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判断设备横竖屏

/* 横屏 */
@media all and (orientation :landscape) {

} 

/* 竖屏 */
@media all and (orientation :portrait) {

}

判断设备宽高

/* 设备宽度大于 320px 小于 640px */
@media all and (min-320px) and (max-640px) {
    
}

判断设备像素比

/* 设备像素比为 1 */
@media only screen and (-webkit-min-device-pixel-ratio: 1), only screen and (min-device-pixel-ratio: 1) {
    
}

/* 设备像素比为 1.5 */
@media only screen and (-webkit-min-device-pixel-ratio: 1.5), only screen and (min-device-pixel-ratio: 1.5) {
    
}

/* 设备像素比为 2 */
@media only screen and (-webkit-min-device-pixel-ratio: 2), only screen and (min-device-pixel-ratio: 2) {
    
}

常用设备设置

iPhones

/* ----------- iPhone 4 and 4S ----------- */

/* Portrait and Landscape */
@media only screen 
  and (min-device- 320px) 
  and (max-device- 480px)
  and (-webkit-min-device-pixel-ratio: 2) {

}

/* Portrait */
@media only screen 
  and (min-device- 320px) 
  and (max-device- 480px)
  and (-webkit-min-device-pixel-ratio: 2)
  and (orientation: portrait) {
}

/* Landscape */
@media only screen 
  and (min-device- 320px) 
  and (max-device- 480px)
  and (-webkit-min-device-pixel-ratio: 2)
  and (orientation: landscape) {

}

/* ----------- iPhone 5 and 5S ----------- */

/* Portrait and Landscape */
@media only screen 
  and (min-device- 320px) 
  and (max-device- 568px)
  and (-webkit-min-device-pixel-ratio: 2) {

}

/* Portrait */
@media only screen 
  and (min-device- 320px) 
  and (max-device- 568px)
  and (-webkit-min-device-pixel-ratio: 2)
  and (orientation: portrait) {
}

/* Landscape */
@media only screen 
  and (min-device- 320px) 
  and (max-device- 568px)
  and (-webkit-min-device-pixel-ratio: 2)
  and (orientation: landscape) {

}

/* ----------- iPhone 6 ----------- */

/* Portrait and Landscape */
@media only screen 
  and (min-device- 375px) 
  and (max-device- 667px) 
  and (-webkit-min-device-pixel-ratio: 2) { 

}

/* Portrait */
@media only screen 
  and (min-device- 375px) 
  and (max-device- 667px) 
  and (-webkit-min-device-pixel-ratio: 2)
  and (orientation: portrait) { 

}

/* Landscape */
@media only screen 
  and (min-device- 375px) 
  and (max-device- 667px) 
  and (-webkit-min-device-pixel-ratio: 2)
  and (orientation: landscape) { 

}

/* ----------- iPhone 6+ ----------- */

/* Portrait and Landscape */
@media only screen 
  and (min-device- 414px) 
  and (max-device- 736px) 
  and (-webkit-min-device-pixel-ratio: 3) { 

}

/* Portrait */
@media only screen 
  and (min-device- 414px) 
  and (max-device- 736px) 
  and (-webkit-min-device-pixel-ratio: 3)
  and (orientation: portrait) { 

}

/* Landscape */
@media only screen 
  and (min-device- 414px) 
  and (max-device- 736px) 
  and (-webkit-min-device-pixel-ratio: 3)
  and (orientation: landscape) { 

}

Galaxy Phones

/* ----------- Galaxy S3 ----------- */

/* Portrait and Landscape */
@media screen 
  and (device- 320px) 
  and (device-height: 640px) 
  and (-webkit-device-pixel-ratio: 2) {

}

/* Portrait */
@media screen 
  and (device- 320px) 
  and (device-height: 640px) 
  and (-webkit-device-pixel-ratio: 2) 
  and (orientation: portrait) {

