JavaScript Tab菜单实现过程解析

代码实现与运行效果

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>tab</title>
  <style>
    *{
      margin: 0px;
      padding: 0px;
    }
      .current{
        background-color: darkgray;
        color: yellow;
        width: 50px;
        height: 30px;
        line-height: 30px;
        float: left;

       }
      .top{
        float: left;
        width: 50px;
        height: 30px;
        line-height: 30px;
      }
    #topMenu{
      width: 400px;
      height: 30px;
      background-color: aquamarine;
      margin-left: 400px;
      float: left;

    }
    #bottomMenu{
      clear: both;
      float: left;
      width: 400px;
      height: 400px;
      margin-left: 400px;
      background-color: chocolate;
    }
    .hide{
      display: none;
    }
    .current-content{
      color: blue;
      font-size: 50px;
    }
  </style>
  <script src="http://code.jquery.com/jquery-3.3.1.min.js"></script>
</head>
<body>
<div id="topMenu">
  <div xxx="c1" class="top current" onclick="tab(this)">menu1</div>
  <div xxx="c2" class="top" onclick="tab(this)">menu2</div>
  <div xxx="c3" class="top" onclick="tab(this)">menu3</div>

</div>
<div id="bottomMenu">
  <div id="c1" class="current-content">content1</div>
  <div id="c2" class="hide">content2</div>
  <div id="c3" class="hide">content3</div>
</div>

<script>
  function tab(self){
    $(self).addClass("current");
    $(self).siblings().removeClass("current");
    var s=$(self).attr("xxx");
    $("#"+s).removeClass("hide");
    $("#"+s).addClass("current-content");
    $("#"+s).siblings().addClass("hide");
    $("#"+s).siblings().removeClass("current-content");
  }
</script>
</body>
</html>