require.ensure([], (require)=>{
  let A = require('./a.js').default;
})

import React, {Component} from 'react';

export default class Father extends Component {
  constructor (props)=>{
    super();
    this.state = {
      currentComponent:null
    }
  }

  doSomething = () => {
    require.ensure(['./app2'], (require) => {
      const Comp = require('./app2');
      this.setState({
        currentComponent:<Comp />
      })
    })
  }

  render () {
    return (
      <div>
        <span onClick={this.doSomething} >
          点击后，按需加载模块~
        </span>
        {this.state.currentComponent}
      </div>
    )
  }
}

import React,{Component} from 'react';
export default class Hello extends Component {
  render () {
    return (
      <div>你好，祝你幸福，再见~</div>
    )
  }
}


module.exports= Hello；