css 兼容各种iPhone

@media (device-height:480px) and (-webkit-min-device-pixel-ratio:2){/* 兼容iphone4/4s */
.class{}
}
@media (device-height:568px) and (-webkit-min-device-pixel-ratio:2){/* 兼容iphone5 */
.class{}
}
@media(min-device-width:375px)and(max-device-width:667px)and(-webkit-min-device-pixel-ratio:2){
/*iphone6*/
}
@media(min-device-width:414px)and(max-device-width:736px)and(-webkit-min-device-pixel-ratio:3){
/*iphone6plus*/
}