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大家，我还是 HTML5 和 CSS3 的初学者

我的导航栏有问题，当我悬停时，导致底部段落轻微移动。知道如何解决它或发生了什么吗？

这是HTML代码：

<!DOCTYPE html>
<html>

<head>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
<title>HTML5, CSS3 and jQuery Navigation menu</title>
<link rel="stylesheet" href="css/nav.css">
<!--[if IE]>
  <script src="html5.js"></script>
<![endif]-->
</head>

<body class="no-js">
  <nav id="topNav">
        <ul>
            <li><a href="#" title="Nav Link 1">HOME</a></li>
           <li><a href="#" title="Nav Link 1">SERVICES</a>
                <ul>
                    <li><a href="#" title="Sub Nav Link 1">Sub Nav Link 1</a></li>
                    <li><a href="#" title="Sub Nav Link 2">Sub Nav Link 2</a></li>
                    <li><a href="#" title="Sub Nav Link 3">Sub Nav Link 3</a></li>
                    <li><a href="#" title="Sub Nav Link 4">Sub Nav Link 4</a></li>
                    <li class="last"><a href="#" title="Sub Nav Link 5">Sub Nav Link 5</a></li>
                </ul>        
              </li>
            <li><a href="#" title="Nav Link 1">ABOUT US</a></li>
            <li class="last"><a href="#" title="Nav Link 1">ENQUITIES</a></li>
        </ul>
  </nav>      
    <p>"Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."<p>
  <script src="js/jquery.js"></script>
  <script src="js/modernizr.js"></script>
</body>

</html>

这是CSS

/* JS disabled styles */
.no-js nav li:hover ul { display:block; }

/* base nav styles */
nav {
  margin: 0 auto 20px;
  position: relative;
  background-color: #FFFFFF;
  font: 16px Tahoma, Sans-serif;
}
nav ul { padding:0; margin:0; }
nav li { position:relative; float:left; list-style-type:none; }
nav ul:after { content:"."; display:block; height:0; clear:both; visibility:hidden; }

nav ul a:hover { color: #F90; border-bottom: thin; border-bottom-style:solid;}

nav li a {
  display: block;
  padding: 10px 20px;
  color: #333;
  text-decoration: none;
  font-weight: 600;
}
nav li a:focus { outline:none; text-decoration:underline; }
nav li:first-child a { border-left:none; }
nav li.last a { border-right:none; }
nav a span { display:block; float:right; margin-left:5px; }
nav ul ul { display:none; width:110%; position:absolute; left:0; background:#FFFFFF; }
nav ul ul li { float:none; }
nav ul ul a { padding:5px 10px; border-left:none; border-right:none; font-size:14px; }
nav ul ul a:hover { color: #F90; }

/* CSS3 */

.cssgradients nav li:hover { background-image:-moz-linear-gradient(0% 100px 90deg, #999, #222); background-image:-webkit-gradient(linear, 0% 0%, 0% 100%, from(#222), to(#555)); }
.borderradius nav ul ul { -moz-border-radius-bottomleft:4px; -moz-border-radius-bottomright:4px; -webkit-border-bottom-left-radius:4px; -webkit-border-bottom-right-radius:4px; border-bottom-left-radius:4px; border-bottom-right-radius:4px; }
.boxshadow.rgba nav ul ul { background-color:rgba(0,0,0,0.8); -moz-box-shadow:2px 2px 2px rgba(0,0,0,.8); -webkit-box-shadow:2px 2px 2px rgba(0,0,0,.8); box-shadow:2px 2px 2px rgba(0,0,0,.8); }
.rgba nav ul ul li { border-left:1px solid rgba(0,0,0,0.1); border-right:1px solid rgba(0,0,0,0.1); }
.rgba nav ul ul a:hover { background-color:rgba(85,85,85,.9); }
.borderradius.rgba nav ul ul li.last { border-left:1px solid rgba(0,0,0,0.1); border-bottom:1px solid rgba(0,0,0,0.1); -moz-border-radius-bottomleft:4px; -moz-border-radius-bottomright:4px; -webkit-border-bottom-left-radius:4px; -webkit-border-bottom-right-radius:4px; border-bottom-left-radius:4px; border-bottom-right-radius:4px; }
.csstransforms ul a span { -moz-transform:rotate(-180deg);-webkit-transform:rotate(-180deg); }

实际上，我正在使用它的教程并尝试转换我自己的想法。任何人，请。谢谢。

4

2 回答 2

3

添加以下 CSS 行：

nav ul a { 
   border-bottom: thin; border-bottom-style: solid; border-bottom-color: transparent;
}
于 2012-07-21T04:06:08.967 回答
2

问题是当您将鼠标悬停在导航项目的底部时，您正在添加一个 1px 的边框。你在这条线上这样做：

nav ul a:hover { color: #F90; border-bottom: thin; border-bottom-style:solid;}

在悬停之前，所有导航项都没有边框。悬停时，会创建一个边框，将段落向下移动 1px（边框的大小）。因此，您可以border-bottom为所有导航项设置一个。如果您不希望显示该边框，可以使用border-color: transparent.

于 2012-07-21T04:12:56.123 回答