超级表达式错误必须为 null 或函数

Question

我正在尝试学习 React Native，但我无法加载应用程序 使用 ： react-native 0.26.2

这是截图

在IOS控制台中，有2016-05-25 22:56:06.525 [warn][tid:main][RCTEventEmitter.m:41] Sending websocketFailed with no listeners registered. 2016-05-25 22:56:06.543 [error][tid:com.facebook.react.JavaScript] Super expression must either be null or a function, not undefined 2016-05-25 22:56:06.545 [fatal][tid:com.facebook.react.RCTExceptionsManagerQueue] Unhandled JS Exception: Super expression must either be null or a function, not undefined 2016-05-25 22:56:06.562 [error][tid:com.facebook.react.JavaScript] Module AppRegistry is not a registered callable module. 2016-05-25 22:56:06.563 [fatal][tid:com.facebook.react.RCTExceptionsManagerQueue] Unhandled JS Exception: Module AppRegistry is not a registered callable module.

似乎找不到来自react-native 的课程。我已经尝试升级，但我仍然收到错误！请帮忙！谢谢！

Answer 1

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

而不是

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