jQuery - Get and set CSS classes
jQuery Manipulating CSS
jQuery has several methods for CSS manipulation. We will study the following:
addClass() - Add one or more classes to the selected element
removeClass() - Remove one or more classes from the selected element
toggleClass() - Add/delete class switching operation for selected elements
css() - Set or return style attributes
Style sheet
.important
{
font-weight:bold;
font-size:xx-large;
}
addClass() method
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("h1,h2,p").addClass("blue");
$("div").addClass("important");
});
});
</script>
<style type="text/css">
.important
{
font-weight:bold;
font-size:xx-large;
}
.blue
{
color:blue;
}
</style>
</head>
<body>
<h1>标题 1</h1>
<h2>标题 2</h2>
<p>段落1</p>
<p>段落2</p>
<div>文本</div>
<br>
<button>为元素添加 class</button>
</body>
</html>You can also specify multiple classes in the addClass() method ：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("#div1").addClass("important blue");
});
});
</script>
<style type="text/css">
.important
{
font-weight:bold;
font-size:xx-large;
}
.blue
{
color:blue;
}
</style>
</head>
<body>
<div id="div1">文本。</div>
<div id="div2">文本。</div>
<br>
<button>为第一个元素添加类</button>
</body>
</html>removeClass() method
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("h1,h2,p").removeClass("blue");
});
});
</script>
<style type="text/css">
.important
{
font-weight:bold;
font-size:xx-large;
}
.blue
{
color:blue;
}
</style>
</head>
<body>
<h1 class="blue">标题 1</h1>
<h2 class="blue">标题 2</h2>
<p class="blue">段落1</p>
<p>段落2</p>
<br>
<button>从元素中移除 class</button>
</body>
</html><!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("h1,h2,p").toggleClass("blue");
});
});
</script>
<style type="text/css">
.blue
{
color:blue;
}
</style>
</head>
<body>
<h1 class="blue">标题 1</h1>
<h2 class="blue">标题 2</h2>
<p class="blue">段落1</p>
<p>段落2</p>
<br>
<button>切换 class</button>
</body>
</html>
new file
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>php中文网(php.cn)</title>
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("#btn").click(function(){
$("div").addClass("border reset");
})
})
</script>
<style type="text/css">
div{
height:100px;
width:200px;
}
.border{
border:2px solid blue;
}
.reset{
font-size:20px;
color:green;
}
</style>
</head>
<body>
<div>php.cn欢迎您</div>
<button id="btn">点击查看效果</button>
</body>
</html>
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