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分类 : python

op = () => { let scrollTop = document.documentElement.scrollTop || document.body.scrollTop, delay = 10, time = 200; if (scrollTop <= 20) { document.documentElement.scrollTop = 0; document.body.scrollTop = 0; return; } let step = Math.ceil(scrollTop * delay / time); let timer = setInterval(() => { scrollTop = document.documentElement.scrollTop || document.body.scrollTop; if (scrollTop - step <= 0) { document.documentElement.scrollTop = 0; document.body.scrollTop = 0; clearInterval(timer); } else { document.documentElement.scrollTop = scrollTop - step; document.body.scrollTop = scrollTop - step; } }, delay); } document.addEventListener("scroll", handleScoll(), false); document.querySelector(".back-to-top").addEventListener("click", backToTop, false);