CSS media queries for targeting mobile devices a

css

/* Smartphones (portrait and landscape) ----------- */
@media only screen
and (min-device-width : 320px)
and (max-device-width : 480px) {
/* Styles */
}

/* Smartphones (landscape) ----------- */
@media only screen
and (min-width : 321px) {
/* Styles */
}

/* Smartphones (portrait) ----------- */
@media only screen
and (max-width : 320px) {
/* Styles */
}

/* iPads (portrait and landscape) ----------- */
@media only screen and(device-width: 768px){
/* Styles */
}

/* iPads (landscape) ----------- */
@media only screen
and (min-device-width : 768px)
and (max-device-width : 1024px)
and (orientation : landscape) {
/* Styles */
}

/* iPads (portrait) ----------- */
@media only screen
and (min-device-width : 768px)
and (max-device-width : 1024px)
and (orientation : portrait) {
/* Styles */
}

/* Desktops and laptops ----------- */
@media only screen and (min-width : 1224px) {
/* Styles */
}

/* Large screens ----------- */
@media only screen and (min-width : 1824px) {
/* Styles */
}

/* iPhone 4 ----------- */
@media only screen and (-webkit-min-device-pixel-ratio: 2) {
/* Styles */
}

/* Android ----------- */

@media only screen and (-webkit-device-pixel-ratio:.75){
    /*低分辨率小尺寸的图片样式*/
}
@media only screen and (-webkit-device-pixel-ratio:1){
    /*普通分辨率普通尺寸的图片样式*/
}
@media only screen and (-webkit-device-pixel-ratio:1.5){
     /*高分辨率大尺寸的图片样式*/
}

html

 <link rel="stylesheet" type="text/css" href="xxx.css" media="only screen and (max-device-width:480px)" />

<!--[if IEMobile 7]>
    <link rel="stylesheet" type="text/css"  href="mobile.css" media="screen"  />
<![endif]-->