产生这个报错的原因是我当时将样式写到了less文件，我在div中使用的使用应该是使用className = ，而我误写了一个style = 。style里面当然没有自定义的className，所以产生报错，举个例子，你的className叫mycontent，自然style里面不会有的。所以报错，遇到此报错细心查找一下即可。
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