今天碰到这么一个问题，在使用sweetalert的时候时有时无会报错
elem.className.replace Uncaught TypeError: Cannot read property 'className' of null
很简单，debug源码，发现elem在有时候会为空，为空的时候抛出异常，修改如下代码即可解决该问题
效果：
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