js下拉菜单（鼠标+键盘双操作）

来源：互联网发布：mysql alias 编辑：程序博客网时间：2024/05/21 00:52
<!doctype html><html lang="en"><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(event){      // 执行脚本      event=event||window.event;      stopPropagation(event);      if(menu.style.display!='block')        menu.style.display='block';      else        menu.style.display='none';    }      document.onkeyup=function(event){        event=event||window.event;        if(menu.style.display=='block')          if(event.keyCode==38){              if(index>0){                  as[index].style.background='#FFF';                  index--;                  as[index].style.background='#999';              }          }          else if (event.keyCode==40){            if(index<4){              if(index>=0)                as[index].style.background='#FFF';              index++;              as[index].style.background='#999';            }          }    }                // 滑过滑过、离开、点击每个选项时      // 执行脚本       for(var i=0;i<5;i++)        as[i].onmouseover=function(){          this.style.background='#999';        }       for(var i=0;i<5;i++)        as[i].onmouseout=function(){          this.style.background='#FFF';        }        for(var i=0;i<5;i++)        as[i].onclick=function(event){          event=event||window.event;          stopPropagation(event);          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';       }      function stopPropagation(event){        event=event||window.event;        if(event.stopPropagation)          event.stopPropagation();        else          event.cancelBubble=true;      } }   </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>
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