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Javascript

js-方法一（判断法）

<!DOCTYPE html>
 <html>
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 <style>
 *{
  padding: 0;
  margin: 0;
 }
 li{
  list-style: none;
 }
 </style>
 <script>
 function tab(pid){
  var tabs=["tab1","tab2","tab3","tab4"];
  for(var i=0;i<4;i++){
   if(tabs[i]==pid){
    document.getElementById(tabs[i]).style.display="block";
  }else{
    document.getElementById(tabs[i]).style.display="none";
  }
  }
 }
 </script>
</head>
 <body>
 <div id="tanContainer">
  <div id="tabNav">
  <ul>
   <li onclick="tab('tab1')">标题一</li>
   <li onclick="tab('tab2')">标题二</li>
   <li onclick="tab('tab3')">标题三</li>
   <li onclick="tab('tab4')">标题四</li>
  </ul>
  </div>
  <div id="tab">
   <div id="tab1">内容一</div>
  <div id="tab2">内容二</div>
   <div id="tab3">内容三</div>
  <div id="tab4">内容四</div>
  </div>
 </div>
 </body>
 </html>

JS 方法二。先隐藏所有内容，再显示选中区域

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style>
*{
 padding: 0;
 margin: 0;
}
li{
 list-style: none;
float:left;
}
#tabCon{
 clear: both;
}
#tabCon_1{
display: none;
}
#tabCon_2{
 display: none;
}
#tabCon_3{
display: none;
}
</style>
<script>
function changeTab(tabCon_num){
for(i=0;i<=3;i++) { 
 document.getElementById("tabCon_"+i).style.display="none"; //将所有的层都隐藏 
 } 
 document.getElementById("tabCon_"+tabCon_num).style.display="block";//显示当前层 
} 
</script>
</head>
<body>
<div id="tanContainer">
 <div id="tab">
 <ul>
  <li onclick="changeTab('0')">标题一</li>
  <li onclick="changeTab('1')">标题二</li>
  <li onclick="changeTab('2')">标题三</li>
  <li onclick="changeTab('3')">标题四</li>
 </ul>
</div>
 <div id="tabCon">
 <div id="tabCon_0">内容一</div>
 <div id="tabCon_1">内容二</div>
 <div id="tabCon_2">内容三</div>
 <div id="tabCon_3">内容四</div>
</div>
</div>
</body>
</html>

jQuery 方法

<html>
    <head>
        <meta charset="utf-8">
        <script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
            <style>
                body{
                    widows: 500px;
                    height: 500px;
                }
                ul{
                    width: 500px;
                    height: 30px;
                    border: 1px solid grey;
                }
                li{
                    border: 1px solid grey;
                    float: left;
                    width: 248px;
                    height: 28px;
                }
                .tab{
                    background: pink;
                    width: 500px;
                    height: 400px;
                }
                .hide{
                    display: none;
                }
                 .active{
                           color: red;
                 }         
            </style>
            <script type="text/javascript">    
                $(document).ready(function(){
                    //Default
                   $('li:first').addClass('active');
                   $(".tab").addClass('hide');
                   $(".tab:first").removeClass('hide');
                   //Click Event
                  $("ul").find("li").on('click',function(){   //find()遍历所有li
                                   var i=$(this).index();       //index()获得当前元素索引（0，1，2，。。。）
                                   $('li').removeClass('active');
                                 $(".tab").addClass('hide');
                                 $(".tab").eq(i).removeClass('hide');  //eq()返回当前选择器中指定索引的元素
                                 $(this).addClass('active');
                  });
                    });
            
            </script>
    </head>
    <body>
    <ul >
        <li >首页</li>
        <li >新闻</li>
    </ul>
    <div class="content">
        <div  class="tab">首页内容</div>
        <div  class="tab" >新闻内容  *************</div>
    </div>
    </body>
</html>