小编Muh*_*sar的帖子

我正在使用ionic 3 whatsapp clone github项目，但是当我运行ionic serve命令时，当我尝试安装appscripts错误时出现此错误npm WARN deprecated browserslist@2.11.3: Browserslist 2 could fail on reading Browserslist >3.0 config used in other tools.

I'm new to react native, I'm bit confused about components.

As I created first react native app I saw App.js the components in App.js created as per following code:

export default function App() {
 ...
}

and as I saw tutorials many people almost all people making components as per following code:

const FirstComponents = () => {
  ...
}

I'm also confuse about function components and class based components which created as per following code:

export default class FirstComponents …

我在练习时收到错误状态未定义，因为我检查文档，他们使用相同的格式来创建状态

function App() {

  // build state
  state = {
    Name:'Hamza',
    Status: 'Comitted'
  };
  // function
  ChangeProfile=()=>{
    this.setState({
      Name: 'Shahwar'
    });
    this.setState({
      Status: 'Divorced'
    });
    console.log('updated',this.state);
  }
  return (
    <View style={styles.container}>
      <Text>{this.state.Name}</Text>
      <Text>{this.state.Status}</Text>
      <Button title="Click Me!" onPress={this.ChangeProfile} />
    </View>
  );
}

export default App;