• 使用 react JSX 语法
• 使用 react-native StyleSheet 设置样式（驼峰写法）
• 使用 react-native Dimensions 获取设备宽、高、分辨率
• 使用 react-native Platform 获取设置操作系统

// App.js
import React from 'react';
import {
  SafeAreaView,
  StyleSheet,
  Dimensions,
  Platform,
  View,
  Text,
  StatusBar,
} from 'react-native';

const App: () => React$Node = () => {
  return (
    <>
      <StatusBar barStyle="dark-content" />
      <SafeAreaView style={styles.safeAReaViewStyle}>
        <View style={styles.boxViewStyle}>
          <View style={{width: 40, height: 110, backgroundColor: 'green'}}>
            <Text>视图1</Text>
          </View>
          <View style={{width: 60, height: 120, backgroundColor: 'purple'}}>
            <Text>视图2</Text>
          </View>
          <View style={{width: 70, height: 150, backgroundColor: 'cyan'}}>
            <Text>视图3</Text>
          </View>
          <View style={{width: 80, height: 170, backgroundColor: 'orange'}}>
            <Text>视图4</Text>
          </View>
        </View>
        <View style={styles.dimensionsViewStyle}>
          <Text>当前屏幕的宽度：{Dimensions.get('window').width}</Text>
          <Text>当前屏幕的高度：{Dimensions.get('window').height}</Text>
          <Text>当前屏幕的分辨率：{Dimensions.get('window').scale}</Text>
          <Text>当前运行平台：{Platform.OS}</Text>
        </View>
      </SafeAreaView>
    </>
  );
};

const styles = StyleSheet.create({
  safeAReaViewStyle: {
    flex: 1,
    backgroundColor: 'red',
  },
  boxViewStyle: {
    flexDirection: 'row',
    justifyContent: 'space-evenly',
  },
  dimensionsViewStyle: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
  },
});

export default App;