麻烦看下错在哪里了，不知道哪里出错，点击没反应-慕课网

麻烦看下错在哪里了，不知道哪里出错，点击没反应

来源：5-1 编程挑战

东方既白233

2017-03-09 20:46

<!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;}
#divselect cite:after{content:"▼";display:block;position:absolute;right:5px;top:3px;}
</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(event){
      // 执行脚本
      event = event||window.event;
      if(event.stopPropagation){
          event.stopPropagation();
      }else{
          event.cancelBubble=true;
      }
      menu.style.display = "block";
        document.onkeyup = function(event){
            event = event||window.event;
            if(event.keyCode == 40){
                if(index > as.length){
                index = 0;
                }
                index++;
                for(var i=0;i<as.length;i++){
                    as[i].style.background = '#fff';
                }
                as[index].style.background = "#ccc";
                if(index > as.length){
                index = 0;
                }
            if(event.keyCode == 38){
                if(index <= 0)
                index = as.length-1;
            
                for(var i=0;i<as.length;i++){
                    as[i].style.background = '#fff';
                }
                index--;
                as[index].style.background = "#333333";
        } 
    }   
    
    }
   // 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="#333333";
            }
            as[i].onmouseout=function(){
                this.style.background="#FFF";
            }
            as[i].onclick=function(e){
                e = e||window.event;
                if(e.stopPropagation){
                    e.stopPropagation();
                }else{
                    e.cancelBubble=true;
                }
                
              
              menu.style.display = "none";
                title.innerHTML =this.innerHTML;
                
            }
        }
       
     
   // 点击页面空白处时
       // 执行脚本
            document.onclick = function(){
   menu.style.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>

写回答关注