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The simplest tab switching based on javascript

高洛峰

Feb 04, 2017 pm 02:27 PM

This article teaches you the simplest tab switching effect achieved with native js. When the mouse slides over, the corresponding hidden part is displayed and the style changes.
The code is the most concise, js behavior optimized version, just copy and paste.

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>javascript-实现最简易选项卡</title>
<style>
body,ul,li{margin:0;padding:0;}
body{font:12px/1.5 Tahoma;}
#outer{width:450px;margin:10px auto;}
#tab{overflow:hidden;zoom:1;background:#000;border:1px solid #000;}      
#tabli{float:left;color:#fff;height:30px;
cursor:pointer;line-height:30px;list-style-type:none;
padding:0 20px;}
#tab li.current{color:#000;background:#ddd;}
#content{border:1px solid #000;border-top-width:0;}
#content ul{line-height:25px;
display:none;margin:0 30px;padding:10px 0;}
</style>
</head>
<body>
<div id="outer">
  <ul id="tab">
    <li>第一课</li>
    <li>第二课</li>
    <li>第三课</li>
  </ul>
  <div id="content">
    <ul style="display:block;">
      <li>每天一个</li>
      <li>小应用</li>
      <li>提升你的</li>
      <li>javascript</li>
      <li>基础</li>
    </ul>
    <ul>
      <li>改变网页背景颜色</li>
      <li>函数传参</li>
      <li>高重用性函数的编写</li>
      <li>126邮箱全选效果</li>
      <li>循环及遍历操作</li>
      <li>调试器的简单使用</li>
      <li>典型循环的构成</li>
      <li>for循环配合if判断</li>
    </ul>
    <ul>
      <li>函数详解：函数构成、调用、事件、传参数</li>
      <li>定时器的使用：setInterval、setTimeout</li>
      <li>定时器应用：站长站导航效果</li>
      <li>定时器应用：自动播放的选项卡</li>
      <li>定时器应用：数码时钟</li>
      <li>程序调试方法</li>
    </ul>
  </div>
</div>
<script type="text/javascript">
(function(){
    var $ = function(id){
      return document.getElementById(id);
    }
    //取到相应的dom节点
    var myli = $("tab").getElementsByTagName("li");
    var myul = $("content").getElementsByTagName("ul");
    //循环，让每个小选项卡对应相应的ul，对应的显示，不对应的隐藏
    for(var i=0;i<myli.length;i++){
      myli[i].index = i; //取到对应的下标
      myli[i].onmouseover=function(){
        //循环要显示的ul，当下标等于鼠标滑过事件的li时，样式才发生改变
        for(var n=0;n<myli.length;n++){
          myli[n].className ="";
          myul[n].style.display="none";
          this.className="current";
          myul[this.index].style.display="block";
        }
      }
  
    }
})()
  
</script>
</body>
</html>

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