Vue路由懒加载的三种姿势

1、ES6提供的import()

// 下面3行代码，没有指定webpackName，每个组件打包成一个js文件。
const Home = () => import('@/components/home')
const Index = () => import('@/components/index')
const About = () => import('@/components/about')

// 下面3行代码，指定了相同的webpackName，会合并打包成一个js文件。 把组件按组分块
const Home = () => import( /* webpackName: 'ImportFuncDemo' */ '@/components/home')
const Index = () => import( /* webpackName: 'ImportFuncDemo' */ '@/components/index')
const About = () => import( /* webpackName: 'ImportFuncDemo' */ '@/components/about')

{
    path: '/about',
    component: About
}, {
    path: '/index',
    component: Index
}, {
    path: '/home',
    component: Home
}

2、Vue官方的require()

使用vue的异步组件技术，可以实现按需加载。但是,这种情况下一个组件生成一个js文件。

/* vue异步组件技术 */
{
    path: '/home',
    name: 'home',
    component: resolve => require(['@/components/home'], resolve)
}, {
    path: '/index',
    name: 'Index',
    component: resolve => require(['@/components/index'], resolve)
}, {
    path: '/about',
    name: 'about',
    component: resolve => require(['@/components/about'], resolve)
}

3、Webpack提供的require(),ensure()

// 多个路由指定相同的webpackName，会合并打包成一个js文件。
{
    path: '/home',
    name: 'home',
    component: r => require.ensure([], () => r(require('@/components/home')), 'webpackName')
}, {
    path: '/index',
    name: 'Index',
    component: r => require.ensure([], () => r(require('@/components/index')), 'webpackName')
}, {
    path: '/about',
    name: 'about',
    component: r => require.ensure([], () => r(require('@/components/about')), 'webpackName')
}