CSS下拉菜单+ FLAT UI

http://designmodo.github.io/Flat-UI/CSS下拉菜单+ FLAT UI

我想创造一个CSS下拉菜单中，我有下拉部分完成的，但是我似乎无法效仿的过渡，而且不知道如何编写代码那些。这是我迄今为止，预先感谢您的帮助。

body { 
font-family: 'Lucida Grande', 'Helvetica Neue', Helvetica, Arial, sans-serif; 
padding: 20px 50px 150px; 
font-size: 13px; 
text-align: center; 
background: #E3CAA1;

}

ul { 
text-align: left; 
    display: inline; 
    margin: 0; 
    padding: 15px 4px 17px 0; 
    list-style: none; 
    -webkit-box-shadow: 0 0 5px rgba(0, 0, 0, 0.15); 
    -moz-box-shadow: 0 0 5px rgba(0, 0, 0, 0.15); 
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.15); 
    } 
    ul li { 
    font: bold 12px/18px sans-serif; 
    display: inline-block; 
    margin-right: -4px; 
    position: relative; 
    padding: 15px 20px; 
    background: #fff; 
    cursor: pointer; 
    -webkit-transition: all 0.2s; 
    -moz-transition: all 0.2s; 
    -ms-transition: all 0.2s; 
    -o-transition: all 0.2s; 
    transition: all 0.2s; 
    } 
    ul li:hover { 
    background: #555; 
    color: #fff; 
    } 
    ul li ul { 
    padding: 0; 
    position: absolute; 
    top: 48px; 
    left: 0; 
    width: 150px; 
    -webkit-box-shadow: none; 
    -moz-box-shadow: none; 
    box-shadow: none; 
    display: none; 
    opacity: 0; 
    visibility: hidden; 
    -webkit-transiton: opacity 0.2s; 
    -moz-transition: opacity 0.2s; 
    -ms-transition: opacity 0.2s; 
    -o-transition: opacity 0.2s; 
    -transition: opacity 0.2s; 
} 
ul li ul li { 
    background: #555; 
    display: block; 
    color: #fff; 
    text-shadow: 0 -1px 0 #000; 
} 
ul li ul li:hover { background: #666; } 
ul li:hover ul { 
    display: block; 
    opacity: 1; 
    visibility: visible; 
}

来源

2014-01-06 user3164036

的转变发生通过转换从0不透明度为1，但如果你正在使用平板的用户界面，是不是已经配备了内置的下拉列表？你不应该写这么多的自定义代码。 –

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title>Untitled Document</title> 
<style type="text/css"> 
body { 
font-family: 'Lucida Grande', 'Helvetica Neue', Helvetica, Arial, sans-serif; 
padding: 20px 50px 150px; 
font-size: 13px; 
text-align: center; 
background: #E3CAA1;} 
ul { 
text-align: left; 
    display: inline; 
    margin: 0; 
    padding: 15px 4px 17px 0; 
    list-style: none; 
    -webkit-box-shadow: 0 0 5px rgba(0, 0, 0, 0.15); 
    -moz-box-shadow: 0 0 5px rgba(0, 0, 0, 0.15); 
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.15); 
    } 
    ul li { 
    font: bold 12px/18px sans-serif; 
    display: inline-block; 
    margin-right: -4px; 
    position: relative; 
    padding: 15px 20px; 
    background: #fff; 
    cursor: pointer; 
    -webkit-transition: all 0.2s; 
    -moz-transition: all 0.2s; 
    -ms-transition: all 0.2s; 
    -o-transition: all 0.2s; 
    transition: all 0.2s; 
    } 
    ul li:hover { 
    background: #555; 
    color: #fff; 
    } 
    ul li ul { 
    padding: 0; 
    position: absolute; 
    top: 48px; 
    left: 0; 
    width: 150px; 
    -webkit-box-shadow: none; 
    -moz-box-shadow: none; 
    box-shadow: none; 
    display: none; 
    opacity: 0; 
    visibility: hidden; 
    -webkit-transiton: opacity 0.2s; 
    -moz-transition: opacity 0.2s; 
    -ms-transition: opacity 0.2s; 
    -o-transition: opacity 0.2s; 
    -transition: opacity 0.2s; 
} 
ul li ul li { 
    background: #555; 
    display: block; 
    color: #fff; 
    text-shadow: 0 -1px 0 #000; 
} 
ul li ul li:hover { background: #666; } 
ul li:hover ul { 
    display: block; 
    opacity: 1; 
    visibility: visible; 
} 
</style> 
</head> 
<body> 

<ul> 
<li>Dropdown menu items</li> 
<li>Dropdown menu items</li> 
<li>Dropdown menu items 
<ul> 
<li>Drop - Dropdown menu items</li> 
<li>Drop - Dropdown menu items</li> 
<li>Drop - Dropdown menu items</li> 
<li>Drop - Dropdown menu items</li> 
</ul> 
</li> 
<li>Dropdown menu items</li> 
<li>Dropdown menu items</li> 
</ul> 

</body> 
</html>

来源

2014-01-06 04:06:49

解释你改变了什么以及为什么会更有帮助。一个工作示例的链接也很有用。 90行未注释的代码没有提供非常明确的答案。 –

CSS下拉菜单+ FLAT UI

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