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
- 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: "https://gtd.alicdn.com/sns_logo/i4/TB1MwqbLpXXXXaEXpXXSutbFXXX.jpg_240x240xz.jpg",
- },
- {
- src: "https://gtd.alicdn.com/sns_logo/i8/TB1RVS_QpXXXXXBXXXXSutbFXXX.jpg_240x240xz.jpg",
- },
- {
- src: "https://gtd.alicdn.com/sns_logo/i5/TB1xEJiLXXXXXcxaXXXSutbFXXX.jpg_240x240xz.jpg",
- },
- {
- src: "https://gtd.alicdn.com/sns_logo/i6/TB1DSuHJVXXXXXmXXXXwu0bFXXX.png_240x240xz.jpg",
- },
- {
- src: "https://gtd.alicdn.com/sns_logo/i5/TB1aMNyLpXXXXa2XXXXSutbFXXX.jpg_240x240xz.jpg",
- },
- {
- src: "https://gtd.alicdn.com/sns_logo/i8/TB1JRHEQpXXXXXwXVXXSutbFXXX.jpg_240x240xz.jpg",
- },
- {
- src: "https://gtd.alicdn.com/sns_logo/i7/TB1qKEuQpXXXXXYXXXXSutbFXXX.jpg_240x240xz.jpg",
- },
- {
- src: "https://gtd.alicdn.com/sns_logo/i7/TB1TlOfQFXXXXX2XXXXwu0bFXXX.png_240x240xz.jpg",
- },
- {
- src: "https://gtd.alicdn.com/sns_logo/i1/TB1SKu.QpXXXXbDXVXXSutbFXXX.jpg_240x240xz.jpg",
- },
- {
- src: "https://gtd.alicdn.com/sns_logo/i2/TB17gJ3OXXXXXcrXpXXSutbFXXX.jpg_240x240xz.jpg",
- },
- {
- src: "https://gtd.alicdn.com/sns_logo/i8/TB1um5GQpXXXXbiaXXXSutbFXXX.jpg_240x240xz.jpg",
- },
- {
- src: "https://gtd.alicdn.com/sns_logo/i1/TB1pxCTQpXXXXa2apXXSutbFXXX.jpg_240x240xz.jpg",
- },
- {
- src: "https://gtd.alicdn.com/sns_logo/i6/TB1zksMNVXXXXaRapXXSutbFXXX.jpg_240x240xz.jpg",
- },
- {
- src: "https://gtd.alicdn.com/sns_logo/i4/TB1nbrcOXXXXXXEXpXXSutbFXXX.jpg_240x240xz.jpg",
- },
- {
- 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",
- },
- {
- src: "https://gtd.alicdn.com/sns_logo/i7/TB1doDVQpXXXXcRaXXXSutbFXXX.jpg_240x240xz.jpg",
- },
- {
- src: "https://gtd.alicdn.com/sns_logo/i1/TB17LgBNFXXXXaSXVXXSutbFXXX.jpg_240x240xz.jpg",
- },
- {
- src: "https://gtd.alicdn.com/sns_logo/i6/TB1fVJJQFXXXXcyXpXXSutbFXXX.jpg_240x240xz.jpg",
- },
- {
- src: "https://gtd.alicdn.com/sns_logo/i3/TB1wnBTKFXXXXcQXXXXSutbFXXX.jpg_240x240xz.jpg",
- },
- {
- 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: "https://gtd.alicdn.com/sns_logo/i4/TB1MwqbLpXXXXaEXpXXSutbFXXX.jpg_240x240xz.jpg",
- },
- {
- src: "https://gtd.alicdn.com/sns_logo/i8/TB1RVS_QpXXXXXBXXXXSutbFXXX.jpg_240x240xz.jpg",
- },
- {
- src: "https://gtd.alicdn.com/sns_logo/i5/TB1xEJiLXXXXXcxaXXXSutbFXXX.jpg_240x240xz.jpg",
- },
- {
- src: "https://gtd.alicdn.com/sns_logo/i6/TB1DSuHJVXXXXXmXXXXwu0bFXXX.png_240x240xz.jpg",
- },
- {
- src: "https://gtd.alicdn.com/sns_logo/i5/TB1aMNyLpXXXXa2XXXXSutbFXXX.jpg_240x240xz.jpg",
- },
- {
- src: "https://gtd.alicdn.com/sns_logo/i8/TB1JRHEQpXXXXXwXVXXSutbFXXX.jpg_240x240xz.jpg",
- },
- {
- src: "https://gtd.alicdn.com/sns_logo/i7/TB1qKEuQpXXXXXYXXXXSutbFXXX.jpg_240x240xz.jpg",
- },
- {
- src: "https://gtd.alicdn.com/sns_logo/i7/TB1TlOfQFXXXXX2XXXXwu0bFXXX.png_240x240xz.jpg",
- },
- {
- src: "https://gtd.alicdn.com/sns_logo/i1/TB1SKu.QpXXXXbDXVXXSutbFXXX.jpg_240x240xz.jpg",
- },
- {
- src: "https://gtd.alicdn.com/sns_logo/i2/TB17gJ3OXXXXXcrXpXXSutbFXXX.jpg_240x240xz.jpg",
- },
- {
- src: "https://gtd.alicdn.com/sns_logo/i8/TB1um5GQpXXXXbiaXXXSutbFXXX.jpg_240x240xz.jpg",
- },
- {
- src: "https://gtd.alicdn.com/sns_logo/i1/TB1pxCTQpXXXXa2apXXSutbFXXX.jpg_240x240xz.jpg",
- },
- {
- src: "https://gtd.alicdn.com/sns_logo/i6/TB1zksMNVXXXXaRapXXSutbFXXX.jpg_240x240xz.jpg",
- },
- {
- src: "https://gtd.alicdn.com/sns_logo/i4/TB1nbrcOXXXXXXEXpXXSutbFXXX.jpg_240x240xz.jpg",
- },
- {
- 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",
- },
- {
- src: "https://gtd.alicdn.com/sns_logo/i7/TB1doDVQpXXXXcRaXXXSutbFXXX.jpg_240x240xz.jpg",
- },
- {
- src: "https://gtd.alicdn.com/sns_logo/i1/TB17LgBNFXXXXaSXVXXSutbFXXX.jpg_240x240xz.jpg",
- },
- {
- 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
- * 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
微信小程序 - 图片懒加载的更多相关文章
- 微信小程序之下拉加载和上拉刷新
微信小程序下拉加载和上拉刷新两种实现方法 方法一:onPullDownRefresh和onReachBottom方法实现小程序下拉加载和上拉刷新 首先要在json文件里设置window属性 ...
