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react为何页面一载入获取Dom宽度为0?

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react为何页面一载入获取Dom宽度为0?

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如图,为了说明问题,我把无关的代码都删了,
留下的代码中,我发现页面一载入获取的元素宽度为0,这可怎么办呢?应该不是0,因为如果加了setTimeout,就可以正确获取宽度,但是要把代码都写在setTimeout里,肯定不美观,大神们有什么解决办法呢?谢谢
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