Element (center) is obsolete. Its use is discouraged in HTML5 documents
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在写HTML和JS页面的时候会出现元素过时的提示，并且代码也没有提示：
解决方式：
写上这一句代码在最上边;
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">如图：
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