Question

每个人，我仍然是HTML5和CSS3的初学者

导航栏出现问题导致底部段落在我悬停时略微移动。知道如何解决它或发生了什么？

以下是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，我正在使用它上面的教程并尝试转换我自己的想法。请问任何人。谢谢。

Answer 1

添加以下CSS行：

nav ul a { 
   border-bottom: thin; border-bottom-style: solid; border-bottom-color: transparent;
}

Answer 2

问题是，当您将鼠标悬停在导航项目的底部时，您会在其底部添加1px边框。你在这一行上这样做了：

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

在悬停之前，没有任何导航项具有边框。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，您可以为所有导航项设置border-bottom。如果您不希望显示该边框，则可以使用border-color: transparent。

HTML5 + CSS3下拉导航栏

2 个答案: