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纯javascript 平滑滚动到页面顶部html:<body id="top"><a href="#top" onclick="scrollToTop();return false">Back to Top ↑</a> javascript:var timeOut;function scrollToTop() { if (document.body.scrollTop!=0 || document....
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纯javascript 平滑滚动到页面顶部html:<body id="top"><a href="#top" onclick="scrollToTop();return false">Back to Top ↑</a> javascript:var timeOut;function scrollToTop() { if (document.body.scrollTop!=0 || document....
