@medeia 的属性
- screen 是媒体类型里的一种，CSS2.1定义了10种媒体类型
2.and 被称为关键字，其他关键字还包括 not(排除某种设备)，only(限定某种设备)
(min-width: 400px) 就是媒体特性，其被放置在一对圆括号中。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
.example {
padding: 20px;
color: white;
}
/* Extra small devices (phones, 600px and down) */
@media only screen and (max-width: 600px) {
.example {
background: red;
}
}
/* Small devices (portrait tablets and large phones, 600px and up) */
@media only screen and (min-width: 600px) {
.example {
background: green;
}
}
/* Medium devices (landscape tablets, 768px and up) */
@media only screen and (min-width: 768px) {
.example {
background: blue;
}
}
/* Large devices (laptops/desktops, 992px and up) */
@media only screen and (min-width: 992px) {
.example {
background: orange;
}
}
/* Extra large devices (large laptops and desktops, 1200px and up) */
@media only screen and (min-width: 1200px) {
.example {
background: pink;
}
}
</style>
</head>
<body>
<h2>响应式判断</h2>
<p class="example">操作浏览器窗口，查看效果。</p>
</body>
</html>
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