CSS实现Tab布局的简单实例(必看)

<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">
    <input type="radio" name="item" class="radio-item" id="item1" checked/>
    <div class="item">内容1</div>
    <input type="radio" name="item" class="radio-item" id="item2" />
    <div class="item">内容2</div>
    <input type="radio" name="item" class="radio-item" id="item3" />
    <div class="item">内容3</div>
    <input type="radio" name="item" class="radio-item" id="item4" />
    <div class="item">内容4</div>
  </div>
  <div class="tab-control">
    <ul>
      <li><label for="item1">内容1</label></li>
      <li><label for="item2">内容2</label></li>
      <li><label for="item3">内容3</label></li>
      <li><label for="item4">内容4</label></li>
    </ul>
  </div>
</div>

ul,
li {
  margin: 0;
  padding: 0;
  list-style: none;
}

.container {
  width: 400px;
  height: 300px;
  background-color: silver;
}

.tab-content {
  position: relative;
  width: 100%;
  height: 80%;
  overflow: hidden;
}

input {
  margin: 0;
  width: 0;
}

.tab-content .item {
  position: absolute;
  left: 0;
  top: 0;
  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;
}

.tab-control li:hover {
  background-color: #7b7474
}

.tab-control label {
  display: inline-block;
  width: 100%;
  height: 100%;
  line-height: 100%;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
}

.tab-control label::after {
  content: "";
  display: inline-block;
  height: 100%;
  vertical-align: middle;
}
.tab-content .radio-item{
  display:none;
}
.tab-content .radio-item:checked+.item {
  z-index: 1;
  background-color: yellow;
}

<div class="container">
   <ul>
     <li class="item active">
       <input type="radio" name="item" class="radio-item" id="item1" checked/>
       <label class="title" for="item1">1</label>
       <p class="content">1</p>
     </li>
     <li class="item">
       <input type="radio" name="item" class="radio-item" id="item2" />
       <label class="title" for="item2">2</label>
       <p class="content ml1">2</p>
     </li>
     <li class="item">
       <input type="radio" name="item" class="radio-item" id="item3" />
       <label class="title" for="item3">3</label>
       <p class="content ml2">3</p>
     </li>
     <li class="item">
       <input type="radio" name="item" class="radio-item" id="item4" />
       <label class="title" for="item4">4</label>
       <p class="content ml3">4</p>
     </li>
   </ul>
</div>