学习教程后我建立了一个导航栏
来自网站并遵循一些演示示例。现在我
我坚持一件事，以下是我的代码
导航栏，并且代码工作正常，除非
鼠标被带到其中一个有子的酒吧
菜单。这样做时，它会给出闪烁的图像
整个导航栏没有它应该的结果
给。请帮助我并指出我在哪里
犯错了吗？
这是我的导航栏的 HTML 代码
使用：
<nav>
<ul>
<li><a href="#">Home</a></li>
<li><a href="#">Tutorials</a>
<ul>
<li><a href="#">Photoshop</a></li>
<li><a href="#">Illustrator</a></li>
<li><a href="#">Web Design</a></li>
</ul>
</li>
<li><a href="#">Articles</a>
<ul>
<li><a href="#">Web Design</a></li>
<li><a href="#">User Experience</a>
<ul>
<li><a href="#">Services</a></li>
<li><a href="#">Cloud Computing</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#">Inspiration</a></li>
</ul>
</nav>
以下的样式表是这样的：
nav ul ul {
display: none; /*hides the unordered list inside the unordered list */
}
nav ul li:hover > ul { /*the > child selector makes sure only the child ul of the li being hovered is targeted, rather than all sub menus appearing at once.*/
display: block; /*displays the hidden list when mouse is brought over it */
}
nav ul{
/* Affects the UL element */
overflow: hidden;
display: inline-block;
}
nav ul li{
/* Specifying a fallback color and we define
CSS3 gradients for the major browsers: */
background-color: #f0f0f0;
background-image: -webkit-gradient(linear,left top, left bottom,from(#fefefe), color-stop(0.5,#f0f0f0),color-stop(0.51, #e6e6e6));
background-image: -moz-linear-gradient(#fefefe 0%, #f0f0f0 50%, #e6e6e6 51%);
background-image: -o-linear-gradient(#fefefe 0%,#f0f0f0 50%, #e6e6e6 51%);
background-image: -ms-linear-gradient(#fefefe 0%, #f0f0f0 50%, #e6e6e6 51%);
background-image: linear-gradient(#fefefe 0%, #f0f0f0 50%, #e6e6e6 51%);
border-right: 1px solid rgba(9, 9, 9, 0.125);
/* Adding a 1px inset highlight for a more polished efect: */
box-shadow: 1px -1px 0 rgba(255, 255, 255, 0.6) inset;
-moz-box-shadow: 1px -1px 0 rgba(255, 255, 255,0.6) inset;
-webkit-box-shadow: 1px -1px 0 rgba(255, 255, 255, 0.6) inset;
position:relative;
float: left;
list-style: none;
}
nav ul li:after{
/* This creates a pseudo element inslide each LI */
content:'.';
text-indent:-9999px;
overflow:hidden;
position:absolute;
width:100%;
height:100%;
top:0;
left:0;
z-index:1;
opacity:0;
/* Gradients! */
background-image:-webkit-gradient(linear, left top, right top, from(rgba(168,168,168,0.5)),color-stop(0.5,rgba(168,168,168,0)), to(rgba(168,168,168,0.5)));
background-image:-moz-linear-gradient(left, rgba(168,168,168,0.5), rgba(168,168,168,0) 50%, rgba(168,168,168,0.5));
background-image:-o-linear-gradient(left, rgba(168,168,168,0.5), rgba(168,168,168,0) 50%, rgba(168,168,168,0.5));
background-image:-ms-linear-gradient(left, rgba(168,168,168,0.5), rgba(168,168,168,0) 50%, rgba(168,168,168,0.5));
background-image:linear-gradient(left, rgba(168,168,168,0.5), rgba(168,168,168,0) 50%, rgba(168,168,168,0.5));
/* Creating borders with box-shadow. Useful, as they don't affect the size of the element. */
box-shadow:-1px 0 0 #a3a3a3,-2px 0 0 #fff,1px 0 0 #a3a3a3,2px 0 0 #fff;
-moz-box-shadow:-1px 0 0 #a3a3a3,-2px 0 0 #fff,1px 0 0 #a3a3a3,2px 0 0 #fff;
-webkit-box-shadow:-1px 0 0 #a3a3a3,-2px 0 0 #fff,1px 0 0 #a3a3a3,2px 0 0 #fff;
/* This will create a smooth transition for the opacity property */
-moz-transition:0.25s all;
-webkit-transition:0.25s all;
-o-transition:0.25s all;
transition:0.25s all;
}
/* Treating the first LI and li:after elements separately */
nav ul li:first-child{
border-radius: 4px 0 0 4px;
}
nav ul li:first-child:after,
nav ul li.selected:first-child:after{
box-shadow:1px 0 0 #a3a3a3,2px 0 0 #fff;
-moz-box-shadow:1px 0 0 #a3a3a3,2px 0 0 #fff;
-webkit-box-shadow:1px 0 0 #a3a3a3,2px 0 0 #fff;
border-radius:4px 0 0 4px;
}
nav ul li:last-child{
border-radius: 0 4px 4px 0;
}
/* Treating the last LI and li:after elements separately */
nav ul li:last-child:after,
nav ul li.selected:last-child:after{
box-shadow:-1px 0 0 #a3a3a3,-2px 0 0 #fff;
-moz-box-shadow:-1px 0 0 #a3a3a3,-2px 0 0 #fff;
-webkit-box-shadow:-1px 0 0 #a3a3a3,-2px 0 0
#fff;
border-radius:0 4px 4px 0;
}
nav ul li:hover:after,
nav ul li.selected:after,
nav ul li:target:after{
/* This property triggers the CSS3 transition */
opacity:1;
}
nav ul:hover li.selected:after,
nav ul:hover li:target:after{
/* Hides the targeted li when we are hovering on the UL */
opacity:0;
}
nav ul li.selected:hover:after,
nav ul li:target:hover:after{
opacity:1 !important;
}
/* Styling the anchor elements */
nav ul li a{
color: #5d5d5d;
display: inline-block;
font: 20px/1 Lobster,Arial,sans-serif;
padding: 12px 35px 14px;
position: relative;
text-shadow: 1px 1px 0 rgba(255, 255, 255, 0.6);
z-index:2;
text-decoration:none !important;
white-space:nowrap;
}
nav{
display: block;
margin: 300px auto 0;
text-align: center;
width: 600px;
}
a, a:visited {
text-decoration:none;
outline:none;
color:#54a6de;
}
a:hover{
text-decoration:underline;
}