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# lazyload
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Lazyload Plugin for javaScript
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图片懒加载插件
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具备以下特性
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- 支持图片 change 前的回调事件
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- 支持设置图片加载时的临界值
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- 兼容性IE7+
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##Examples
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```html
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<script>
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 // 获取目标对象
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var imgArr = document.getElementsByTagName('img');
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var box = document.getElementById('box');
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// 实例化插件
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new Lazyload(imgArr,{
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container:box,
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apper:function(){
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// some code
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}
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   })
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</script>
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```
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##主要参数
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```js
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/**
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   * @param {number} threshold     临界值,选填,默认 0
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   * @param {string} event 事件类型,选填,默认 'scroll'
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   * @param {object} container 容器,选填,默认 window
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   * @param {string} 标记名称,选填,默认 'data-original'
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   * @param {function} apper 图片即将更换时的回调函数,选填,默认 null
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   * @param {string} placeholder 占位图片,选填,默认为一段图片的 base64值
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**/
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```
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##Notes
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- 注意插件接受的参数都为原生 javaScript 对象

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