react 实现路由按需加载

import() 方法：

1. async.js 文件内容：

import React from 'react';
// import "babel-polyfill";
//componentFactory是一个函数,可以异步加载组件,import方法会返回一个promise,promise完成后会resolve一个对象 {default:组件}
export default function (componentFactory) {
  class AsyncComponent extends React.Component {
    constructor() {
      super();
      this.state = {component: null};
    }
    async componentDidMount() {
      let {default: component} = await componentFactory();
      this.setState({component});
    }
    render() {
      let Comp = this.state.component;
      return Comp ? <Comp {...this.props}/> : null;
    }
  }
  return AsyncComponent;
}

2. 使用：

// 按需加载
import async from '../async'
let ButtonDemo = async(() => import("./ButtonDemo"));
let InputDemo = async(() => import("./InputDemo"));

• 项目地址：https://github.com/cag2050/react_antd_demo