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useEffect很常用,主要是做页面加载的初始化的一些动作。
比如,我们想网页加载完成之后,就自动进行网络的获取,而不用再通过按钮的点击触发这个请求。
这里可以尝试实现一下挑战5,在网页加载完成之后,每隔一秒这个数字就跳动自动+1
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