{
path: '/promisedemo',   name: 'PromiseDemo',   component: resolve => require(['../components/PromiseDemo'], resolve)
}

// 下面2行代码，没有指定webpackChunkName，每个组件打包成一个js文件。 const ImportFuncDemo1 = () => import('../components/ImportFuncDemo1') const ImportFuncDemo2 = () => import('../components/ImportFuncDemo2') // 下面2行代码，指定了相同的webpackChunkName，会合并打包成一个js文件。 // const ImportFuncDemo = () => import(/* webpackChunkName: 'ImportFuncDemo' */ '../components/ImportFuncDemo') // const ImportFuncDemo2 = () => import(/* webpackChunkName: 'ImportFuncDemo' */ '../components/ImportFuncDemo2') export default new Router({   routes: [     {       path: '/importfuncdemo1',       name: 'ImportFuncDemo1',       component: ImportFuncDemo1     },     {       path: '/importfuncdemo2',       name: 'ImportFuncDemo2',       component: ImportFuncDemo2     }   ] })

{   path: '/promisedemo',   name: 'PromiseDemo',   component: resolve => require.ensure([], () => resolve(require('../components/PromiseDemo')), 'demo') }, {   path: '/hello',   name: 'Hello',   // component: Hello   component: resolve => require.ensure([], () => resolve(require('../components/Hello')), 'demo') }