CSS ???? ??
CSS ???? ??
CSS? ???? ???? ?? ??? ? ???? ??? ???? ??? ??????.
?? ???? ??
??? ?? ?? ???? ??? ???? ??? ?????.
Example
<!DOCTYPE html>
<html>
<head>
<title> PHP中文網(wǎng)（php.cn）</title>
<meta charset="utf-8">
<style>
.dropdown {
position: relative;
display: inline-block;
}
.dropdown-content {
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgb(83, 251, 185);
padding: 12px 16px;
}
.dropdown:hover .dropdown-content {
display: block;
}
</style>
</head>
<body>
<div class="dropdown">
<span>鼠標移動到我這！</span>
<div class="dropdown-content">
<p> PHP中文網(wǎng)（php.cn）</p>
<p>ipnx.cn</p>
</div>
</div>
</body>
</html>????? ???? ??? ???
?? ??
HTML ??:
?? HTM ??? ???? ??? ?? ???? ??? ? ? ????. ??
???? ??(?: <div>)? ???? ???? ??? ???? ??? ??? ?? ?????.
<div> ??? ???? ??? ??? ???? CSS? ???? ???? ???? ???? ?????.
CSS ??:
.dropdown ???? position:relative? ???? ???? ??? ??? ???? ??? ??? ??? ????? ?????(position:absolute ??).
.dropdown-content ???? ?? ???? ?????. ????? ??? ??? ???? ??? ??? ??? ?? ?????. ?? ?? ?? 160px? ???? ????. ????? ??? ? ????. ??: ???? ???? ???? ??? ??? ????? ????? ??? 100%? ???? ???(overflow:auto ??? ?? ???? ???? ? ??).
box-shadow ??? ???? ???? ??? "??"?? ??? ????.
:?? ???? ???? ???? ?? ?? ???? ??? ? ???? ??? ???? ? ?????.
???? ??
???? ??? ??? ???? ???? ??? ??? ? ??? ????. ???? ??? ??? ???? ???? ??????.
<!DOCTYPE html>
<html>
<head>
<title>PHP中文網(wǎng)(php.cn)</title>
<meta charset="utf-8">
<style>
.dropbtn {
background-color: #4CAF50;
color: white;
padding: 16px;
font-size: 16px;
border: none;
cursor: pointer;
}
.dropdown {
position: relative;
display: inline-block;
}
.dropdown-content {
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
}
.dropdown-content a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
}
.dropdown-content a:hover {background-color: #f1f1f1}
.dropdown:hover .dropdown-content {
display: block;
}
.dropdown:hover .dropbtn {
background-color: #3e8e41;
}
</style>
</head>
<body>
<h2>下拉菜單</h2>
<p>鼠標移動到按鈕上打開下拉菜單。</p>
<div class="dropdown">
<button class="dropbtn">下拉菜單</button>
<div class="dropdown-content">
<a href="http://ipnx.cn">PHP中文網(wǎng) 1</a>
<a href="http://ipnx.cn">PHP中文網(wǎng) 2</a>
<a href="http://ipnx.cn">PHP中文網(wǎng) </a>
</div>
</div>
</body>
</html>????? ???? ??? ???
Drop- ?? ?? ??
Leftfloat:left;
rightfloat:right;
Example
<!DOCTYPE html>
<html>
<head>
<title>PHP中文網(wǎng)(php.cn)</title>
<meta charset="utf-8">
<style>
.dropbtn {
background-color: #4CAF50;
color: white;
padding: 16px;
font-size: 16px;
border: none;
cursor: pointer;
}
.dropdown {
position: relative;
display: inline-block;
}
.dropdown-content {
display: none;
position: absolute;
right: 0;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
}
.dropdown-content a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
}
.dropdown-content a:hover {background-color: #f1f1f1}
.dropdown:hover .dropdown-content {
display: block;
}
.dropdown:hover .dropbtn {
background-color: #3e8e41;
}
</style>
</head>
<body>
<h2>下拉內(nèi)容的對齊方式</h2>
<p>left 和 right 屬性指定了下拉內(nèi)容是從左到右或從右到左。</p>
<div class="dropdown" style="float:left;">
<button class="dropbtn">左</button>
<div class="dropdown-content" style="left:0;">
<a href="#">PHP中文網(wǎng) 1</a>
<a href="#">PHP中文網(wǎng) 2</a>
<a href="#">PHP中文網(wǎng) 3</a>
</div>
</div>
<div class="dropdown" style="float:right;">
<button class="dropbtn">右</button>
<div class="dropdown-content">
<a href="#">PHP中文網(wǎng) 1</a>
<a href="#">PHP中文網(wǎng) 2</a>
<a href="#">PHP中文網(wǎng) 3</a>
</div>
</div>
</body>
</html>????? ???? ??? ???
? ?? ??
? ???? ?? ??? ???? ??? ???? ??? ?????.
<!DOCTYPE html>
<html>
<head>
<title>PHP中文網(wǎng)(php.cn)</title>
<meta charset="utf-8">
<style>
ul {
list-style-type: none;
margin: 0;
padding: 0;
overflow: hidden;
background-color: #333;
}
li {
float: left;
}
li a, .dropbtn {
display: inline-block;
color: white;
text-align: center;
padding: 14px 16px;
text-decoration: none;
}
li a:hover, .dropdown:hover .dropbtn {
background-color: #111;
}
.dropdown {
display: inline-block;
}
.dropdown-content {
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
}
.dropdown-content a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
}
.dropdown-content a:hover {background-color: #f1f1f1}
.dropdown:hover .dropdown-content {
display: block;
}
</style>
</head>
<body>
<ul>
<li><a class="active" href="">主頁</a></li>
<li><a href="">新聞</a></li>
<div class="dropdown">
<a href="#" class="dropbtn">下拉菜單</a>
<div class="dropdown-content">
<a href="#">鏈接 1</a>
<a href="#">鏈接 2</a>
<a href="#">鏈接 3</a>
</div>
</div>
</ul>
<p>鼠標移動到 "下拉菜單" 鏈接先顯示下拉菜單。</p>
</body>
</html>????? ???? ??? ???
?
???? ??? ??? ???? ??.
<!DOCTYPE html>
<html>
<head>
<title>PHP中文網(wǎng)（php.cn）</title>
<meta charset="utf-8">
<style>
.dropdown {
position: relative;
display: inline-block;
}
.dropdown-content {
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
}
.dropdown:hover .dropdown-content {
display: block;
}
.desc {
padding: 15px;
text-align: center;
}
</style>
</head>
<body>
<p>移動鼠標到圖片上顯示下拉內(nèi)容。</p>
<div class="dropdown">
<img src="https://img.php.cn/upload/course/000/000/006/580837363b987802.jpg" alt="Trolltunga Norway" width="100" height="50">
<div class="dropdown-content">
<img src="https://img.php.cn/upload/course/000/000/006/580837363b987802.jpg" alt="Trolltunga Norway" width="400" height="200">
<div class="desc">PHP中文網(wǎng)（php.cn）</div>
</div>
</div>
</body>
</html>????? ???? ??? ???
