原生js返回顶部

let backToTop = function() { let scrollToptimer = setInterval(function() { let top = document.body.scrollTop || document.documentElement.scrollTop; let speed = top / 4; if (document.body.scrollTop !== 0) { document.body.scrollTop -= speed; } else { document.documentElement.scrollTop -= speed; } if (top === 0) { clearInterval(scrollToptimer); } }, 40);};

  

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