text: 
  /**
   * 设备宽高、 像素比、 ISO顶部高度为20、 android为0
   */
  
  import { Dimensions, Platform, PixelRatio } from 'react-native'
  
  export default {
      width: Dimensions.get('window').width,
      height: Dimensions.get('window').height,
      onePixel: 1 / PixelRatio.get(),
      statusBarHeight: (Platform.OS === 'ios' ? 20 : 0)
  }