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为什么要点击两次才能出现效果呢

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为什么要点击两次才能出现效果呢

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第一次点击box的时候，才给menubox添加了点击事件。这种方法是不推荐的，有可能有内存泄露风险。

最好把menu代码都提出去，这样就能一次触发menubox的事件了


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