}

/* Landscape */
@media screen 
  and (device- 320px) 
  and (device-height: 640px) 
  and (-webkit-device-pixel-ratio: 2) 
  and (orientation: landscape) {

}

/* ----------- Galaxy S4 ----------- */

/* Portrait and Landscape */
@media screen 
  and (device- 320px) 
  and (device-height: 640px) 
  and (-webkit-device-pixel-ratio: 3) {

}

/* Portrait */
@media screen 
  and (device- 320px) 
  and (device-height: 640px) 
  and (-webkit-device-pixel-ratio: 3) 
  and (orientation: portrait) {

}

/* Landscape */
@media screen 
  and (device- 320px) 
  and (device-height: 640px) 
  and (-webkit-device-pixel-ratio: 3) 
  and (orientation: landscape) {

}

/* ----------- Galaxy S5 ----------- */

/* Portrait and Landscape */
@media screen 
  and (device- 360px) 
  and (device-height: 640px) 
  and (-webkit-device-pixel-ratio: 3) {

}

/* Portrait */
@media screen 
  and (device- 360px) 
  and (device-height: 640px) 
  and (-webkit-device-pixel-ratio: 3) 
  and (orientation: portrait) {

}

/* Landscape */
@media screen 
  and (device- 360px) 
  and (device-height: 640px) 
  and (-webkit-device-pixel-ratio: 3) 
  and (orientation: landscape) {

}

HTC Phones

/* ----------- HTC One ----------- */

/* Portrait and Landscape */
@media screen 
  and (device- 360px) 
  and (device-height: 640px) 
  and (-webkit-device-pixel-ratio: 3) {

}

/* Portrait */
@media screen 
  and (device- 360px) 
  and (device-height: 640px) 
  and (-webkit-device-pixel-ratio: 3) 
  and (orientation: portrait) {

}

/* Landscape */
@media screen 
  and (device- 360px) 
  and (device-height: 640px) 
  and (-webkit-device-pixel-ratio: 3) 
  and (orientation: landscape) {

}

iPads

/* ----------- iPad mini ----------- */

/* Portrait and Landscape */
@media only screen 
  and (min-device- 768px) 
  and (max-device- 1024px) 
  and (-webkit-min-device-pixel-ratio: 1) {

}

/* Portrait */
@media only screen 
  and (min-device- 768px) 
  and (max-device- 1024px) 
  and (orientation: portrait) 
  and (-webkit-min-device-pixel-ratio: 1) {

}

/* Landscape */
@media only screen 
  and (min-device- 768px) 
  and (max-device- 1024px) 
  and (orientation: landscape) 
  and (-webkit-min-device-pixel-ratio: 1) {

}

/* ----------- iPad 1 and 2 ----------- */

/* Portrait and Landscape */
@media only screen 
  and (min-device- 768px) 
  and (max-device- 1024px) 
  and (-webkit-min-device-pixel-ratio: 1) {

}

/* Portrait */
@media only screen 
  and (min-device- 768px) 
  and (max-device- 1024px) 
  and (orientation: portrait) 
  and (-webkit-min-device-pixel-ratio: 1) {

}

/* Landscape */
@media only screen 
  and (min-device- 768px) 
  and (max-device- 1024px) 
  and (orientation: landscape) 
  and (-webkit-min-device-pixel-ratio: 1) {

}

/* ----------- iPad 3 and 4 ----------- */

/* Portrait and Landscape */
@media only screen 
  and (min-device- 768px) 
  and (max-device- 1024px) 
  and (-webkit-min-device-pixel-ratio: 2) {

}

/* Portrait */
@media only screen 
  and (min-device- 768px) 
  and (max-device- 1024px) 
  and (orientation: portrait) 
  and (-webkit-min-device-pixel-ratio: 2) {

}

/* Landscape */
@media only screen 
  and (min-device- 768px) 
  and (max-device- 1024px) 
  and (orientation: landscape) 
  and (-webkit-min-device-pixel-ratio: 2) {

}