vue（组件、路由）懒加载

const Login = resolve => require(['@/components/Login'], resolve)    //就不用import了


Vue.use(Router)

let router = new Router({
  // mode: 'history',
  routes: [ //根据这个遍历得到左边菜单
  {
    path: '/login',
    name: '登录',
    component: Login
  },

（组件、路由）懒加载

 

• 懒加载也叫延迟加载，即在需要的时候进行加载，随用随载

  在单页应用中，如果没有应用懒加载，运用webpack打包后的文件将会异常的大，
  造成进入首页时，需要加载的内容过多，延时过长，不利于用户体验，
  运用懒加载可以将页面进行划分，按需加载页面，可以分担首页所承担的加载压力，减少加载用时。

• 一种代码分块的语法，使用 AMD 风格的 require

const Foo = resolve => require(['./Foo.vue'], resolve);
const router = new VueRouter({
  routes: [
    { path: '/foo', component: Foo }
  ]
})

//router/index.js
import Vue from 'vue'
import Router from 'vue-router'
Vue.use(Router)

const router = new Router({
  routes: [
    {
      mode: 'history',
      path: '/home',
      name: 'home',
      component:  resolve => require([URL], resolve),//懒加载
      children: [
        {
          mode: 'history',
          path: '/home/:name',
          name: 'any',
          component: resolve => require(['@/components/any'], resolve),//懒加载
        },
      ]
    },
    {
      mode: 'history',
      path: '/my',
      name: 'my',
      component: resolve => require(['@/components/my'], resolve),//懒加载,
      children: [
        {
            mode: 'history',
            path: '/my/:name',
            name: 'any',
            component: resolve => require(['@/components/any'], resolve),//懒加载
        },
      ]
    },
    {
      path: '/login',
      name: 'Login',
      component: resolve=>require(['@/components/login'],resolve)
    },
  ]
});

有一个问题：项目build以后，这个懒加载还有用吗？