Angular SSR localhost：4000 未打开

我有一个 Angular 项目，我想让它兼容 seo。我使用 Angular Universal 执行此操作，但 localhost: 4000 无法打开。当我输入 localhost:4000/index.html 时，它会打开并重定向到 localhost:4000。但是，页面源代码显示为 .所以它没有发生。

我心想：“我是不是做错了什么？”我问。另一个新的 Angular 项目创建了与我在其上创建的相同操作，运行没有问题。

但是，它在我当前的项目中不起作用。

我的文件是这样的；

// 服务器.ts

import 'zone.js/dist/zone-node';
import {enableProdMode} from '@angular/core';
// Express Engine
import {ngExpressEngine} from '@nguniversal/express-engine';
// Import module map for lazy loading
import {provideModuleMap} from '@nguniversal/module-map-ngfactory-loader';

import * as express from 'express';
import {join} from 'path';

// Faster server renders w/ Prod mode (dev mode never needed)
enableProdMode();

// Express server
const app = express();

const PORT = process.env.PORT || 4000;
const DIST_FOLDER = join(process.cwd(), 'dist/browser');

// * NOTE :: leave this as require() since this file is built Dynamically from webpack
const {AppServerModuleNgFactory, LAZY_MODULE_MAP} = require('./dist/server/main');

// Our Universal express-engine (found @ https://github.com/angular/universal/tree/master/modules/express-engine)
app.engine('html', ngExpressEngine({
  bootstrap: AppServerModuleNgFactory,
  providers: [
    provideModuleMap(LAZY_MODULE_MAP)
  ]
}));

app.set('view engine', 'html');
app.set('views', DIST_FOLDER);

// Example Express Rest API endpoints
// app.get('/api/**', (req, res) => { });
// Serve static files from /browser
app.get('*.*', express.static(DIST_FOLDER, {
  maxAge: '1y'
}));

// All regular routes use the Universal engine
app.get('*', (req, res) => {
  res.render('index', { req });
});

// Start up the Node server
app.listen(PORT, () => {
  console.log(`Node Express server listening on http://localhost:${PORT}`);
});

// webpack.server.config.js

// Work around for https://github.com/angular/angular-cli/issues/7200

const path = require('path');
const webpack = require('webpack');

module.exports = {
  mode: 'none',
  entry: {
    // This is our Express server for Dynamic universal
    server: './server.ts'
  },
  target: 'node',
  resolve: { extensions: ['.ts', '.js'] },
  optimization: {
    minimize: false
  },
  output: {
    // Puts the output at the root of the dist folder
    path: path.join(__dirname, 'dist'),
    filename: '[name].js'
  },
  module: {
    rules: [
      { test: /\.ts$/, loader: 'ts-loader' },
      {
        // Mark files inside `@angular/core` as using SystemJS style dynamic imports.
        // Removing this will cause deprecation warnings to appear.
        test: /(\\|\/)@angular(\\|\/)core(\\|\/).+\.js$/,
        parser: { system: true },
      },
    ]
  },
  plugins: [
    new webpack.ContextReplacementPlugin(
      // fixes WARNING Critical dependency: the request of a dependency is an expression
      /(.+)?angular(\\|\/)core(.+)?/,
      path.join(__dirname, 'src'), // location of your src
      {} // a map of your routes
    ),
    new webpack.ContextReplacementPlugin(
      // fixes WARNING Critical dependency: the request of a dependency is an expression
      /(.+)?express(\\|\/)(.+)?/,
      path.join(__dirname, 'src'),
      {}
    )
  ]
};

// tsconfig.app.json

{
  "extends": "../tsconfig.json",
  "compilerOptions": {
    "outDir": "../out-tsc/app",
    "types": []
  },
  "exclude": [
    "test.ts",
    "**/*.spec.ts"
  ]
}

// tsconfig.server.json

{
  "extends": "./tsconfig.app.json",
  "compilerOptions": {
    "outDir": "../out-tsc/app-server",
    "baseUrl": "./"
  },
  "angularCompilerOptions": {
    "entryModule": "app/app.server.module#AppServerModule"
  }
}

