App.js can also be considered a component, then this file can define multiple components?
method one
import Hello from './Hello' export default class App extends Component { render(){ return ( <View> <Hello name="你伟哥"/> </View> ); } }
Second way
// functional state can not be written without using the this function the App (The props) { return <= {{the fontSize the Text style: 20 is, the backgroundColor: 'Red', marginTop: 50}}>. Props.name the Hello {} </ the Text> } module.exports = the App;
When you create a project using the react-native init XXX command, he create the component like this:
Only way to write the life cycle of a function assembly
What is the role of the const keyword is also removed all right? seems like it
const App = () => { return ( <Fragment> <StatusBar barStyle="dark-content" /> <SafeAreaView> <ScrollView contentInsetAdjustmentBehavior="automatic" style={styles.scrollView}> <Header /> {global.HermesInternal == null ? null : ( <View style={styles.engine}> <Text style={styles.footer}>Engine: Hermes</Text> </View> )} <View style={styles.body}> <View style={styles.sectionContainer}> <Text style={styles.sectionTitle}>Step One</Text> <Text style={styles.sectionDescription}> Edit <Text style={styles.highlight}>App.js</Text> to change this screen and then come back to see your edits. </Text> </View> <View style={styles.sectionContainer}> <Text style={styles.sectionTitle}>See Your Changes</Text> <Text style={styles.sectionDescription}> <ReloadInstructions /> </Text> </View> <View style={styles.sectionContainer}> <Text style={styles.sectionTitle}>Debug</Text> <Text style={styles.sectionDescription}> <DebugInstructions /> </Text> </View> <View style={styles.sectionContainer}> <Text style={styles.sectionTitle}>Learn More</Text> <Text style={styles.sectionDescription}> Read the docs to discover what to do next: </Text> </View> <LearnMoreLinks /> </View> </ScrollView> </SafeAreaView> </Fragment> ); }; const styles = StyleSheet.create({ scrollView: { backgroundColor: Colors.lighter, }, engine: { position: 'absolute', right: 0, }, body: { backgroundColor: Colors.white, }, sectionContainer: { marginTop: 32, paddingHorizontal: 24, }, sectionTitle: { fontSize: 24, fontWeight: '600', color: Colors.black, }, sectionDescription: { marginTop: 8, fontSize: 18, fontWeight: '400', color: Colors.dark, }, highlight: { fontWeight: '700', }, footer: { color: Colors.dark, fontSize: 12, fontWeight: '600', padding: 4, paddingRight: 12, textAlign: 'right', }, }); export default App;