11.2 简单媒体查询 <link rel="stylesheet" media="(min

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <!-- pc端样式 -->
    <link rel="stylesheet" media="(min-width:1200px)" href="./CSS/1-pc.css">
    <!-- ipad端样式 -->
    <link rel="stylesheet" media="(min-width:768px) and (max-width:1199px)" href="./CSS/2-ipad.css">
    <!-- iphone端样式 -->
    <link rel="stylesheet" media="(max-width:600px)" href="./CSS/3-iphone.css">
</head>
<body>
    <div class="parent">
        <div class="child"></div>
        <div class="child"></div>
        <div class="child"></div>
        <div class="child"></div>
    </div>
</body>
</html>