错误信息

Uncaught ReferenceError: $is not defined

我有两个文件

index.js

import React from 'react'; 
import { render } from 'react-dom';
import App from './containers/App';  

const root = document.getElementById('root');  

render( 
  <App source='https://api.github.com/users/octocat/gists' />,root
);

app.js

import React,{ Component } from 'react';

export default class App extends Component {

componentDidMount() {
    const { source } = this.props;

    console.log($); // throws error
}

render() {
    return (
        <h1>Hey there.</h1>
    );
}
}