无依赖图片懒加载
图片懒加载
使用方法：
<img class="lazy" data-original="img/bmw_m1_hood.jpg" width="765" height="574">
注意：data-original为你的图片真实路径，class为lazy,需要固定宽高;js: 1.在页面中引入
<script type="text/javascript" src="lazyload.js"></script>2.调用
<script>new lazyLoad({/*可以传入一个对象覆盖默认选项，选项见下方*/})</script>可以自定义选项在实例化时传入:
1.threshold:需要提前多少阈值加载图片,默认为0
2.placeholder:自定义loading,默认为一张灰色背景
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