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Uncaught TypeError: Cannot read property 'tagName' of null

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喂你吃毓婷

#1 Created at ... [Delete] [Delete and Lock User]

原封不动的把代码copy到webstorm中运行，报错如下：Uncaught TypeError: Cannot read property 'tagName' of null

我想知道是我一个人吗？

菜帅帅帅

#2 Created at ... [Delete] [Delete and Lock User]

不是tagName，是TagName

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