index.js
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';
import './index.css';
import test from './Component/test';
ReactDOM.render(
<App />,
document.getElementById('root')
);
正确的 app.js
import React, { Component } from 'react';
import logo from './logo.svg';
require('./App.css');
class App extends Component {
render() {
return (
<div className="App">
<div className="App-header">
<img src={logo} className="App-logo" alt="logo" />
<h2>Welcome to React</h2>
</div>
<p className="App-intro">
To get started, edit <code>src/App.js</code> and save to reload.
</p>
</div>
);
}
}
export default App;
错误的test.js
import React, { Component } from 'react';
import logo from '../logo.svg';
require('../App.css');
class App1 extends Component {
render() {
return (
<div className="App">
<div className="App-header">
<img src={logo} className="App-logo" alt="logo" />
<h2>Welcome to React</h2>
</div>
<p className="App-intro">
To get started, edit <code>src/App.js</code> and save to reload.
</p>
</div>
);
}
}
export default App1;
eslint 的警告而已,index.js 引入了 test 但没被使用。