產生這個報錯的原因是我當時將樣式寫到了less文件，我在div中使用的使用應該是使用className = ，而我誤寫了一個style = 。style里面當然沒有自定義的className，所以產生報錯，舉個例子，你的className叫mycontent，自然style里面不會有的。所以報錯，遇到此報錯細心查找一下即可。
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