使用jq实现tab切换，效果如下
完整代码如下：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>tab切换</title>
<style type="text/css">
#box{
height: 400px;
width: 600px;
border: 1px solid #ccc;
padding: 10px;
}
ul{
height: 30px;
width: 600px;
padding: 0;
margin: 0;
}
li{
display: block;
text-align: center;
width: 100px;
float: left;
list-style: none;
cursor: pointer;
height: 30px;
line-height: 30px;
}
.choice{
background: #409EFF;
color: #fff;
}
.tab-item{
display: none;
}
.show{
display: block;
}
</style>
</head>
<body>
<ul>
<li tabid="1" class="choice">tab1</li>
<li tabid="2">tab2</li>
<li tabid="3">tab3</li>
</ul>
<div id="box">
<div class="tab-item show">Tab-item1</div>
<div class="tab-item">Tab-item2</div>
<div class="tab-item">Tab-item3</div>
</div>
<script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.min.js"></script>
<script type="text/javascript">
$("li").click(function(){
// 修改tab标签样式
$(this).attr("class","choice")
$(this).siblings().attr("class","")
// 获取tab ID
var itemId = $(this).attr("tabid")-1;
// 切换到指定tab
$("#box").find("div:eq("+itemId+")").attr("class","show")
$("#box").find("div:eq("+itemId+")").siblings().attr("class","tab-item")
})
</script>
</body>
</html>
