--- iPhone ---
iPhone SE 1136 * 640 2.0875
iPhone 6 1334 * 750 1.778666666666667
iPhone X 2436 * 1125 2.165333333333333
--- iPad ---
iPad Pro 2732 * 2048 1.333984375
--- Android ---
2960 * 1440 2.055555555555556?
2160 * 1080 2
1920 * 1080 1.777777777777778?
1280 * 720 1.777777777777778?
原文：https://www.cnblogs.com/sweetXiaoma/p/11549682.html