Vue 伺服器端渲染SSR範例詳解

2022-07-09 22:00:50

手寫Vue伺服器端渲染

概念：放在瀏覽器進行就是瀏覽器渲染,放在伺服器進行就是伺服器渲染。

使用者端渲染不利於 SEO 搜尋引擎優化
伺服器端渲染是可以被爬蟲抓取到的，使用者端非同步渲染是很難被爬蟲抓取到的
SSR直接將HTML字串傳遞給瀏覽器。大大加快了首屏載入時間。
SSR佔用更多的CPU和記憶體資源
一些常用的瀏覽器API可能無法正常使用
在vue中只支援beforeCreate和created兩個生命週期

一.開始vue-ssr之旅

yarn add vue-server-renderer vue
yarn add koa koa-router

createRenderer,建立一個渲染函數 renderToString, 渲染出一個字串

const Vue = require('vue');
const render = require('vue-server-renderer');
const Koa = require('koa');
const Router = require('koa-router');
const app = new Koa();
const router = new Router();
const vm = new Vue({
    data(){
        return {msg:"hello world"}
    },
    template:`<div>{{msg}}</div>`
});
router.get('/',async (ctx)=>{
    let r = await render.createRenderer().renderToString(vm);
    ctx.body = `
    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <meta http-equiv="X-UA-Compatible" content="ie=edge">
        <title>Document</title>
    </head>
    <body>
        ${r}
    </body>
    </html>
    `
});
app.use(router.routes());
app.listen(4000);

二.採用模板渲染

<!DOCTYPE html>
<html lang="en">
  <head><title>Hello</title></head>
  <body>
    <!--vue-ssr-outlet-->
  </body>
</html>

傳入template 替換掉註釋標籤

const Vue = require('vue');
const render = require('vue-server-renderer');
const Koa = require('koa');
const Router = require('koa-router');
const app = new Koa();
const router = new Router();
const vm = new Vue({
    data(){
        return {msg:"hello world"}
    },
    template:`<div>{{msg}}</div>`
});
const template = require('fs').readFileSync('./index.html','utf8');
router.get('/',async (ctx)=>{
    let r = await render.createRenderer({
        template
    }).renderToString(vm);
    ctx.body = r;
});
app.use(router.routes());
app.listen(4000);

三.ssr目錄建立

├── config
│   ├── webpack.base.js
│   ├── webpack.client.js
│   └── webpack.server.js
├── dist
│   ├── client.bundle.js
│   ├── index.html
│   ├── index.ssr.html
│   ├── server.bundle.js
│   ├── vue-ssr-client-manifest.json
│   └── vue-ssr-server-bundle.json
├── package.json
├── public
│   ├── index.html
│   └── index.ssr.html
├── server.js
├── src
│   ├── App.vue
│   ├── components
│   │   ├── Bar.vue
│   │   └── Foo.vue
│   ├── entry-client.js
│   ├── entry-server.js
│   ├── app.js
│   ├── router.js
│   └── store.js
├── webpack.config.js

四.通過webpack實現編譯vue專案

安裝外掛

yarn add webpack webpack-cli webpack-dev-server vue-loader vue-style-loader css-loader html-webpack-plugin @babel/core @babel/preset-env babel-loader vue-template-compiler webpack-merge

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const VueLoaderPlugin = require('vue-loader/lib/plugin')
const resolve = (dir)=>{
    return path.resolve(__dirname,dir)
}
module.exports = {
    entry: resolve('./src/client-entry.js'),
    output:{
        filename:'[name].bundle.js',
        path:resolve('dist')
    },
    module:{
        rules:[
            {
                test:/.css$/,
                use:['vue-style-loader','css-loader']
            },
            {
                test:/.js$/,
                use:{
                    loader:'babel-loader',
                    options:{
                        presets:['@babel/preset-env']
                    }
                },
                exclude:/node_modules/
            },
            {
                test:/.vue$/,
                use:'vue-loader'
            }
        ]
    },
    plugins:[
        new VueLoaderPlugin(),
        new HtmlWebpackPlugin({
            template:'./index.html'
        })
    ]
}

app.js

import Vue from "vue";
import App from "./App.vue";
export default () => { // 為了保證範例的唯一性所以匯出一個建立範例的函數
  const app = new Vue({
    render: h => h(App)
  });
  return { app };
};

client-entry.js

import createApp from "./app";
const { app } = createApp();
app.$mount("#app"); // 使用者端渲染手動掛載到dom元素上

server-entry.js

import createApp from "./app";
export default () => {
  const { app } = createApp();
  return app; // 伺服器端渲染只需將渲染的範例匯出即可
};

