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lazyload-io

v0.0.2

Published

懒加载组件,图片懒加载

Downloads

3

Readme

Description(描述)

实现图片懒加载的组件,
手Q等浏览器使用老版本兼容,
其它平台使用新版本

Design(实现原理)

实现曝光逻辑

老版本

检测节点的getBoundingClientRect()返回值判断位置

新版本

使用IntersectionObserver
https://github.com/WICG/IntersectionObserver/tree/gh-pages/polyfill 用来适配低版本浏览器

自动绑定load

使用MutationObserver,
对于不支持MutationObserver的浏览器采用DOMNodeInserted事件替代

Usage(用法)

    npm install lazyload-io

引入

    import lazyLoad from "lazyload-io";

图片src里的地址放到data-src里,如

    <img src="" data-src="https://www.flypie.cn/images/avatar.jpg" />

如果需要手动刷新lazy缓存,需要手动调用(仅限老版本,新版本无此问题)

    lazyLoad.refreshLazyload();

在某些情况下 如果lazyload没有初始化完成或者没有事件响应,重新渲染(仅限老版本,新版本无此问题)

    lazyLoad.currentLazy();

兼容性

PC:

IE8以上

Chrome 48+

Firefox 49+

Opera 42+

Opera Mini 不支持

mobile:

Android 4.3以上 , Safari 9以上

QQ,UC,微信 新版本均支持,老版本尚未测试

Demo(Path)

js

    import lazyLoad from "@mfelibs/base-tools-lazyload";

html

    <img src="" data-src="https://www.flypie.cn/images/avatar.jpg" />

Screenshots(快照)

Properties(对外属性):

类型:(Array,Number,String,Boolean,(asc,desc))

| 属性名称 | 类型 | 默认值 |get|set | :-------------- | :------------ |:------------ |:------------ |:------------ | | 测试属性 | String | '' | √ | √ |

Methods(对外方法)

| 方法名称 | 类型 | 描述 |返回值 | :-------------- | :------------ |:------------ |:------------ | | currentLazy(仅限老版本) | 无 | pageload的时候触发,在某些情况下 如果lazyload没有初始化完成或者没有事件响应 | 无 | | refreshLazyload(仅限老版本) | 无 | 重新刷新lazyload初始化,用在动态添加元素之后。如果被添加元素中包含有lz的需要手动重新初始化lz | 无 |

Events(对外事件)

| 事件名称 | 参数 | 描述 |返回值 | :-------------- | :------------ |:------------ |:------------ | | TestEvent | 测试参数 | 测试描述 | 无 | | TestEvent | 测试参数 | 测试描述 | 无 |