@media [记录]

  @media screen and (max-width:1660px)

@media screen and (min-width: 960px) and (max-width: 1199px)

@media only screen and (min-width: 480px) and (max-width: 767px)

<link rel="stylesheet" media="(min-width: 641px)" href="css/maintain.css" />

<link rel="stylesheet" media="screen and (min-width:1px) and (max-width:600px)" href="phone.css" />
<link rel="stylesheet" media="screen and (条件) and (条件)" href="pc.css" />

判断手机还是pc
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