js实现tab选项卡切换功能
话不多说，请看代码：
<!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>
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