javaScript实现滚动条事件详解

时间：2021-05-26

本文实例为大家分享了js实现滚动条事件的具体代码，供大家参考，具体内容如下

代码：

<html> <head> <meta charset="utf-8"> <meta name="viewport" content="initial-scale=1.0, maximum-scale=1.0, user-scalable=no" /> <title></title> <style> body { margin: 0; padding: 0; } .cont { height: 7000px; } #top { position: fixed; width: 100%; height: 55px; top: 0px; left: 0px; background-color: rosybrown; display: none; } #left { position: fixed; width: 50px; height: 400px; top: 150px; left: 50px; background-color: cadetblue; display: none; } #left ul { list-style: none; padding-left: 0px; } #left ul li { border: 1px solid white; height: 30px; line-height: 30px; text-align: center; margin: 15px auto; } .a { background-color: burlywood; color: #FFFFFF; } </style> <script> //滚动事件 function myScroll() { var i = document.body.scrollTop; var top = document.getElementById("top"); var left = document.getElementById("left"); var f1 = document.getElementById("f1"); var f2 = document.getElementById("f2"); var f3 = document.getElementById("f3"); var f4 = document.getElementById("f4"); var f5 = document.getElementById("f5"); var f6 = document.getElementById("f6"); //控制顶部 if(i >= 1000) { top.style.display = "block"; top.innerHTML = i; } else { top.style.display = "none"; } //控制左侧 if(i >= 2000) { left.style.display = "block"; } else { left.style.display = "none"; } //显示楼层 if(i >= 2000 && i <= 2500) { f1.className = "a"; f2.className = ""; f3.className = ""; f4.className = ""; f5.className = ""; f6.className = ""; } else if(i > 2500 && i <= 3000) { f1.className = ""; f2.className = "a"; f3.className = ""; f4.className = ""; f5.className = ""; f6.className = ""; } else if(i > 3000 && i <= 3500) { f1.className = ""; f2.className = ""; f3.className = "a"; f4.className = ""; f5.className = ""; f6.className = ""; } else if(i > 3500 && i <= 4000) { f1.className = ""; f2.className = ""; f3.className = ""; f4.className = "a"; f5.className = ""; f6.className = ""; } else if(i > 4000 && i <= 4500) { f1.className = ""; f2.className = ""; f3.className = ""; f4.className = ""; f5.className = "a"; f6.className = ""; } else if(i > 4500 && i <= 5000) { f1.className = ""; f2.className = ""; f3.className = ""; f4.className = ""; f5.className = ""; f6.className = "a"; } } </script> </head> <body onscroll="myScroll()"> <div id="left"> <ul> <li id="f1">1F</li> <li id="f2">2F</li> <li id="f3">3F</li> <li id="f4">4F</li> <li id="f5">5F</li> <li id="f6">6F</li> </ul> </div> <div id="top"></div> <div class="cont"></div> </body></html>

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