// 包.json

{
  "name": "my-project",
  "version": "0.0.0",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e",
    "build:ssr": "npm run build:client-and-server-bundles && npm run compile:server",
    "serve:ssr": "node dist/server",
    "build:client-and-server-bundles": "ng build --prod && ng run my-project:server:production",
    "webpack:server": "webpack --config webpack.server.config.js --progress --colors",
    "compile:server": "webpack --config webpack.server.config.js --progress --colors"
  },
  "private": true,
  "dependencies": {
    "@agm/core": "^1.0.0-beta.5",
    "@angular/animations": "^7.2.7",
    "@angular/cdk": "^7.0.0",
    "@angular/common": "^7.2.7",
    "@angular/compiler": "^7.2.7",
    "@angular/core": "^7.2.7",
    "@angular/forms": "^7.2.7",
    "@angular/http": "^7.2.7",
    "@angular/material": "^7.0.0",
    "@angular/platform-browser": "^7.2.7",
    "@angular/platform-browser-dynamic": "^7.2.7",
    "@angular/platform-server": "^7.2.7",
    "@angular/router": "^7.2.7",
    "@ng-bootstrap/ng-bootstrap": "^3.3.1",
    "@ng-select/ng-select": "^2.10.5",
    "@nguniversal/express-engine": "^7.1.0",
    "@nguniversal/module-map-ngfactory-loader": "^7.1.0",
    "@progress/kendo-angular-treeview": "^2.5.0",
    "angular-tree-component": "^8.0.1",
    "angular2-text-mask": "^9.0.0",
    "bootstrap": "^4.1.3",
    "core-js": "^2.5.4",
    "express": "^4.15.2",
    "jquery": "^3.3.1",
    "ng2-ckeditor": "^1.2.1",
    "ng2-image-viewer": "^2.0.1",
    "ng2-pdf-viewer": "^5.2.3",
    "ngx-card": "^0.2.4",
    "ngx-owl-carousel": "^2.0.7",
    "ngx-toastr": "^9.1.0",
    "primeicons": "^1.0.0",
    "primeng": "^7.0.3",
    "rxjs": "^6.4.0",
    "ts-loader": "^5.3.3",
    "tslib": "^1.9.0",
    "webpack-cli": "^3.2.3",
    "zone.js": "^0.8.29"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "~0.13.0",
    "@angular/cli": "~7.3.3",
    "@angular/compiler-cli": "^7.2.7",
    "@angular/language-service": "^7.2.7",
    "@types/jasmine": "~2.8.6",
    "@types/jasminewd2": "~2.0.3",
    "@types/node": "~8.9.4",
    "codelyzer": "~4.2.1",
    "jasmine-core": "~2.99.1",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~1.7.1",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "~1.4.2",
    "karma-jasmine": "~1.1.1",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "^5.4.1",
    "ts-loader": "^5.2.0",
    "ts-node": "~5.0.1",
    "tslint": "~5.9.1",
    "typescript": "~3.2.4",
    "webpack-cli": "^3.1.0"
  }
}

我在 webpack.server.config.js 的 module.exports 中尝试了模式：“生产”和模式：“开发”。 没有发生。

可能是什么问题呢？我在一个新项目中执行相同的操作运行顺利，但它不适用于我当前的项目。

Thanks.

我试图通过一一删除所有 3rd 方软件包来找到导致问题的软件包。 我没有从他们中得到任何结果。

我在主页上设置了间隔。我没有得到结果。

我确信我的 server.ts 和其他配置文件是正确的，因为当我从头开始创建一个新项目时它们工作正常。这就是为什么我没有提出问题。

虽然我把主页上的代码全部删除了，但是还是打不开。

4天后我解决了我的问题。 token = localStorage.getItem('token');在我的 Auth.Interceptor 文件中；由于 localStorage，我遇到了这些问题。

import { Inject, PLATFORM_ID } from '@angular/core';
import { isPlatformBrowser, isPlatformServer } from '@angular/common';
constructor(@Inject(PLATFORM_ID) private _platformId: Object) { }


if (isPlatformBrowser(this._platformId)) {
   token = localStorage.getItem('token');
}

这样做之后，我能够访问localhost:4000。当然，localstorage、window、setTimeout、document等命令中的所有文件都给出了错误。我通过使用上面“if”中的这些命令获取所有行来解决了我的整个问题。

Thanks.