2_展开菜单

1 <div><p id="btn">输入法</p>
2 <ul id="list" style="display:block;">
3 <li>搜狗输入法</li>
4 <li>智能全拼输入法</li>
5 <li>腾讯输入法</li>
6 <li>日文输入法</li>
7 </ul></div>
8 </body>

1 *{ margin:0; padding:0;}
2 div{ width:140px; overflow:hidden; font-size:14px; }
3 #btn{ display:block; text-align:center; background:#006; color:#fff; padding:4px 0;}
4 #list{ display:block;}
5 #list li{ display:block; background:#09F; list-style:none; padding:6px 0 6px 10px; font-size:14px;}

 1 window.onload=function ()
 2 {
 3     var obtn=document.getElementById(‘btn‘);
 4     var olist=document.getElementById(‘list‘);    
 5     obtn.onclick=function(){
 6         if( olist.style.display==‘block‘){   //注意这里是等于，  不“=”！
 7             olist.style.display=‘none‘;
 8             }
 9         else{ olist.style.display=‘block‘;}
10         }
11 }