移动端web 自适应

   
  <link rel="stylesheet" type="text/css" media="screen and (max-device-width: 400px)" href="tinyScreen.css" />
  
    <link rel="stylesheet" type="text/css" media="screen and (min-width: 400px) and (max-device-width: 600px)" href="smallScreen.css" />

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