JavaScript简单下拉菜单实例代码

2019-11-20 11:35:50

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来源：转载

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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：

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。

运行效果截图如下：

在线演示地址如下：

http://demo.VeVB.COm/js/2015/js-simple-xlcd-down-menu-codes/

具体代码如下：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>JavaScript下拉菜单演示代码</title><style type="text/css">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}</style><script language="javascript">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 = 'block';   c.style.height = 'auto';   c.maxh = c.offsetHeight;   c.style.height = '0px';  }  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 < 2 && d != 1) || (currh > (c.maxh - 2) && d == 1)){   clearInterval(c.timer);   }   }   </script>   </head>   <body>   <br><br>   <dl class="dropdown">   <dt id="one-ddheader" onmouseover="ddMenu('one',1)" onmouseout="ddMenu('one',-1)">One</dt>   <dd id="one-ddcontent" onmouseover="cancelHide('one')" onmouseout="ddMenu('one',-1)">   <ul>   <li><a href="#" class="underline">武林网</a></li>   <li><a href="#" class="underline">Navigation Item 2</a></li>   <li><a href="#" class="underline">Navigation Item 3</a></li>   <li><a href="#" class="underline">Navigation Item 4</a></li>   <li><a href="#">Navigation Item 5</a></li> </ul> </dd> </dl> <dl class="dropdown"> <dt id="two-ddheader" onmouseover="ddMenu('two',1)" onmouseout="ddMenu('two',-1)">Two</dt> <dd id="two-ddcontent" onmouseover="cancelHide('two')" onmouseout="ddMenu('two',-1)"> <ul> <li><a href="#" class="underline">Navigation Item 1</a></li> <li><a href="#" class="underline">Navigation Item 2</a></li> <li><a href="#" class="underline">Navigation Item 3</a></li> <li><a href="#" class="underline">默认主页</a></li> <li><a href="#">Navigation Item 5</a></li> </ul> </dd> </dl> <dl class="dropdown"> <dt id="three-ddheader" onmouseover="ddMenu('three',1)" onmouseout="ddMenu('three',-1)">Two</dt> <dd id="three-ddcontent" onmouseover="cancelHide('three')" onmouseout="ddMenu('three',-1)"> <ul> <li><a href="#" class="underline">Navigation Item 1</a></li> <li><a href="#" class="underline">Navigation Item 2</a></li> <li><a href="#" class="underline">Navigation Item 3</a></li> <li><a href="#" class="underline">Navigation Item 4</a></li> <li><a href="#">Navigation Item 5</a></li> </ul> </dd> </dl> <dl class="dropdown"> <dt id="four-ddheader" onmouseover="ddMenu('four',1)" onmouseout="ddMenu('four',-1)">Two</dt> <dd id="four-ddcontent" onmouseover="cancelHide('four')" onmouseout="ddMenu('four',-1)"> <ul> <li><a href="#" class="underline">默认主页</a></li> <li><a href="#" class="underline">Navigation Item 2</a></li> <li><a href="#" class="underline">Navigation Item 3</a></li> <li><a href="#" class="underline">Navigation Item 4</a></li> <li><a href="#">Navigation Item 5</a></li> </ul> </dd> </dl> <dl class="dropdown"> <dt id="fir-ddheader" onmouseover="ddMenu('fir',1)" onmouseout="ddMenu('fir',-1)">Two</dt> <dd id="fir-ddcontent" onmouseover="cancelHide('fir')" onmouseout="ddMenu('fir',-1)"> <ul> <li><a href="#" class="underline">Navigation Item 1</a></li> <li><a href="#" class="underline">默认主页</a></li> <li><a href="#" class="underline">Navigation Item 3</a></li> <li><a href="#" class="underline">Navigation Item 4</a></li> <li><a href="#">Navigation Item 5</a></li> </ul> </dd> </dl> <dl class="dropdown"> <dt id="six-ddheader" onmouseover="ddMenu('six',1)" onmouseout="ddMenu('six',-1)">Two</dt> <dd id="six-ddcontent" onmouseover="cancelHide('six')" onmouseout="ddMenu('six',-1)"> <ul> <li><a href="#" class="underline">Navigation Item 1</a></li> <li><a href="#" class="underline">Navigation Item 2</a></li> <li><a href="#" class="underline">Navigation Item 3</a></li> <li><a href="#" class="underline">Navigation Item 4</a></li> <li><a href="#">Navigation Item 5</a></li> </ul> </dd> </dl> <dl class="dropdown"> <dt id="seven-ddheader" onmouseover="ddMenu('seven',1)" onmouseout="ddMenu('seven',-1)">Two</dt> <dd id="seven-ddcontent" onmouseover="cancelHide('seven')" onmouseout="ddMenu('seven',-1)"> <ul> <li><a href="#" class="underline">Navigat</a></li> <li><a href="#" class="underline">Naviga</a></li> <li><a href="#" class="underline">Navigati</a></li> <li><a href="#" class="underline">Navigat</a></li> <li><a href="#">Navigatio</a></li> </ul> </dd> </dl> <div style="clear:both"> </div></body></html>

希望本文所述对大家的JavaScript程序设计有所帮助。

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