CSS实现Tab布局的简单实例(必看)

<div class="container">
   <div class="tab-content">
     <div id="item1" class="item">内容1</div>
     <div id="item2" class="item">内容2</div>
     <div id="item3" class="item">内容3</div>
     <div id="item4" class="item">内容4</div>
   </div>
   <div class="tab-control">
     <ul>
        <li><a href="#item1">内容1</a></li>
        <li><a href="#item2">内容2</a></li>
        <li><a href="#item3">内容3</a></li>
        <li><a href="#item4">内容4</a></li>
     </ul>
   </div>
</div>

ul,li{
  margin:0;
  padding:0;
  list-style:none;
}
.container{
  width:400px;
  height:300px;
  background-color:silver;
}
.tab-content{
  width:100%;
  height:80%;
  overflow:hidden;
}
.tab-content .item{
  width:100%;
  height:100%;
}
.tab-control{
  width:100%;
  height:20%;
}
.tab-control ul{
  height:100%;
}
.tab-control li{
  width:25%;
  height:100%;
  float:left;
  border:1px solid silver;
  box-sizing:border-box;
  background-color:white;
  cursor: pointer;
}
.tab-control li:hover{
  background-color:#7b7474
}
.tab-control a{
  display:inline-block;
  width:100%;
  height:100%;
  line-height:100%;
  text-align:center;
  text-decoration: none;
}
.tab-control a::after{
  content:"";
  display:inline-block;
  height:100%;
  vertical-align:middle;
}
.tab-content .item:target{
  background:yellow;
}

<div class="container">
   <ul>
     <li class="item active">
       <p class="title">1</p>
       <p class="content">1</p>
     </li>
     <li class="item">
       <p class="title">2</p>
       <p class="content ml1">2</p>
     </li>
     <li class="item">
       <p class="title">3</p>
       <p class="content ml2">3</p>
     </li>
     <li class="item">
       <p class="title">4</p>
       <p class="content ml3">4</p>
     </li>
   </ul>
</div>

ul,li,p{
  margin:0;
  padding:0;
  list-style:none;
}
.container{
  width:400px;
  height:300px;
  background-color:silver;
  border:1px solid silver;
}
.container ul{
  width:100%;
  height:100%;
  overflow:hidden;
}
.container .item{
  float:left;
  width:25%;
  height:100%;
  background-color:white;
}
.container .item .title{
  line-height:40px;
  border:1px solid silver;
  box-sizing:border-box;
  text-align:center;
  cursor:pointer;
}
.container .item .content{
  width:400%;
  height:100%;
  background-color:yellow;
}
.ml1{
  margin-left:-100%;
}
.ml2{
  margin-left:-200%;
}
.ml3{
  margin-left:-300%;
}
.active{
  position:relative;
  z-index:1
}
.container .item:hover{
  position:relative;
  z-index:1
}
.container .item:hover .title{
  border-bottom:none;
  background-color:yellow;
}

<div class="container">
   <div class="tab-content">
     <div id="item1" class="item">内容1</div>
     <div id="item2" class="item">内容2</div>
     <div id="item3" class="item">内容3</div>
     <div id="item4" class="item">内容4</div>
   </div>
   <div class="tab-control">
     <ul>
        <li><a href="#item1">内容1</a></li>
        <li><a href="#item2">内容2</a></li>
        <li><a href="#item3">内容3</a></li>
        <li><a href="#item4">内容4</a></li>
     </ul>
   </div>
</div>