3.响应式

响应式布局 <link rel="stylesheet" href="css1.css" media="screen and (min-width:800px)"/> <link rel="stylesheet" href="css2.css" media="screen and (min-width:600px) and (max-width:800px)"/> <link rel="stylesheet" href="css3.css" media="screen and (max-width:400px)"/>

横屏portrait竖屏landscape <link rel="stylesheet" href="css3.css" media="screen and (orientation:portrait)"/> <link rel="stylesheet" href="css1.css" media="screen and (orientation:landscape)"/>

行内样式 @media screen and (min-width: 800px){} @media screen and (min-width: 400px) and (max-width: 800px){} @media screen and (max-width: 400px){}