web前端|css教程
css 导航菜单
web前端-css教程
本文实例为大家分享了纯CSS实现多级下拉横向导航菜单代码，供大家参考，具体内容如下
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先看看效果图：
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实现代码：
CSS代码：
/* for this demo only */ #backgroundHolder { width:750px; height:500px; padding-top:10px; margin:0 auto; } /* ---------------------------------------------------------------------------- */ /* default styling */ .nav, .nav ul { list-style-type:none; margin:0; padding:0; } .nav a { text-decoration:none; } .nav { font-family: arial, sans-serif; font-size:12px; width:650px; margin:0 auto; } /* style the links */ .nav a { background:url(ulmulti3/box.jpg) no-repeat rightright center; } .nav a.top { background:url(ulmulti3/box.jpg) no-repeat rightright top; } .nav a.top2 { background:url(ulmulti3/box2.jpg) no-repeat rightright top; } .nav a.bottombottom { background:url(ulmulti3/box.jpg) no-repeat rightright bottombottom; } .rightright ul ul a { background:url(ulmulti3/box3.jpg) no-repeat rightright center; } .rightright ul ul a.top2 { background:url(ulmulti3/box3.jpg) no-repeat rightright top; } .rightright ul ul a.bottombottom { background:url(ulmulti3/box3.jpg) no-repeat rightright bottombottom; } /* style the element so that is does not affect the size of the link */ .nav a b { color:#fff; font-weight:normal; display:block; padding:5px 10px 5px 15px; } .nav .fly .main b { background: transparent url(ulmulti3/arrow.jpg) no-repeat 117px 9px; } .nav .down b { background: transparent url(ulmulti3/arrow2.jpg) no-repeat 115px 11px; } .nav .rightright ul b { text-align:rightright; } .nav .rightright ul ul b { padding: 5px 15px 5px 10px; } .nav .rightright ul .main b { background: transparent url(ulmulti3/arrow3.jpg) no-repeat 15px 9px; text-align:rightright; } .nav .rightright ul ul .main b { background: transparent url(ulmulti3/arrow3.jpg) no-repeat 5px 9px; text-align:rightright; } /* HEIGHT */ .nav ul ul { top:-24px; } /* position the top of the flyout first sub menus */ .nav ul ul ul { top:-25px; } /* position the top of the flyout second and third sub menus */ .nav ul.two { top:-40px; } /* position the top of the flyout sub menus with previous text on two lines */ /* WIDTH change this WITH CARE to suit your requirements *//*set the link width here*/ .nav .drop, .nav a { width:130px; } .nav ul li { max-width:130px; } /* fix for IE8 */ /* set the left flyout position here */ .nav ul ul { left:130px; } /* set the right flyout position here */ .nav li.rightright ul ul { left:auto; rightright:120px; } .nav li.rightright ul ul ul { left:auto; rightright:130px; } /* make this WIDTH - 1px */ /* or WIDTH - 0.063em if using em sizing */ .nav a { margin-right:-129px; } /* ---------------------------------------------------------------------------- *//* DO NOT CHANGE ANYTHING BELOW */ .nav li { float:left; } /* fixes IE bugs, and allows for clearing */ .nav ul { float:left; position:relative; z-index:20; } /* necessary for float drop and to stack the s */ .nav ul li { clear:left; } /* must clear the floated list item inside sublist */ .nav a { position:relative; display:block; } /* needs to have a position, to be above the rest */ .nav a.main { float:left; /* necessary for float drop */ margin-top:10000px; } /* bring the top level links back into view */ .nav .drop, .nav .fly { margin-top:-10000px; } /* hide the sub links and their containers, opera has low upper limits */ .nav ul { margin-bottom:-5000px; } /* avoid any interaction between the subs, can be any large size */ /* The bit that does ALL the work to bring the sub menus into view */.nav a:hover, .nav a:focus, .nav a:active { margin-right:0; z-index:10; outline:0; } .nav a:hover b, .nav a:focus b, .nav a:active b { color:#000; cursor:pointer; } /* this is for keyboard tabbing color change */ /* OPERA fix */ .nav ul:hover, .nav ul ul:hover { clear:left; } /* to stop intermittent sub link :hover problems *//* ---------------------------------------------------------------------------- */ /* bug fixes for IE7 and lower - DO NOT CHANGE */ .nav .fly {width:99%;} /* make each flyout 99% of the prevous level */ a:active {} /* requires a blank style for :active to stop it being buggy */
html代码：
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