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有没有DOM元素被滚到窗口中的事件？

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有没有DOM元素被滚到窗口中的事件？

比如我要对图片懒加载，有没有一个事件来表示img DOM在浏览器往下滚时，dom滚到用户当前窗口出现的事件？


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可以通过getBoundingClientRect来判断元素是否在窗口内，详情可参考
http://www.cnblogs.com/cococe...


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