学习javascript面向对象 实例讲解面向对象选项卡

<div class="box" id="box"> <ul class="list">  <li class="in_active">第一张选项卡</li>  <li class="in">第二张选项卡</li>  <li class="in">第三张选项卡</li> </ul> <nav class="conList">  <a class="con_active" href="javascript:;">第一个控制按钮</a>  <a class="con" href="javascript:;">第二个控制按钮</a>  <a class="con" href="javascript:;">第三个控制按钮</a> </nav> </div>

/*in为选项卡普通状态，默认不显示*/.in,.in_active{ display: none; width: 600px; height: 100px; background: orange; font-size: 50px; line-height: 100px; text-align: center;}/*in_active为选项卡选中状态，选中后显示*/.in_active{ display: block;}/*con为按钮普通状态，默认文字颜色为黑色*/.con,.con_active{ color: black; background-color: orange;}/*con_active为按钮选中状态，选中后文字颜色为白色*/.con_active{ color: white; }

function Tab(obj){ /*元素获取*/ //获取选项卡展示部分 this.oList = obj.getElementsByTagName('ul')[0]; this.aIn = this.oList.getElementsByTagName('li'); //获取选项卡控制部分 this.oConList = obj.getElementsByTagName('nav')[0]; this.aCon = this.oConList.getElementsByTagName('a'); /*变量设置*/ //选项卡张数 this.count = this.aIn.length; //当前第几张 this.cur = 0; var _this = this; for(var i = 0; i < this.count; i++){  //设置索引  this.aCon[i].index = i;  //给按钮添加事件  this.aCon[i].onclick = function(){   _this.cur = this.index;   _this.switch();  } }}Tab.prototype.switch = function(){ //去掉所有 for(var i = 0; i < this.count; i++){  this.aIn[i].className = 'in';  this.aCon[i].className = 'con'; } //显示当前 this.aIn[this.cur].className = 'in_active'; this.aCon[this.cur].className = 'con_active'; }//获取选项卡元素var oBox = document.getElementById('box');//构造选项卡对象var tab1 = new Tab(oBox);