aMNyLpXXXXa2XXXXSutbFXXX.jpg_240x240xz.jpg",
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src: "https://gtd.alicdn.com/sns_logo/i2/TB17gJ3OXXXXXcrXpXXSutbFXXX.jpg_240x240xz.jpg",
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{
src: "https://gtd.alicdn.com/sns_logo/i8/TB1um5GQpXXXXbiaXXXSutbFXXX.jpg_240x240xz.jpg",
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src: "https://gtd.alicdn.com/sns_logo/i1/TB1pxCTQpXXXXa2apXXSutbFXXX.jpg_240x240xz.jpg",
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{
src: "https://gtd.alicdn.com/sns_logo/i4/TB1nbrcOXXXXXXEXpXXSutbFXXX.jpg_240x240xz.jpg",
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{
src: "https://gtd.alicdn.com/sns_logo/i4/TB1CI_NQpXXXXXaXVXXSutbFXXX.jpg_240x240xz.jpg",
},
{
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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{
src: "https://gtd.alicdn.com/sns_logo/i1/TB17LgBNFXXXXaSXVXXSutbFXXX.jpg_240x240xz.jpg",
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{
src: "https://gtd.alicdn.com/sns_logo/i6/TB1fVJJQFXXXXcyXpXXSutbFXXX.jpg_240x240xz.jpg",
}
]
},
onLoad: function() {
/**
* this - 当前对象
* this.data.lazyData - 数据源
* 加载图标 - https://img.alicdn.com/tps/i3/T1QYOyXqRaXXaY1rfd-32-32.gif
*/
lazyImg(this, this.data.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,loading_icon)
*/
const lazyImg = (_that, data, loading_icon) => {
for (let i = 0, len = data.length; i < len; i++) {
wx.createIntersectionObserver().relativeToViewport({
bottom: 5
}).observe('.item-' + i, (ret) => {
ret.intersectionRatio > 0 ? data[i].show = true : '';
_that.setData({
lazyData: data,
loadIcon: loading_icon
})
})
}
}
微信官方API:wx.createIntersectionObserver ,感兴趣的可以去看看