CSS 常用的幾種選擇器
阿新 • • 發佈:2018-12-23
1、基本選擇器
元素選擇器
<html>
<head>
<meta charset="UTF-8">
<title>元素選擇器</title>
<style type="text/css">
span{color:red;font-size: 20px}
</style>
</head>
<body>
<span>hello</span><br/>
<span>world</span>
</body >
</html>
執行效果:
id選擇器
<html>
<head>
<meta charset="UTF-8">
<title>id選擇器</title>
<style type="text/css">
#div1{background-color: red}
#div2{background-color: pink}
</style>
</head>
<body>
<div id = "div1">hello world1</div >
<div id = "div1">hello world1</div>
<div id = "div2">hello world2</div>
</body>
</html>
執行結果:
class選擇器
<html>
<head>
<meta charset="UTF-8">
<title>class選擇器</title>
<style type="text/css">
.style1{background-color : red}
.style2{background-color: pink}
</style>
</head>
<body>
<div class = "style1">div1</div>
<div class = "style1">div2</div>
<div class = "style2">div3</div>
</body>
</html>
執行結果:
基本選擇器的優先順序:
id > class > 元素
2、屬性選擇器
格式:基本選擇器[屬性 = ‘屬性值’]{ }
<html>
<head>
<meta charset="UTF-8">
<title>屬性選擇器</title>
<style type="text/css">
input[type = 'text'] {background-color: red}
input[type = 'password'] {background-color: pink}
</style>
</head>
<body>
<form>
name:<input type = "text"><br/>
pass:<input type = "password">
</form>
</body>
</html>
執行結果:
3、偽類選擇器
<html>
<head>
<meta charset="UTF-8">
<title>偽類選擇器</title>
<style type="text/css">
a:link{color:green ;font-size: 50px}
a:hover{color:pink;font-size: 50px}
a:active{color:yellow;font-size: 50px}
a:visited{color:red;font-size: 50px}
</style>
</head>
<body>
<a href = "#">點選</a>
</body>
</html>
效果:
開啟網頁時標籤為綠色
將滑鼠放在標籤上時標籤為粉色
點選標籤是標籤為黃色
點選後標籤為紅色
4、層級選擇器
<html>
<head>
<meta charset="UTF-8">
<title>層級選擇器</title>
<style type="text/css">
#d1 .dd2 span{color:red}
</style>
</head>
<body>
<div id = "d1">
<div class = "dd1">
<span>span1-1</span>
</div>
<div class = "dd2">
<span>span1-2</span>
</div>
</div>
<div id = "d2">
<div class = "dd1">
<span>span2-1</span>
</div>
<div clss = "dd2">
<span>span2-2</span>
</div>
</div>
</body>
</html>
執行結果: