話不多說，請看代碼：
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Document</title> <style> *{ margin:0; padding:0; list-style: none; box-sizing: border-box; } .menu{ position: relative; display: flex; height: 20px; justify-content:space-around; } .menu span{ display: block; width: 100%; height: 100%; text-align: center; } .menu .line{ position: absolute; bottom:0; left: 0; width: 33.33%; height: 1px; background: red; -webkit-transition: all .2s; transition: all .2s; } .main{ position: relative; width: 100%; } .main li{ position: absolute; top:0; left:0; } .hide{ display: none; } .show{ display: block; } </style></head><body> <div class="menu"> <span>menu1</span> <span>menu2</span> <span>menu3</span> <div class="line"></div> </div> <ul class="main"> <li>menu1</li> <li class="hide">menu2</li> <li class="hide">menu3</li> </ul><script> window.onload=function(){ var oMenu=document.querySelectorAll(".menu span"); var oMain=document.querySelectorAll(".main li"); var oLine=document.querySelector(".line"); for(var i=0;i<oMenu.length;i++){ oMenu[i].index=i; oMenu[i].onclick=function(){ var thisIndex=this.index; for(var j=0;j<oMain.length;j++){ oMain[j].style.display="none"; oMain[thisIndex].style.display="block"; } oLine.style.left=thisIndex*33.33+"%"; } } }</script></body></html>以上就是本文的全部內容，希望本文的內容對大家的學習或者工作能帶來一定的幫助，同時也希望多多支持武林網！
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