本文实例讲述了jquery实现的淡入淡出下拉菜单效果。分享给大家供大家参考。具体如下：
这是一款jQuery带有淡入淡出效果的下拉菜单，可作为一个下拉导航菜单的模板，移动鼠标到一级主菜单上看一看，在有包括二级子菜单的菜单项上悬停时，二级菜单渐变显示出来，兼容性也是很不错的，希望大家喜欢哈。
运行效果截图如下：
在线演示地址如下：
http://demo.jb51.net/js/2015/jquery-fade-in-out-menu-style-codes/
具体代码如下：
jQuery下拉菜单效果 body, div, dl, dt, dd, ul, ol, li, h1, h2, h3, h4, h5, h6, pre, form, fieldset, input, textarea, p, blockquote, th, td{margin:0; padding:0} table{border-collapse:collapse; border-spacing:0} fieldset, img{border:0} address, caption, cite, code, dfn, em, strong, th, var{font-style:normal; font-weight:normal} ol, ul{list-style:none} caption, th{text-align:left} h1, h2, h3, h4, h5, h6{font-size:100%; font-weight:normal} q:before, q:after{content:''} abbr, acronym{border:0} :focus{outline:0} ins{text-decoration:none} del{text-decoration:line-through} a { color: #fff; text-decoration: none; } a:hover { text-decoration: underline; } a { color: black } #nav li { float: left; position: relative; } #nav li a { background: #d6cfbd; border: 3px solid #4f4026; color: #333; display: block; margin: 0 5px 0 0; padding: 5px 8px; } #nav li a:hover { background: #f7f7f7; text-decoration: none; } #nav { display: block; height: 35px; padding: 10px 0; width: 500px; z-index: 100; position: absolute;} #nav > li > a { border-top-left-radius: 10px; border-top-right-radius: 10px; -moz-border-radius-topleft: 10px; -moz-border-radius-topright: 10px; -webkit-border-top-left-radius: 10px; -webkit-border-top-right-radius: 10px;} #nav li ul { background: #e1ddd3; border: 3px solid #4f4026; color: #333; display: none; margin: -3px 0 0 0; width: 200px; position: absolute; } #nav li ul li { width: 100% } #nav li ul li a { background: none; border: none; line-height: 30px; margin: 0; padding: 0 0 0 5px; } #nav li ul li a:hover { background: #f7f7f7;} #nav li.current > a { background: #f7f7f7; } #nav li:hover > ul.child { display: block; } jQuery sub-navigation with CSS fall-back