js实现楼层效果的简单实例

时间：2021-05-26

今天自己写个楼层效果，有一点烦躁，小地方犯错误。各位大神来修改不足啊！！！

<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>楼层切换</title><style>*{padding: 0;margin: 0;}li{list-style: none;}.main img{width: 850px;height: 700px;float: left;}.title{width: 850px;height: 50px;text-align: center;line-height: 50px;}.floor{position: fixed;top: 20px;right: 20px;display: none;}.floor ul li{width: 70px;height: 30px;text-align: center;line-height: 30px;cursor: hand;cursor: pointer}.liStyle{background-color: red;}.loading{background:url("image/loading.gif") no-repeat center center;}#back{cursor: hand;cursor: pointer;}</style></head><body><div class="main" id="main"><h3 class="title">图片欣赏</h3><img as="image/1.jpg"/><img as="image/2.jpg"/><img as="image/3.jpg"/><img as="image/4.jpg"/><img as="image/5.jpg"/><img as="image/6.jpg"/><img as="image/7.gif"/><img as="image/8.jpg"/><img as="image/9.jpg"/><img as="image/10.jpg"/></div><div class="floor" id="floor"><ul id="floorUl"><li>第一张</li><li>第二张</li><li>第三张</li><li>第四张</li><li>第五张</li><li>第六张</li><li>第七张</li><li>第八张</li><li>第九张</li><li>第十张</li></ul><p id="back">返回顶部</p></div><script> var main = document.getElementById("main"); var floor = document.getElementById("floor"); var image = main.getElementsByTagName("img"); var floorUl = document.getElementById("floorUl"); var li = floorUl.getElementsByTagName("li"); var back = document.getElementById("back"); window.onload = window.onscroll = function(){ var scrollTop = document.documentElement.scrollTop || document.body.scrollTop; var height = document.documentElement.clientHeight || document.body.clientHeight; for(var i = 0;i < image.length; i++){ image[i].className = "loading"; if(delay(image[i]).top < scrollTop + height){ image[i].src = image[i].getAttribute("as"); } } if(scrollTop >= image[0].offsetTop){ floor.style.display = "block"; }else { floor.style.display = "none"; } var num = 0; for(var i = 0; i < image.length;i++){ if(scrollTop >= image[i].offsetTop){ num = i; } li[i].className = ""; } li[num].className = "liStyle"; for(var i = 0;i < li.length;i++){ li[i].onclick = function(){ for(var j = 0;j < li.length;j++){ if(this == li[j]){ document.documentElement.scrollTop = image[j].offsetTop; document.body.scrollTop = image[j].offsetTop; } } } } } var time = null; back.onclick = function() {function goBack(){ var ss = document.documentElement.scrollTop || document.body.scrollTop; ss-=50; document.documentElement.scrollTop = ss; document.body.scrollTop = ss; if(ss<= 0){ clearInterval(time); } } time = setInterval(goBack,1); } function delay(obj){ var l = 0; var t = 0; while (obj){ l = l + obj.offsetLeft; t = t + obj.offsetTop; obj = obj.offsetParent; } return{left:l,top:t}; }</script></body></html>

以上这篇js实现楼层效果的简单实例就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。

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