web前端|js教程
JavaScript,下拉菜单
web前端-js教程
本文实例讲述了JavaScript简单下拉菜单实例代码。分享给大家供大家参考。具体如下：
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这是一款JavaScript实现的下拉菜单演示代码，带渐变效果的CSS+jQuery菜单，向下滑出型的菜单，最高支持两级，网上常见到的一种菜单风格，希望大家喜欢哦。
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运行效果截图如下：
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在线演示地址如下：
/js//js-simple-xlcd-down-menu-codes/
具体代码如下：
JavaScript下拉菜单演示代码body {margin:25px; font:12px Verdana, Arial, Helvetica}* {padding:0; margin:0}.dropdown {float:left; padding-right:0px}.dropdown dt {width:80px; border:2px solid #9ac1c9; padding:8px; font-weight:bold; cursor:pointer; background:url()}.dropdown dt:hover {background:url()}.dropdown dd {position:absolute; overflow:hidden; width:100px; display:none; background:#fff; z-index:200; opacity:0}.dropdown ul {width:100px; border:2px solid #9ac1c9; list-style:none; border-top:none}.dropdown li {display:inline}.dropdown a, .dropdown a:active, .dropdown a:visited {display:block; padding:5px; color:#333; text-decoration:none; background:#eaf0f2; width:194px}.dropdown a:hover {background:#d9e1e4; color:#000}.dropdown .underline {border-bottom:1px solid #b9d6dc}var DDSPEED = 10;var DDTIMER = 15;function ddMenu(id,d){ var h = document.getElementById(id + -ddheader); var c = document.getElementById(id + -ddcontent); clearInterval(c.timer); if(d == 1){ clearTimeout(h.timer); if(c.maxh && c.maxh <= c.offsetHeight){return} else if(!c.maxh){ c.style.display = lock; c.style.height = auto; c.maxh = c.offsetHeight; c.style.height = px; } c.timer = setInterval(function(){ddSlide(c,1)},DDTIMER); }else{ h.timer = setTimeout(function(){ddCollapse(c)},50); }}// collapse the menu //function ddCollapse(c){ c.timer = setInterval(function(){ddSlide(c,-1)},DDTIMER);}function cancelHide(id){ var h = document.getElementById(id + -ddheader); var c = document.getElementById(id + -ddcontent); clearTimeout(h.timer); clearInterval(c.timer); if(c.offsetHeight < c.maxh){ c.timer = setInterval(function(){ddSlide(c,1)},DDTIMER); }}function ddSlide(c,d){ var currh = c.offsetHeight; var dist; if(d == 1){ dist = (Math.round((c.maxh - currh) / DDSPEED)); }else{ dist = (Math.round(currh / DDSPEED)); } if(dist <= 1 && d == 1){ dist = 1; } c.style.height = currh + (dist * d) + px; c.style.opacity = currh / c.maxh; c.style.filter = alpha(opacity= + (currh * 100 / c.maxh) + ); if((currh (c.maxh - 2) && d == 1)){ clearInterval(c.timer); } }
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