vue路由懒加载

require amd

const Hello = resolve => require(["@/views/Hello"], resolve);

Webpack 2 使用动态 import

const Welcome = () => import('@/views/Welcome');

组件按组分块

Webpack > 2.4借助不同的特殊的注释语法可以把多个组件打包到一个异步块（chunk）中，
用assigned-group-chunk-name指定的异步块名。

const Welcome = () => import(/* webpackChunkName: "assigned-group-chunk-name" /'@/views/Welcome');
const Hello = () => import(/ webpackChunkName: "assigned-group-chunk-name" */'@/views/Hello');