<!DOCTYPE html><html lang="zh-CN"><head><meta charset="UTF-8"><title>JS小案例：右侧缓冲悬浮框</title><style>body {height: 2000px;margin: 0px;}#div1 {width: 100px;height: 150px;background: red;position: absolute;right: 0;bottom:calc(50% - 75px);}</style><script>window.onscroll = function () {startMove();}var timer = null;function startMove() {var oDiv = document.getElementById('div1');clearInterval(timer);timer = setInterval(function () {var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;var iTarget = (document.documentElement.clientHeight - oDiv.offsetHeight) / 2 + scrollTop;iTarget = Math.ceil(iTarget);var speed = (iTarget - oDiv.offsetTop) / 4;speed = speed > 0 ? Math.ceil(speed) : Math.floor(speed);if (oDiv.offsetTop == iTarget) {clearInterval(timer);} else {oDiv.style.top = oDiv.offsetTop + speed + 'px';}}, 30)}</script></head><body><div id='div1'></div></body></html>
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