如何在结构为<ul> <li>的菜单之间添加分隔符

Question

我正在这个网站上工作,我需要制作导航菜单,当你将鼠标悬停在它们上面时会扩展,并且它们有白色垂直条,可以分隔条目.一直到右边都是搜索的能力.

该网站是:http://www.problemio.com,我正在谈论屏幕顶部附近有背景图片的项目,其中包含"问题支持"

我有这个div的html:

<div class="nav_bar">
<!-- connect buttons and menu go here -->
    <div class="nav">
        <div class="icons">

        </div>

        <div class="menusystem" id="site_nav">
            <ul class="main_menu_ul">
                <li class="main_menu_li"><a href="http://www.problemio.com/">Support</a>
                </li>

                <li class="main_menu_li"><a href="http://www.problemio.com/">Problems</a> 
                    <ul class="child_menu_ul">
                        <li class="first"><a href="http://www.problemio.com/">Categories</a></li>
                    </ul>
                </li>
            </ul>

            <form  name="form" method="post">
            Search: <input type="text" size="20"></input> 
            <input type="submit" class="button" value="Search"></input>         

    </div>
</div>

我有这个用于nav_bar的CSS

.nav_bar
{
    background-image: url('http://www.problemio.com/img/ui/problemiomainbluebar.png');
    background-repeat: repeat-x;

    border-bottom: 1px solid #462c1f;
    border-top: 1px solid #462c1f;   

        margin-top: 5px;
}

/* styles for nav_bar: */ 
.nav_bar a
{
    z-index: 20;
    width:100%;
/*  background:#ffce2e; the comehike strip with orange */
/*  background:#2e6ea4; the comehike strip with blue  */

    color: white;   

    position: relative;
}

.nav_bar .nav 
{
    width:60em;
    height: 40px;
    margin: 0 auto;
    position: relative;
    z-index: 20;

}

.nav_bar .icons 
{
    position: absolute;
    left: 0;
    display: inline-block;
}

.nav_bar .icons div 
{
    display: inline-block;
    position: relative; 
    top: 10px;
    float:left;
}

.nav_bar .nav #site_nav 
{
    position: absolute;
    right: 0.5em;
    top: 0.2em;
    z-index: 20;
}

这个css用于

构成下拉列表的部分:

.menusystem 
{
    position: absolute;
    font-size: 1em;
}

.menusystem ul, .menusystem li 
{
    margin: 0;
    padding: 0;
}
.menusystem li 
{
    list-style: none outside none;
}

.menusystem ul 
{
    list-style: none;
/*
    -moz-border-radius: 14px;
    -webkit-border-radius: 14px;
*/

}

.menusystem ul li 
{
    position: relative;
/*
    -moz-box-shadow: 2px 2px 4px rgba(0,0,0,0.4);
    -webkit-box-shadow: 2px 2px 4px rgba(0,0,0,0.4);
    -moz-border-radius: 14px;
    -webkit-border-radius: 14px;
*/
}

.menusystem ul li ul 
{
    display: none;
    position: absolute;
    top: 1.6em;
    right: 0;
    width: 10em;    
}

.menusystem li a {
    display: block;
    padding: 5px 10px;
     /* dark blue */
/*  border: 1px solid #2e6ea4; */
    text-decoration: none;
}

.menusystem ul li.main_menu_li {
    float:right;
    width: 10em;
    margin-right:0.2em;
    text-align: center;
}

/* IE-Win (Holly hack) reads the list item line breaks, so lets hide those \*/
* html ul li { float: left; }
* html ul li a { height: 1%; }


.menusystem li:hover ul, .menusystem li.mouseHover ul { 
    display: block;
}

.menusystem li ul.child_menu_ul li a
{
    /*
    color: #fff;
    */
    color: #fff;
    /* light blue */
/*  background: #7ba9c9;  */

        font-size: 80%;
    text-shadow: none;
    -moz-border-radius: 0px;
    -webkit-border-radius: 0px;
    border-bottom: 1px solid #2e6ea4;
    border-top: 0px;
    background: none repeat scroll 0 0 #2E6EA4;
}
.menusystem li ul.child_menu_ul li.first a
{
    -moz-border-radius-topleft: 14px;
    -moz-border-radius-topright: 14px;
    -webkit-border-top-left-radius: 14px;
    -webkit-border-top-right-radius: 14px;
    -moz-border-radius-bottomleft: 0;
    -moz-border-radius-bottomright: 0;
    -webkit-border-bottom-left-radius: 0;
    -webkit-border-bottom-right-radius: 0;
    border-top: 1px solid #2e6ea4;
}

.menusystem li ul.child_menu_ul li.last a
{
    -moz-border-radius-topleft: 0px;
    -moz-border-radius-topright: 0px;
    -webkit-border-top-left-radius: 0px;
    -webkit-border-top-right-radius: 0px;
        -moz-border-radius-bottomleft: 14px;
    -moz-border-radius-bottomright: 14px;
    -webkit-border-bottom-left-radius: 14px;
    -webkit-border-bottom-right-radius: 14px;
}

.menusystem li ul.child_menu_ul li.only a 
{
    -moz-border-radius: 14px;
    -webkit-border-radius: 14px;

}

.menusystem li ul.child_menu_ul li a:hover {
    color: #ff0;
    background: #2e6ea4; 
}

/*.menusystem li.main_menu_li a */
.menusystem ul.child_menu_ul a
{
    color: #fff;
/*
    background: -moz-linear-gradient(100% 100% 90deg, #668eb8, #2e6ea4 );
    background: -webkit-gradient(linear, 0% 0%, 0% 100%, from(#668eb8), to(#2e6ea4));
*/

    text-shadow: 1px 1px 1px rgba(0,0,0,0.9);
    /*
    -moz-text-shadow: 1px 1px 1px rgba(0,0,0,0.9);
    -webkit-text-shadow: 1px 1px 1px rgba(0,0,0,0.9);
    -moz-border-radius: 14px;
    -webkit-border-radius: 14px;
*/
}

.menusystem li.main_menu_li a:hover 
{
/*      background-color: #2e6ea4; */
    color: #ff0;
}

ul li.spaced
{   
    padding-bottom: 10px; 
    font-weight: normal;    
}

Answer 1

为什么不是简单的边框？

#site_nav>ul>li+li {
    border-left: solid 2px white;
}

这增加了一个2px的厚的白色边框任何左边li紧接其后的li(所以,不是第一次)立即里面ul立即里面#site_nav.