为啥我控制不了display=none？-慕课网

为啥我控制不了display=none？

来源：10-1 编程挑战

慕数据1008917

2017-02-28 16:03

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>实践题 - 选项卡</title>
    <style type="text/css">
     /* CSS样式制作 */  
     *{font-family:微软雅黑;font-size:13px;}
     div,td{border:1px solid #888888;}
     td{height:30px;width:60px;text-align:center;cursor:pointer;}
     .content_1,.content_2,.content_3{height:150px;width:300px;margin-top:-2px;padding-top:10px;border-top:2px solid brown;line-height:200%;}
     .content_2,.content_3{display:none;}
    </style>
    <script type="text/javascript">
        window.onload = function()
        {
            var a=document.getElementsByTagName("td");
            document.getElementById("hah").value="执行到了onload里面";
            for(var i=0;i<a.length;i++)
            {
                change(a[i],i);
            }
        }
    
       function change(obj,i)
       {
           obj.onclick=function()
           {
               for(var h=0;h<=2;h++)
               {
                   document.getElementById("hah").value=h;
                   if(h==i)
                   {
                        document.getElementsByClassName(content).style.display="block";
             obj.style.borderTop="1px solid brown";
             var content="content_"+(i+1);
                         document.getElementById("hah").value=content;
                   }
                   else
                   {
                       document.getElementsByClassName(content).style.display="none";
                   }
                   
               }
                   
              
             
           }
       }
    </script>
 
</head>
<body>
<!-- HTML页面布局 -->
<table>
    <tr>
        <td>房产</td>
        <td>家居</td>
        <td>二手房</td>
    </tr>
</table>

<div>
     275万购昌平邻铁三居 总价20万买一居<br>
     200万内购五环三居 140万安家东三环<br>
     北京首现零首付楼盘 53万购东5环50平<br>
     京楼盘直降5000 中信府 公园楼王现房
</div>
<div>
     40平出租屋大改造 美少女的混搭小窝<br>
     经典清新简欧爱家 90平老房焕发新生<br>
     新中式的酷色温情 66平撞色活泼家居<br>
     瓷砖就像选好老婆 卫生间烟道的设计
</div>
<div>
     通州豪华3居260万 二环稀缺2居250w甩<br>
     西3环通透2居290万 130万2居限量抢购<br>
     黄城根小学学区仅260万 121平70万抛!<br>
     独家别墅280万 苏州桥2居优惠价248万
</div>
<input id="hah" type="text">
</body>
</html>

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