当我尝试切换 SubMenu 项目时，该项目会切换，但第一级菜单已关闭。当用户单击子菜单项时，菜单不应隐藏。例如，如果您单击 SSNIT 并转到“核心服务”，则会出现子菜单，但第一级菜单项已关闭。需要一些专业知识来进行此修复？您可以在此处http://jsfiddle.net/3aRSr/查看 JSFiddle 上的代码。
HTML：
<div id="container">
<div style="display: inline-block">
<ul id="menu">
<li><a href="">Home</a></li>
<li>
<a href="#">SSNIT</a>
<ul>
<li>
<a href="">About SSNIT</a>
</li>
<li>
<a href="/Pages/new-ssnit.aspx">New SSNIT</a>
</li>
<li>
<a href="">Board of Trustees</a>
</li>
<li>
<a href="#">Core Services</a>
<ul>
<li><a href="/">Membership</a></li>
<li><a href="/">Investments</a></li>
<li><a href="/">Benefits</a></li>
<li><a href="/x">Students Loan</a></li>
</ul>
</li>
<li>
<a href="/">Executive Committee</a>
</li>
<li>
<a href="">Mission and Vision</a>
</li>
</ul>
</li>
<li><a href="">Statistics</a></li>
<li><a href="">News</a></li>
<li><a href="">Resources</a></li>
<li>
<a href="#">Self Services</a>
<ul>
<li>
<a href="#">Benefit Application</a>
</li>
<li>
<a href="#">Employer Enrolment</a>
</li>
<li>
<a href="#">Member Enrolment</a>
</li>
</ul>
</li>
<li><a href="">FAQs</a></li>
<li>
<a href="#">Contact Us</a>
<ul>
<li>
<a href="/">Contact Information</a>
</li>
<li>
<a href="/">Customer Service Locations</a>
</li>
<li>
<a href="/">Telephone Directory</a>
</li>
<li>
<a href="/">SSNIT Locations Map</a>
</li>
</ul>
</li>
</ul>
</div>
CSS：
#menu, #menu2, #container {
width: 100%;
margin: 0;
padding: 1px 0 0 0;
list-style: none;
background: #DCDCDC;
}
#menu li, #menu2 li {
float: left;
padding: 0 0 0 0;
position: relative;
line-height: 0;
}
#menu a, #menu2 a {
float: left;
height: 25px;
padding-top: 0;
padding-bottom: 0;
padding-left: 10px;
padding-right: 10px;
color: #403E3F;
text-transform: uppercase;
font: bold 12px/25px Arial, Helvetica;
text-decoration: none;
}
#menu li:hover > a, #menu2 li:hover > a {
color: #fafafa;
}
#menu li a:hover, #menu2 li a:hover /* IE6 */ {
color: #fafafa;
}
#menu li:hover > ul, #menu2 li:hover > ul {
/*display: block;*/
}
/* Sub-menu */
#menu ul, #menu2 ul {
list-style: none;
margin: 0;
padding: 0;
display: none;
position: absolute;
top: 40px; /* louis: 50px */
left: 0;
z-index: 99999;
background: #DCDCDC;
}
#menu ul ul, #menu2 ul ul {
top: 0px;
left: 195px; /* louis: 160px */
}
#menu ul li, #menu2 ul li {
float: none;
margin: 0;
padding: 0;
display: block;
-moz-box-shadow: 0 1px 0 #111111, 0 2px 0 #777777;
-webkit-box-shadow: 0 1px 0 #111111, 0 2px 0 #777777;
box-shadow: 0 1px 0 #111111, 0 2px 0 #777777;
}
#menu ul li:last-child, #menu2 ul li:last-child {
-moz-box-shadow: none;
-webkit-box-shadow: none;
box-shadow: none;
}
#menu ul a, #menu2 ul a {
padding: 10px;
height: 10px;
width: 165px;
height: auto;
line-height: 1;
display: block;
white-space: nowrap;
float: none;
text-transform: none;
}
#menu ul a, #menu2 ul a /* IE6 */ {
height: 10px;
}
*:first-child + html #menu ul a, *:first-child + html #menu2 ul a /* IE7 */ {
height: 10px;
}
#menu ul a:hover, #menu2 ul a:hover {
background: #0186ba;
}
#menu ul li:first-child > a, #menu2 ul li:first-child > a {
}
#menu ul li:first-child > a:after, #menu2 ul li:first-child > a:after {
content: '';
position: absolute;
left: 30px;
top: -10px;
width: 0;
height: 0;
border-left: 12px solid transparent;
border-right: 12px solid transparent;
border-bottom: 16px solid #DCDCDC;
}
#menu ul ul li:first-child a:after, #menu2 ul ul li:first-child a:after {
left: -10px;
top: 5px;
width: 0;
height: 0;
border-left: 0;
border-bottom: 12px solid transparent;
border-top: 12px solid transparent;
border-right: 16px solid #DCDCDC;
}
#menu ul li:first-child a:hover:after, #menu2 ul li:first-child a:hover:after {
border-bottom-color: #0186ba;
}
#menu ul ul li:first-child a:hover:after, #menu2 ul ul li:first-child a:hover:after {
border-right-color: #0186ba;
border-bottom-color: transparent;
}
#menu ul li:last-child > a, #menu2 ul li:last-child > a {
}
Clear floated elements #menu:after, #menu2:after {
visibility: hidden;
display: block;
font-size: 0;
content: " ";
clear: both;
height: 0;
}
* html #menu, * html #menu2 {
zoom: 1;
}
IE6 *:first-child + html #menu, *:first-child + html #menu2 {
zoom: 1;
}
JavaScript：
$(document).ready(function () {
$("#menu ul li, #menu > li ul li").click(function () {
//mouse click toggle menu items
$('>ul').toggle(
// mouseover
function () {
$(this).find('>ul').fadeIn('slow');
});
});
});