- 微信小程序下拉加载和上拉刷新两种实现方法
方法一:onPullDownRefresh和onReachBottom方法实现小程序下拉加载和上拉刷新 首先要在json文件里设置window属性 设置js里onPullDownRefresh和onR ...
- 微信小程序---》分包加载
[小程序]---分包加载 一.分包加载 某些情况下,开发者需要将小程序划分成不同的子包,在构建时打包成不同的分包,用户在使用时按需进行加载 在构建小程序分包项目时,构建会输出一个或多个分包.每个使 ...
- 微信小程序-工具无法加载本地模拟开发服务的解决办法
微信小程序开发工具出现如下问题: 因为网络代理软件或者 VPN 影响,工具无法加载本地模拟开发服务 请尝试以下任一解决方案1.关闭相关网络代理软件,重新编译成功后,再启动相关网络代理软件: 2.配置 ...
- 微信小程序上拉加载下拉刷新
微信小程序实现上拉加载下拉刷新 使用小程序默认提供方法. (1). 在xxx.json 中开启下拉刷新,需要设置backgroundColor,或者是backgroundTextStyle ,因为加载 ...
- 微信小程序下拉加载下一页
小程序做得多了,有些常用功能就有必要记录一下 请看详解: 微信小程序之下拉触底时加载下一页 wxml参考: <scroll-view class='dataContainer' scroll-y ...
- 微信小程序 - 上拉加载下拉刷新
点击下载示例:小程序 - 上拉刷新下拉加载
- 微信小程序之上拉加载更多
loadmore 加载更多(分页加载) 当用户打开一个页面时,假设后台数据量庞大时,一次性地返回所有数据给客户端,页面的打开速度就会有所下降,而且用户只看上面的内容而不需要看后面的内容时,也浪费用户流 ...
- 微信小程序上拉加载:onReachBottom详解+设置触发距离
前端经常遇到上拉加载更多的需求,一般还涉及到翻页.小程序里已经给了下拉到底的触发方法onReachBottom(),这里记录下怎样使用这个方法实现下拉加载更多,有需要的直接看代码,有详细注释: 1.首 ...
随机推荐
- 某个 页面覆盖了 UITabBar 的tabItem的解决办法
将这个页面的背景色设置为无色: [self.view setBackgroundColor:[UIColor clearColor]]; 或者 self.view.frame = CGRectMake ...
- 解决Oracle EM 乱码问题
原创 作者:fa042 时间:2012-11-17 16:50:34 199 0 Oracle 10g提供了一个基于Web的管理工具EM(Enterprise Manager),使用比较方便.不过,如 ...
- Git每次进入都需要输入用户名和密码的问题解决
解决方法: 在项目目录下输入以下命令: git config --global credential.helper store 使用git pull 的时候回提示再输下用户名和密码就行了.
- Node.js + Express 构建的订餐系统
Node.js的版本 - v0.8.12 Express的版本 – v3.3.3 (安装 $ npm install -g express) 系统的登录逻辑是:获取用户名 + 密码,向内网RTX服务 ...
- [Android Security] jar文件转smali文件
cp : https://blog.csdn.net/fengmm521/article/details/78446486 jar转smali文件一共要走两步,先将jar文件转为.dex文件 (dx工 ...
- 使用kubectl创建部署
本文使用自己利用VirtubalBox搭建的集群环境,暂时只有一个Master.一个Node.如果想了解集群的搭建,可以参考我的文章离线环境安装Kubernetes集群以及使用kubeadm安装kub ...
- 单元测试利器 JUnit 4
引言 毋庸置疑,程序员要对自己编写的代码负责,您不仅要保证它能通过编译,正常地运行,而且要满足需求和设计预期的效果.单元测试正是验证代码行为是否满足预期的有效手段之一.但不可否认,做测试是件很枯燥无趣 ...
- android studio运行时报错AVD Nexus_5X_API_P is already running解决办法
运行刚搭建好的Android环境时会报这种错误: AVD Nexus_5X_API_P is already running. If that is not the case, delete the ...
- Guava CaseFormat
概述 CaseFormat用来转换各种不同的编程语言间的变量名命名格式, 主要用到的方法只有一个 CaseFormat.to(CaseFormat from, String s) CaseFormat ...
- 洛谷 P1347 排序
题目描述 一个不同的值的升序排序数列指的是一个从左到右元素依次增大的序列,例如,一个有序的数列A,B,C,D 表示A<B,B<C,C<D.在这道题中,我们将给你一系列形如A<B ...