一个轻巧的小程序 - Lazyload，100 行代码。加上一个data-src属性，能够让页面中的图片懒加载、textarea 中的脚本懒执行，有需要的可以拿过去用用，代码逻辑比较简单，也可以自己增强点功能，比如动态添加懒加载监听等等。

<script src="https://raw.githubusercontent.com/barretlee/lazyload/master/index.js"></script>    <div class="box">    <div class="item"><img src data-src="img-path"></div>    <div class="item"><textarea>alert(1)</textarea></div>  </div>

It exports an api to global:

new Lazyload('.box .item');

Params

There are two param your can set:

• Lazyload.TAG, default is 'data-src', we set the lazyload image 'src' to null, then read 'data-src' attribute. for example:

<img src data-src="THE-REAL-PATH" />

• Lazyload.DISTANCE, default is 0, if you want to show the lazyload element in advance, you can set it to a positive number;

项目主页：http://www.open-open.com/lib/view/home/1447741261759