class ZLFReactNativeDemo extends Component {
  render() {
    return (
      <View style={styles.container}>
        <View style={styles.style1}></View>
        <View style={styles.style2}></View>
        <View style={styles.style3}></View>
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
　　 flexDirection: column,
    backgroundColor: ‘#00FFFF‘,
  },
  style1: {
    flex: 2,
    backgroundColor: ‘red‘,
  },
  style2: {
    flex: 4,
    backgroundColor: ‘blue‘,
  },
  style3: {
    flex: 8,
    backgroundColor: ‘green‘,
  },
});