React.createElement:类型在Expo上无效 [英] React.createElement: type is invalid on Expo

问题描述

我刚刚开始学习React Native，并尝试在Expo上进行RN.现在我收到了这个错误.

I'm just starting to learn React Native and I tried to do RN on Expo. Now I'm getting this error.

Warning: React.createElement: type is invalid -- expected a string (for 
built-in components) or a class/function (for composite components) 
but got: object. You likely forgot to export your component from the 
file it's defined in.

我的代码是

import React from 'react';
import {Text, AppRegistry} from 'react-native';

const App = () => (
    <Text>Some Text </Text>
    );


AppRegistry.registerComponent('helloworld', () => App );

我将此鳕鱼放在 App.js 文件

推荐答案

您可以这样做:

import React, { Component } from 'react';
import {Text, AppRegistry} from 'react-native';

export default class App extends Component {
  render() {
    return (
      <Text>Hello world!</Text>
    );
  }
}


AppRegistry.registerComponent('helloworld', () => App );

这篇关于React.createElement:类型在Expo上无效的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！