JavaScript实现多层颜色选项卡嵌套

时间:2020-09-21 八弟吖人气:0

本文着重为大家仔细讲解了JavaScript实现多层颜色选项卡嵌套，文中代码实例讲解的非常细致，希望能够帮助到您，欢迎大家阅读和收藏

这是学JavaScript时候的一个作业，如果没有思路还是挺有难度的，但是思路正确的话一步一步来就很简单做出来了。

实现效果

HTML部分代码

 <div class="box" id="box">
  <ul id="leftBox">
   <li class="active">a</li>
   <li>b</li>
   <li>c</li>
   <li>d</li>
  </ul>
  <div id="rightBox">
   <div id="rightBox1" class="active">
    <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >a1</a>
    <ul class="tabUl">
     <li class="hover">a1</li>
     <li>a2</li>
     <li>a3</li>
     <li>a4</li>
    </ul>
   </div>
   <div id="rightBox2">
    <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >b1</a>
    <ul class="tabUl">
     <li class="hover">b1</li>
     <li>b2</li>
     <li>b3</li>
     <li>b4</li>
    </ul>
   </div>
   <div id="rightBox3">
    <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >c1</a>
    <ul class="tabUl">
     <li class="hover">c1</li>
     <li>c2</li>
     <li>c3</li>
     <li>c4</li>
     <li>c5</li>
     <li>c6</li>
    </ul>
   </div>
   <div id="rightBox4">
    <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >d1</a>
    <ul class="tabUl">
     <li class="hover">d1</li>
     <li>d2</li>
     <li>d3</li>
     <li>d4</li>
    </ul>
   </div>
  </div>
</div>

css部分代码

<style>
  * {
   margin: 0px;
   padding: 0px;
   list-style: none;
   text-decoration: none;
  }

  .box {
   width: 800px;
   border: 1px solid #000000;
   margin: 20px auto;
   background: blue;
  }

  .box:after {
   content: "";
   display: block;
   clear: both;
  }

  #leftBox {
   float: left
  }

  #rightBox {
   float: left;
  }

  #leftBox li {
   width: 200px;
   height: 89px;
   background: red;
   margin-bottom: 2px;
   color: #fff;
   font: 50px/89px "黑体";
   text-align: center;
  }

  #rightBox div {
   display: none;
  }

  #rightBox .active {
   display: block;
  }

  #rightBox a {
   display: block;
   width: 600px;
   height: 325px;
   background: #0F0;
   font-size: 100px;
   color: #000;
   text-align: center;
   text-decoration: none;
   line-height: 360px;
  }

  .tabUl {
   display: table;
   width: 100%;
  }

  .tabUl li {
   display: table-cell;
   background: #909;
   color: #fff;
   font-size: 20px;
   text-align: center;
   height: 40px;
   line-height: 40px;
   border-right: 2px solid #03C;
   cursor: pointer;
  }

  .tabUl li.hover {
   background: #fff;
   color: #000;
  }

  #leftBox .active {
   background: yellow;
   color: #000;
  }
</style>

JavaScript实现代码

思路：鼠标移入左边的每个li后，都会改变他的颜色，所以只需要改变class名，同时右边也会显示对于的div，有对应的话一般都会用到自定义索引值和this…

<script>
  /* 
  点击左边的li后，所点击li加上class名，其它清除所有，然后右边对应索引值的div也加上class=active，所以要用到this

   */

  //获取元素
  var lUl = document.getElementById('leftBox')
  var rUl = document.getElementById('rightBox')
  var lLi = lUl.getElementsByTagName('li')
  var oDiv = rUl.getElementsByTagName('div')

  //改变左边样式
  for (var i = 0; i < lLi.length; i++) {
   //自定义索引
   lLi[i].index = i
   lLi[i].onmouseenter = function () {
    //清空所有classname
    for (var j = 0; j < lLi.length; j++) {
     lLi[j].className = ''
     oDiv[j].className = ''
    }
    //给相应的li添加上classname
    this.className = 'active'
    oDiv[this.index].className = 'active'
   }
  }


  //右边
  for (var k = 0; k < oDiv.length; k++) {
   fn(oDiv[k])
  }
  function fn(parent) {
   //获取用到的元素
   var rLi = parent.getElementsByTagName('li')
   var oa = parent.getElementsByTagName('a')[0]
    for (var i = 0; i < rLi.length; i++) {
     rLi[i].onmouseenter = function(){
      for (j = 0; j < lLi.length; j++) {
       rLi[j].className = ''
      }
      this.className = 'hover'
      //把li标签中的文字传到a标签中
      oa.innerHTML = this.innerHTML
     }
    
   }
   
  }
</script>

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