“懶加載也叫延遲加載,即在需要的時候進行加載,隨用隨載。在單頁應用中,如果沒有應用懶加載,運用webpack打包後的文件將會異常的大,造成進入首頁時,需要加載的內容過多,延時過長,不利於用戶體驗,而運用懶加載則可以將頁面進行劃分,需要的時候加載頁面,可以有效的分擔首頁所承擔的加載壓力,減少首頁加載用時。”
- 路由懶加載
原路由配置:import Vue from "vue"; import Router from "vue-router"; import FansData from './views/FansData'; import InviteInGroup from "./views/InviteInGroup"; Vue.use(Router); export default new Router({ mode: "history", routes: [ { path: "/fans", name: "FansData", component: FansData }, { path: "/fans/invite", name: "InviteInGroup", component: InviteInGroup } ] });
打包後的js文件中只有:app.js
按需加載:
- 方法一: vue通過異步組件實現懶加載,方法如下:
component:resolve=>(require(['需要加載的路由的地址']),resolve)
import Vue from "vue";
import Router from "vue-router";
Vue.use(Router);
export default new Router({
mode: "history",
routes: [
{
path: "/fans",
name: "FansData",
component: resolve => require(["./views/FansData"], resolve)
},
{
path: "/fans/invite",
name: "InviteInGroup",
component: resolve => require(["./views/InviteInGroup"], resolve)
}
]
});
在/fans
頁面中network中:
從圖上看,加載了一個路由時,只打包了一個文件
訪問/fans/invite
時:
- 方法二:ES 的import方法,方法如下:
const HelloWorld = ()=>import('需要加載的模塊地址')(可指定打包後的文件名)
import Vue from "vue";
import Router from "vue-router";
const FansData = () =>
import(/* webpackChunkName: "FansData" */ "./views/FansData");
const InviteInGroup = () =>
import(/* webpackChunkName: "IntiveInGroup" */ "./views/InviteInGroup");
Vue.use(Router);
export default new Router({
mode: "history",
routes: [
{
path: "/fans",
name: "FansData",
component: FansData
},
{
path: "/fans/invite",
name: "InviteInGroup",
component: InviteInGroup
}
]
});
在/fans
頁面中network中:
訪問/fans/invite
時:
- webpack提供的require.ensure
import Vue from "vue"; import Router from "vue-router"; Vue.use(Router); export default new Router({ mode: "history", routes: [ { path: "/fans", name: "FansData", component: r => require.ensure([], () => r(require("./views/FansData")), "fansData") }, { path: "/fans/invite", name: "InviteInGroup", component: r => require.ensure([],() => r(require("./views/InviteInGroup")),"inviteInGroup") } ] });
按需加載會在頁面第一次請求的時候,把相關路由組件塊的js添加上;非按需加載則會把所有的路由組件塊的js包打在一起。
參考文檔: