让react-native 彻底支持ios和安卓的阴影写法

      test:{
  width: 300,
          height: 400,
          marginLeft: 20,
          marginTop: 20,
          backgroundColor: 'red',
          shadowColor: "rgba(195, 60, 17, 0.5)",
          shadowOffset: {
            width: 0,
            height: 8
          },
          shadowRadius: 20,
          shadowOpacity: 1,
          elevation: 10
}