本文執行個體講述了JS+CSS相對定位實現的下拉式功能表。分享給大家供大家參考。具體如下：
這裡使用的是相對定位，不過效果還可以，用時候再修整一下，這個只是實現了大概功能，還有許多細節沒有修飾。
運行效果截圖如下：
線上示範地址如下：
http://demo.jb51.net/js/2015/js-css-ab-fix-menu-codes/
具體代碼如下：
<html><head><title>非定位CSS+Js下拉式功能表</title><style>#menu { position: absolute; font-family: sans-serif; font-size: 9pt;}#menu li { float: left; list-style-type: none; width: 102px; background-color: skyblue; border: 1px solid #0066cc; text-indent: 0px; margin-left: 3px;}#menu li a { color: blue; text-decoration: none; width: 100%; display: block;}#menu li a:hover { color: white;}#menu li ul { background-color: skyblue; margin: 0px; padding: 0px;}#menu li ul li { padding: 0px; margin: 0px; float: none; list-style-type: none; width: 100px; text-indent: 0px; border: none;}#menu li ul li a{ color: black; text-decoration: none;}#menu li ul li a:hover{ color: black; background-color: aqua;}</style><script language="javascript" type="text/javascript">var t=false,current;function SetupMenu() { if (!document.getElementsByTagName) return; items=document.getElementsByTagName("li"); for (i=0; i<items.length; i++) { if (items[i].className != "menu") continue; thelink=findChild(items[i],"A"); thelink.onmouseover=ShowMenu; thelink.onmouseout=StartTimer; if (ul=findChild(items[i],"UL")) { ul.style.display="none"; for (j=0; j<ul.childNodes.length; j++) { ul.childNodes[j].onmouseover=ResetTimer; ul.childNodes[j].onmouseout=StartTimer; } } } }function findChild(obj,tag) { cn = obj.childNodes; for (k=0; k<cn.length; k++) { if (cn[k].nodeName==tag) return cn[k]; } return false;}function ShowMenu(e) { if (!e) var e = window.event; thislink = (e.target) ? e.target: e.srcElement; ResetTimer(); if (current) HideMenu(current); thislink = thislink.parentNode; current=thislink; ul = findChild(thislink,"UL"); if (!ul) return; ul.style.display="block";}function HideMenu(thelink) { ul = findChild(thelink,"UL"); if (!ul) return; ul.style.display="none";}function ResetTimer() { if (t) window.clearTimeout(t);}function StartTimer() { t = window.setTimeout("HideMenu(current)",200);}window.onload=SetupMenu;</script></head><body><h1>Menu Test</h1><ul id="menu"><li class="menu"><a href="#">Home</a></li><li class="menu"><a href="#">Products</a> <ul> <li><a href="#">Sub-item 1</a></li> <li><a href="#">Sub-item 2</a></li> </ul></li><li class="menu"><a href="#">Support</a> <ul> <li><a href="#">Sub-item 1</a></li> <li><a href="#">Sub-item 2</a></li> </ul></li><li class="menu"><a href="#">Employment</a> <ul> <li><a href="#">Sub-item 1</a></li> <li><a href="#">Sub-item 2</a></li> </ul></li><li class="menu"><a href="#">Contact Us</a> <ul> <li><a href="#">Sub-item 1</a></li> <li><a href="#">Sub-item 2</a></li> </ul></li></ul></body></html>
希望本文所述對大家的JavaScript程式設計有所協助。
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