css tab切换 Css如何实现tab选项卡切换

<style type="text/css">
.tabmenu{
position:absolute;
top:-28px;
left:144px;
margin:0px;
}
.tabmenu li{
display:inline-block;
}
.tabmenu li a{
display:block;
padding:5px 10px;
margin:0 10px 0 0;
border:1px solid #91a7b4;
border-radius:5px 5px 0 0;
background-color:#e3f1f8;
color:#333;
text-decoration: none;
font-size:16px;
}
.tablist{
position:relative;
top:200px;
margin:0 auto;
width:600px;
min-height:200px;
}
.tab_content{
position:absolute;
width:600px;
height:170px;
padding:15px;
border:1px solid #91a7b4;
border-radius:10px;
box-shadow:0 2px 3px rgba(0,0,0,0,1);
font-size:16px;
line-height:16px;
color:#666;
background-color:#fff;
}
#tab1:target,#tab2:target,#tab3:target{
z-index:1;
}
</style>
<div class="tablist">
<ul class="tabmenu">
<li><a href="#tab1">tab1</a></li>
<li><a href="#tab2">tab2</a></li>
<li><a href="#tab3">tab3</a></li>
</ul>
<div id="tab1" class="tab_content">tab1</div>
<div id="tab2" class="tab_content">tab2</div>
<div id="tab3" class="tab_content">tab3</div>
</div>

#tab1:target,#tab2:target,#tab3:target{
z-index:1;
}