适用于Ipad mini(非视网膜):
@media screen and (device-width: 768px) and (device-height: 1024px) and (-webkit-device-pixel-ratio: 1)
对于Ipad 3& 4(视网膜):
@media screen and (device-width: 768px) and (device-height: 1024px) and (-webkit-device-pixel-ratio: 2)
但是有视网膜显示的Ipad mini怎么样?