五.設定使用者端打包和伺服器端打包

webpack.base.js

let path = require('path');
let VueLoaderPlugin = require('vue-loader/lib/plugin')
module.exports = {
    output:{
        filename:'[name].bundle.js',
        path:path.resolve(__dirname,'../dist')
    },
    module:{
        rules:[
            {test:/.css/,use:['vue-style-loader','css-loader']},
            {
                test:/.js/,
                use:{
                    loader:'babel-loader',
                    options:{
                        presets:['@babel/preset-env']
                     },
                },
                exclude:/node_modules/,
            },
            {test:/.vue/,use:'vue-loader'}
        ]
    },
    plugins:[
        new VueLoaderPlugin()
    ]
}

webpack.client.js

const merge = require("webpack-merge");
const path = require("path");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const base = require("./webpack.base");
const resolve = filepath => {
  return path.resolve(__dirname, filepath);
};
module.exports = merge(base, {
  entry: {
    client: resolve("../src/client-entry.js")
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: resolve("../template/index.client.html")
    })
  ]
});

webpack.server.js

const merge = require("webpack-merge");
const path = require("path");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const base = require("./webpack.base");
const resolve = filepath => {
  return path.resolve(__dirname, filepath);
};
module.exports = merge(base, {
  entry: {
    server: resolve("../src/server-entry.js")
  },
  target: "node",
  output: {
    libraryTarget: "commonjs2" // 匯出供伺服器端渲染來使用
  },
  plugins: [
    new HtmlWebpackPlugin({
      filename: "index.ssr.html",
      template: resolve("../template/index.ssr.html"),
      excludeChunks: ["server"]
    })
  ]
});

六.設定執行指令碼

"scripts": {
    "client:dev": "webpack-dev-server --config ./build/webpack.client.js", // 使用者端開發環境
    "client:build": "webpack --config ./build/webpack.client.js", // 使用者端打包環境
    "server:build": "webpack --config ./build/webpack.server.js" // 伺服器端打包環境
 },

七.伺服器端設定

在App.vue上增加id="app"可以保證元素被正常啟用

const Koa = require("koa");
const Router = require("koa-router");
const static = require("koa-static");
const path = require("path");
const app = new Koa();
const router = new Router();
const VueServerRenderer = require("vue-server-renderer");
const fs = require("fs");
// 伺服器端打包的結果
const serverBundle = fs.readFileSync("./dist/server.bundle.js", "utf8");
const template = fs.readFileSync("./dist/index.ssr.html", "utf8");
const render = VueServerRenderer.createBundleRenderer(serverBundle, {
  template
});
router.get("/", async ctx => {
  ctx.body = await new Promise((resolve, reject) => {
    render.renderToString((err, html) => {
      // 必須寫成回撥函數的方式否則樣式不生效
      resolve(html);
    });
  });
});
app.use(router.routes());
app.use(static(path.resolve(__dirname, "dist")));
app.listen(3000);

在index.ssr.html中需要手動引入使用者端打包後的結果

七.通過json設定createBundleRenderer方法

實現熱更新,自動增加preload和prefetch,以及可以使用sourceMap

const VueSSRClientPlugin = require('vue-server-renderer/client-plugin'); // 在使用者端打包時增加外掛
const VueSSRServerPlugin = require('vue-server-renderer/server-plugin'); // 在伺服器端打包時增加外掛


const Koa = require("koa");
const Router = require("koa-router");
const static = require("koa-static");
const path = require("path");
const app = new Koa();
const router = new Router();
const VueServerRenderer = require("vue-server-renderer");
const fs = require("fs");
// 伺服器端打包的結果
// const serverBundle = fs.readFileSync("./dist/server.bundle.js", "utf8");
const template = fs.readFileSync("./dist/index.ssr.html", "utf8");
const serverBundle = require("./dist/vue-ssr-server-bundle.json");
const clientManifest = require("./dist/vue-ssr-client-manifest.json");
const render = VueServerRenderer.createBundleRenderer(serverBundle, {
  template,
  clientManifest // 自動注入使用者端打包後的檔案
});

