React&RN关键点集锦，持续更新......

1、获取设备宽、高、像素比

import Dimensions from 'Dimensions';
import PixelRatio from 'PixelRatio';
let totalWidth = Dimensions.get('window').width; // 宽度
let totalHeight = Dimensions.get('window').height; // 高度
let pixelRatio = PixelRation.get(); //像素比