Question

成为React的新手我坚持看似非常简单的事情。不知道到底出了什么问题。

我有一个 BasicReactComponent.js 组件，如下所示：

import React from 'react';

const BasicReactComp = () => {
  console.log('hi');
  return (
    <div>
      I was loaded from basic react comp.
    </div>
  );
};

export default BasicReactComp;

我试图在我的主文件中调用它，如下所示：

import React from 'react';
import ReactDOM from 'react-dom';
const BasicReactComp = require('./BasicReactComp');

ReactDOM.render(
 <BasicReactComp />,
 document.getElementById('foo')
);

我一直收到以下错误

**Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object.
    Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object.**

Answer 1

在ES6模块和CommonJS模块之间进行转换时，默认导出将导出为default 属性。因此，您必须访问.default的值require：

const BasicReactComp = require('./BasicReactComp').default;

或使用import语法：

import BasicReactComp from './BasicReactComp';

React - 不变违规例外

1 个答案: