当用户的鼠标经过主菜单时，会自动弹出二级导航菜单效果，setTimeout综合应用实例特效，完全支持自定义。
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<title>鼠标经过弹出js二级导航菜单_武鸣人</title>
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<style>
body,div,ul,li,p{margin:0;padding:0;}
body{font:12px/1.5 Arial;}
ul{list-style-type:none;}
#nav,#nav ul,#nav ul li,#nav ul li a:hover,#nav .nav_www_wuming_ren,#nav .nav_www_wuming_ren p,#nav .nav_www_wuming_ren p span,#nav .nav_www_wuming_ren .arrow_wuming_ren{background:url(/img/20240224_www_wuming_ren_2.png) no-repeat;}
#nav{position:relative;width:910px;background-position:0 -36px;margin:10px auto;}
#nav ul{height:36px;line-height:36px;margin-left:10px;padding-right:10px;overflow:hidden;background-position:right -72px;}
#nav ul li{float:left;width:110px;margin-left:-2px;background-position:0 -108px;}
#nav ul li a{font-size:14px;color:#fff;width:102px;display:block;text-align:center;text-decoration:none;margin:0 2px 0 4px;}
#nav ul li a:hover{font-weight:700;background-position:-3px -144px;}
#nav .nav_www_wuming_ren{display:none;position:absolute;top:41px;width:auto!important;min-width:110px;height:27px;line-height:27px;white-space:nowrap;background-position:0 -180px;}
#nav .nav_www_wuming_ren p{margin-left:10px;padding-right:10px;background-position:right -234px;}
#nav .nav_www_wuming_ren p span{display:block;color:#235e99;background-repeat:repeat-x;background-position:0 -207px;}
#nav .nav_www_wuming_ren p a{font-size:12px;display:inline;color:#235e99;text-decoration:none;margin:0 5px;padding:0 2px;}
#nav .nav_www_wuming_ren p a:hover{font-weight:400;background-image:none;border-bottom:2px solid;}
#nav .nav_www_wuming_ren .arrow_wuming_ren{position:absolute;top:-4px;display:block;width:11px;height:5px;background-position:0 -261px;}
</style>
<script type="text/javascript">
var get = {
byId: function(id) {
return document.getElementById(id)
},
byClass: function(sClass, oParent) {
var aClass = [];
var reClass = new RegExp("(^| )" + sClass + "( |$)");
var aElem = this.byTagName("*", oParent);
for (var i = 0; i < aElem.length; i++) reClass.test(aElem[i].className) && aClass.push(aElem[i]);
return aClass
},
byTagName: function(elem, obj) {
return (obj || document).getElementsByTagName(elem)
}
};//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
window.onload = function ()
{
var oNav = get.byId("nav");
var aLi = get.byTagName("li", oNav);
var aSubNav = get.byClass("nav_www_wuming_ren", oNav);
var oSubNav = oEm = timer = null;
var i = 0;
for (i = 1; i < aLi.length; i++)
{
aLi[i].onmouseover = function ()
{
//隐藏所有子菜单
for (i = 0; i < aSubNav.length; i++)aSubNav[i].style.display = "none";
//获取该项下的子菜单
oSubNav = get.byClass("nav_www_wuming_ren", this)[0];
//获取该项下的指示箭头
oEm = get.byTagName("em", this)[0];
//显示该项下的子菜单
oSubNav.style.display = "block";
//判断显示区域
oNav.offsetWidth - this.offsetLeft > oSubNav.offsetWidth ?
//如果在显示范围居左显示
oSubNav.style.left = this.offsetLeft + "px" :
//超出显示范围居右显示
oSubNav.style.right = 0;
//计算指标箭头显示位置
oEm.style.left = this.offsetLeft - oSubNav.offsetLeft + 50 + "px";
clearTimeout(timer);
//阻止事件冒泡
oSubNav.onmouseover = function (event)
{
(event || window.event).cancelBubble = true;
clearTimeout(timer)
}
};
aLi[i].onmouseout = function ()
{
timer = setTimeout(function () {
oSubNav.style.display = "none"
},300)
}
}
};//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
</script>
</head>
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