【初始angular 】angular项目创建过程中需要注意的细节

忘是亡心i 2022-03-06 19:59 299阅读 0赞

# 【初始angular 】angular项目创建过程中需要注意的细节 #

## 安装angular-cli工具 ##

`yarn global add @angular/cli`

> 当前使用版本：Angular CLI: 7.3.1
> 
> 如果是一些企业级项目的话，本人推荐使用的版本比最新版小一个主版本号，防止最新版的一些发现的问题

## 设置包管理工具为yarn ##

`ng config cli.packageManager yarn -g`

> 设置cli的包管理工具，这一步可有可无，你也可以用默认的npm

## 创建项目 ##

`ng new ng-project`

> ng 命令介绍 [angular-cli][]

有两个选项，根据需求选择，以下是当前操作

? Would you like to add Angular routing? Yes
    ? Which stylesheet format would you like to use? Sass   [ http://sass-lang.com   ]

## 热更新 ##

1.  添加@angularclass/hmr包
    
    `yarn add @angularclass/hmr --dev`
2.  创建src/hmr.ts文件
    
        import { NgModuleRef, ApplicationRef } from '@angular/core';
        import { createNewHosts } from '@angularclass/hmr';
        
        export const hmrBootstrap = (
          module: any,
          bootstrap: () => Promise<NgModuleRef<any>>
        ) => {
          let ngModule: NgModuleRef<any>;
          module.hot.accept();
          bootstrap().then(mod => (ngModule = mod));
          module.hot.dispose(() => {
            const appRef: ApplicationRef = ngModule.injector.get(ApplicationRef);
            const elements = appRef.components.map(c => c.location.nativeElement);
            const makeVisible = createNewHosts(elements);
            ngModule.destroy();
            makeVisible();
          });
        };
3.  修改src/main.ts
    
        import { enableProdMode } from '@angular/core';
        import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
        import { AppModule } from './app/app.module';
        import { environment } from './environments/environment';
        import { hmrBootstrap } from './hmr';
        
        declare var module: any;
        
        if (environment.production) {
          enableProdMode();
        }
        
        const bootstrap = () => platformBrowserDynamic().bootstrapModule(AppModule);
        
        if ((environment as any).hmr) {
          if (module.hot) {
            hmrBootstrap(module, bootstrap);
          } else {
            console.error('HMR is not enabled for webpack-dev-job!');
            console.log('Are you using the --hmr flag for ng serve?');
          }
        } else {
          document.addEventListener('DOMContentLoaded', () => {
            bootstrap().catch(err => console.log(err));
          });
        }
4.  创建src/environments/environment.hmr.ts
    
        export const environment = {
          production: false,
          hmr: true
        };
5.  修改angular.json文件
    
    在angular.json的对象`projects.architect.build.configurations`添加以下内容
    
        "hmr": {
            "fileReplacements": [
                {
                    "replace": "src/environments/environment.ts",
                    "with": "src/environments/environment.hmr.ts"
                }
            ]
        }
    
    在angular.json的对象`projects.architect.serve.configurations`添加以下内容
    
        "hmr": {
            "browserTarget": "ng-project:build:hmr",
            "hmr": true
        }
6.  添加热更新启动命令行
    
    在package.json的scripts中添加以下内容
    
        "start:hmr": "ng serve -c hmr"

## 多项目支持 ##

`ng generate application ng-project2`

> 这个命令会在根目录下生产一个projects文件夹，所有生成的项目都在这个文件夹下

## 通过npm模块的方式引用外部依赖 ##

比如ng-project项目和ng-project2需要共用api接口，我们想在在项目中以 @apis/user、@apis/permissions这样的方式使用api接口，两步：

*  创建apis类库`ng generate library apis`
 *  在tsconfig.json中compilerOptions下添加
    
        "paths": {
            "@apis/*": [
                "dist/apis/*"
            ]
        }

## 服务端渲染 ##

`ng add @nguniversal/express-engine --clientProject ng-project --appId ng-project-universal`

*  `yarn add mutation-observer` // 有些库需要比如：ng-zorro-antd
 *  替换 server.ts
    
        import 'zone.js/dist/zone-node';
        import 'reflect-metadata';
        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';
        
        const domino = require('domino');
        const fs = require('fs');
        const template = fs.readFileSync(join(process.cwd(), 'dist/browser/index.html')).toString();
        const win = domino.createWindow(template);
        
        global['window'] = win;
        global['MutationObserver'] = require('mutation-observer');
        Object.defineProperty(win.document.body.style, 'transform', {
          value: () => {
            return {
              enumerable: true,
              configurable: true
            };
          },
        });
        
        global['document'] = win.document;
        global['CSS'] = null;
        
        // 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) => { });
        // Server static files from /browser
        app.get('*.*', express.static(DIST_FOLDER, {
          maxAge: '1y'
        }));
        
        // All regular routes use the Universal engine
        app.get('*', (req, res) => {
          global['navigator'] = req['headers']['user-agent'];
          res.render('index', {req});
        });
        
        // Start up the Node server
        app.listen(PORT, () => {
          console.log(`Node Express server listening on http://localhost:${PORT}`);
        });
 *  替换src/app/app.server.module.ts
    
        import { NgModule } from '@angular/core';
        import { ServerModule, ServerTransferStateModule } from '@angular/platform-server';
        import { AppModule } from './app.module';
        import { AppComponent } from './app.component';
        import { ModuleMapLoaderModule } from '@nguniversal/module-map-ngfactory-loader';
        
        @NgModule({
          imports: [
            AppModule,
            ServerModule,
            ModuleMapLoaderModule,
            ServerTransferStateModule,
          ],
          bootstrap: [AppComponent],
        })
        export class AppServerModule {}
 *  构建 `yarn build:ssr`
 *  运行 `serve:ssr`

> 通过命令生产的 server.ts 不能解决一些浏览器报错的问题，以上的server.ts已经把大部分问题包含了

提供参考项目源码 [https://github.com/loopbless/btf-factoring-manager][https_github.com_loopbless_btf-factoring-manager]

至此，一个逼格较高的angular项目就建好了！

[angular-cli]: https://angular.cn/cli
[https_github.com_loopbless_btf-factoring-manager]: https://github.com/loopbless/btf-factoring-manager