为何不能隐藏menu

<!doctype html>
<html>
<head>
    <meta charset="UTF-8">
    <title>下拉菜单</title>
    <style type="text/css">
body,ul,li{ margin:0; padding:0; font-size:13px;}
ul,li{list-style:none;}
#divselect{width:186px; margin:80px auto; position:relative; z-index:10000;}
#divselect cite{width:150px; height:24px;line-height:24px; display:block; color:#807a62; cursor:pointer;font-style:normal;
padding-left:4px; padding-right:30px; border:1px solid #333333;
background:url(xjt.png) no-repeat right center;}
#divselect ul{width:184px;border:1px solid #333333; background-color:#ffffff; position:absolute; z-index:20000; margin-top:-1px; display:none;}
#divselect ul li{height:24px; line-height:24px;}
#divselect ul li a{display:block; height:24px; color:#333333; text-decoration:none; padding-left:10px; padding-right:10px;}
   </style>
   <script type="text/javascript">
window.onload=function(){
   var box=document.getElementById('divselect'),
        title=box.getElementsByTagName('cite')[0],
        menu=box.getElementsByTagName('ul')[0],
        as=box.getElementsByTagName('a'),
      index=-1;

    // 点击三角时
    title.onclick=function(e){
      // 执行脚本
      e = e || window.event;
      menu.style.display = 'block';
      if(e.Propagation){
         e.propagation();
      }else{
           e.cancleBubble = true;
      }
    }

    document.onkeyup = function(e){
        e = e || window.event;
        if(e.keyCode == 40){//向下
            index++;
            if(index>=as.length){
                index = 0;
            }
            changeB();
        }
        if(e.keyCode == 38){//向上
            if(index<=0){
                index = as.length-1;
            }
            index--;
            changeB();
        }
        if(e.keyCode == 13){
            title.innerHTML = as[index].innerHTML;
            for(var i=0;i<as.length;i++){
                as[i].style.background = 'none';
            }
            index = -1;
            menu.style.display = 'none';
        }

    }
   // 滑过滑过、离开、点击每个选项时
      // 执行脚本
    for(var i=0;i<as.length;i++){
        as[i].onmouseover = function(){
            this.style.background = 'grey';
        }
        as[i].onmouseout = function(){
            this.style.background = 'none';
        }
        as[i].onclick = function(e){
            e = e || window.event;
            if(e.Propagation){
                e.propagation();
            }else{
                e.cancleBubble = true;
            }
            menu.style.display = 'none';
            title.innerHTML = this.innerHTML;
        }
    }

    function changeB(){
        for(var i=0;i<as.length;i++){
            as[i].style.background = 'none';
        }
        as[index].style.background = 'grey';
    }
    document.onclick = function(){
        menu.show.display = 'none';
    }
}
   </script>
</head>
<body>
   <div id="divselect">
      <cite>请选择分类</cite>
      <ul>
         <li id="li"><a href="javascript:;" selectid="1">ASP开发</a></li>
         <li><a href="javascript:;" selectid="2">.NET开发</a></li>
         <li><a href="javascript:;" selectid="3">PHP开发</a></li>
         <li><a href="javascript:;" selectid="4">Javascript开发</a></li>
         <li><a href="javascript:;" selectid="5">Java特效</a></li>
      </ul>
    </div>
</body>
</html>

Purplefly

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1回答

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