运行React Native应用程序时出现“无法找到变量:a”错误

时间:2019-03-14 23:02:41

标签: react-native

当我在Android设备上运行此React Native应用程序时,在设备上显示“无法找到变量:a”错误。我将如何解决这个问题?我已经在下面发布了我的代码。

import React, {Component} from 'react';
import {Platform, StyleSheet, Text, View} from 'react-native';

const instructions = Platform.select({
  ios: 'Press Cmd+R to reload,\n' + 'Cmd+D or shake for dev menu',
  android:
    'Double tap R on your keyboard to reload,\n' +
    'Shake or press menu button for dev menu',
});

type Props = {};
export default class App extends Component<Props> {
  render() {
    return (
      <View style={styles.container}>
        <Text style={styles.welcome}>Welcome to React Native!</Text>
        <Text style={styles.instructions}>To get started, edit App.js</Text>
        <Text style={styles.instructions}>{instructions}</Text>
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: '#F5FCFF',
  },
  welcome: {
    fontSize: 20,
    textAlign: 'center',
    margin: 10,
  },
  instructions: {
    textAlign: 'center',
    color: '#333333',
    marginBottom: 5,
  },
});

1 个答案:

答案 0 :(得分:0)

您是否正在使用TypeScript?如何删除type Props = {};

并更新

export default class App extends Component<Props>

收件人:

export default class App extends Component