js制作可以延时消失的菜单

js制作可以延时消失的菜单

代码:

<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>无标题文档</title> <style> *{padding:0;margin:0;} ul{list-style:none;} a{text-decoration:none;} #menu{height:200px;border:1px solid #ccc;margin:40px auto;position:relative;} #title{position:absolute;left:0;top:0;height:50px;border:1px solid yellow;background:blue;} #title li{text-align:center;width:80px;height:30px;line-height:30px;float:left;background:#f1f1f1;border-radius:10px;color:#000;font-weight:bold;margin:10px 5px;cursor:pointer;} #subtitle{height:30px;;border:1px solid #ccc;border-radius:10px;position:absolute;top:60px;left:10px;} #subtitle:before{content:'';position:absolute;border-top:7px solid transparent;border-right:7px solid transparent;border-bottom:9px solid #ccc;border-left:7px solid transparent;top:-16px;left:30px;} #subtitle:after{content:'';position:absolute;border-top:7px solid transparent;border-right:7px solid transparent;border-bottom:9px solid #fff;border-left:7px solid transparent;top:-15px;left:30px;} #subtitle a{display:inline-block;height:20px;line-height:20px;margin:5px 5px;float:left;} #subtitle a:hover{text-decoration:underline;} </style> <script> window.onload = function () { var title = document.getElementById('title'); var subtitle = document.getElementById('subtitle'); var aA = subtitle.getElementsByTagName('a'); var aLi = title.getElementsByTagName('li'); var arr = [ { title : '首页', subtitle : ['首页1','首页2','首页3']}, { title : '关于我们', subtitle : ['关于我们1','关于我们2','关于我们3','关于我们4','关于我们5']}, { title : '课程', subtitle : ['课程1','课程2','课程3']}, { title : '新闻', subtitle : ['新闻1','新闻2']}, ]; var timer = null; for ( var i = 0; i < arr.length; i++ ) { var oLi = document.createElement('li'); oLi.innerHTML = arr[i].title; oLi.index = i; oLi.onmouseover = function () { var width = parseInt(getStyle(this,'width')); var marginRight = parseInt(getStyle(this,'marginRight')); clearTimeout(timer); subtitle.innerHTML = ''; createA(this.index); subtitle.style.left = 10 + (width + marginRight) * this.index + 'px'; subtitle.style.display = 'block'; } oLi.onmouseout = function () { timer = setTimeout(function () { subtitle.style.display = 'none'; }, 100); } title.appendChild(oLi); } subtitle.onmouseover = function () { clearTimeout(timer); this.style.display = 'block'; } subtitle.onmouseout = function () { this.style.display = 'none'; } createA(0); function createA(index){ for ( var j = 0; j < arr[index].subtitle.length; j++ ){ var oA = document.createElement('a'); oA.innerHTML = arr[index].subtitle[j]; subtitle.appendChild(oA); } } function getStyle(ele, attr) { return ele.currentStyle ? ele.currentStyle[attr] : getComputedStyle(ele,0)[attr]; } } </script> </head> <body> <div> <ul> </ul> <div> </div> </div> </body> </html>

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