router.get("/", async ctx => {
  ctx.body = await new Promise((resolve, reject) => {
    render.renderToString((err, html) => {
      // 必須寫成回撥函數的方式否則樣式不生效
      resolve(html);
    });
  });
});
app.use(router.routes());
app.use(static(path.resolve(__dirname, "dist")));
app.listen(3000);

八.整合VueRouter

yarn add vue-router

import Vue from "vue";
import VueRouter from "vue-router";
import Foo from "./components/Foo.vue";
Vue.use(VueRouter);
export default () => {
  const router = new VueRouter({
    mode: "history",
    routes: [
      { path: "/", component: Foo },
      { path: "/bar", component: () => import("./components/Bar.vue") }
    ]
  });
  return router;
};

匯出路由設定

設定入口檔案

import Vue from "vue";
import App from "./App.vue";
import createRouter from "./router";
export default () => {
  const router = createRouter();
  const app = new Vue({
    router,
    render: h => h(App)
  });
  return { app, router };
};

設定元件資訊

<template>
    <div id="app">
        <router-link to="/"> foo</router-link>
        <router-link to="/bar"> bar</router-link>
        <router-view></router-view>
    </div>
</template>

防止重新整理頁面不存在

router.get("*", async ctx => {
  ctx.body = await new Promise((resolve, reject) => {
    render.renderToString({ url: ctx.url }, (err, html) => {
      // 必須寫成回撥函數的方式否則樣式不生效
      resolve(html);
    });
  });
});

保證非同步路由載入完成

export default ({ url }) => {
  return new Promise((resolve, reject) => {
    const { app, router } = createApp();
    router.push(url);
    router.onReady(() => {
      const matchComponents = router.getMatchedComponents();
      if (!matchComponents.length) {
        return reject({ code: 404 });
      }
      resolve(app);
    }, reject);
  });
};

// 伺服器可以監控到錯誤資訊，返回404
render.renderToString({ url: ctx.url }, (err, html) => {
      // 必須寫成回撥函數的方式否則樣式不生效
    if (err && err.code == 404) {
    resolve("404 Not Found");
    }
    resolve(html);
});

十.整合vuex設定

yarn add vuex

import Vue from 'vue';
import Vuex from 'vuex';
Vue.use(Vuex);

export default ()=>{
    let store = new Vuex.Store({
        state:{
            username:'song'
        },
        mutations:{
            changeName(state){
                state.username = 'hello';
            }
        },
        actions:{
            changeName({commit}){
                return new Promise((resolve,reject)=>{
                    setTimeout(() => {
                        commit('changeName');
                        resolve();
                    }, 1000);
                })
            }
        }
    });
    return store
}

// 參照vuex
import createRouter from './router';
import createStore from './store'
export default ()=>{
    let router = createRouter();
    let store = createStore();
    let app = new Vue({
        router,
        store,
        render:(h)=>h(App)
    })
    return {app,router,store}
}

在後端更新vuex

import createApp from './main';
export default (context)=>{
    return new Promise((resolve)=>{
        let {app,router,store} = createApp();
        router.push(context.url); // 預設存取到/a就跳轉到/a
        router.onReady(()=>{
            let matchComponents = router.getMatchedComponents(); // 獲取路由匹配到的元件
            
            Promise.all(matchComponents.map(component=>{
                if(component.asyncData){
                    return component.asyncData(store);
                }
            })).then(()=>{
                context.state = store.state; // 將store掛載在window.__INITIAL_STATE__
                resolve(app);

            });
        })
    })
}

在瀏覽器執行時替換store

// 在瀏覽器執行程式碼
if(typeof window !== 'undefined' && window.__INITIAL_STATE__){
    store.replaceState(window.__INITIAL_STATE__);
}

需要執行的勾點函數

export default {
 mounted() {
  return this.$store.dispatch("changeName");
 },
 asyncData(store) {
  return store.dispatch("changeName");
 }
};

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