angular2（一）环境搭建

关于angular2的环境搭建的帖子到处都是，但跟着一步一步操作，没几个是可以跑的起来的。 如果是老油条则不需要看这种帖子，看这种帖子都是第一次搭建，如果有错误就让新手束手无策了，至少我都花了几个小时才跑出第一个例子：这里我们不采用webpack，下节我们再用webpack结合angular2来搭建一次。 创建配置文件 Angular 项目需要以下几个配置文件： package.json 标记本项目所需的 npm 依赖包。 tsconfig.json 定义了 TypeScript 编译器如何从项目源文件生成 JavaScript 代码。 typings.json为那些 TypeScript 编译器无法识别的库提供了额外的定义文件。 systemjs.config.js 为模块加载器提供了该到哪里查找应用模块的信息，并注册了所有必备的依赖包。 package.json 文件

{ "name": "angular-quickstart", "version": "1.0.0", "scripts": { "start": "tsc && concurrently \"npm run tsc:w\" \"npm run lite\" ", "lite": "lite-server", "postinstall": "typings install", "tsc": "tsc", "tsc:w": "tsc -w", "typings": "typings" }, "license": "ISC", "dependencies": { "@angular/common": "2.0.0", "@angular/compiler": "2.0.0", "@angular/core": "2.0.0", "@angular/forms": "2.0.0", "@angular/http": "2.0.0", "@angular/platform-browser": "2.0.0", "@angular/platform-browser-dynamic": "2.0.0", "@angular/router": "3.0.0", "@angular/upgrade": "2.0.0", "core-js": "^2.4.1", "reflect-metadata": "^0.1.3", "rxjs": "5.0.0-beta.12", "systemjs": "0.19.27", "zone.js": "^0.6.23", "angular2-in-memory-web-api": "0.0.20", "bootstrap": "^3.3.6" }, "devDependencies": { "concurrently": "^2.2.0", "lite-server": "^2.2.2", "typescript": "2.3.4", "typings":"^1.3.2" } }

这文件是从这里写链接内容复制过来的，但本人做过修改，如果不修改的话，在npm start会报错误，这个错误都折磨了我半天，其实就是将

"typescript": "^2.0.2",

修改成

"typescript": "2.3.4",

tsconfig.json

{ "compilerOptions": { "target": "es5", "module": "commonjs", "moduleResolution": "node", "sourceMap": true, "emitDecoratorMetadata": true, "experimentalDecorators": true, "removeComments": false, "noImplicitAny": false } }

typings.json

{ "globalDependencies": { "core-js": "registry:dt/core-js#0.0.0+20160725163759", "jasmine": "registry:dt/jasmine#2.2.0+20160621224255", "node": "registry:dt/node#6.0.0+20160909174046" } }

systemjs.config.js 文件：

/** * System configuration for Angular samples * Adjust as necessary for your application needs. */ (function (global) { System.config({ paths: { // paths serve as alias 'npm:': 'node_modules/' }, // map tells the System loader where to look for things map: { // our app is within the app folder app: 'app', // angular bundles '@angular/core': 'npm:@angular/core/bundles/core.umd.js', '@angular/common': 'npm:@angular/common/bundles/common.umd.js', '@angular/compiler': 'npm:@angular/compiler/bundles/compiler.umd.js', '@angular/platform-browser': 'npm:@angular/platform-browser/bundles/platform-browser.umd.js', '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js', '@angular/http': 'npm:@angular/http/bundles/http.umd.js', '@angular/router': 'npm:@angular/router/bundles/router.umd.js', '@angular/forms': 'npm:@angular/forms/bundles/forms.umd.js', // other libraries 'rxjs': 'npm:rxjs', 'angular2-in-memory-web-api': 'npm:angular2-in-memory-web-api', }, // packages tells the System loader how to load when no filename and/or no extension packages: { app: { main: './main.js', defaultExtension: 'js' }, rxjs: { defaultExtension: 'js' }, 'angular2-in-memory-web-api': { main: './index.js', defaultExtension: 'js' } } }); })(this);

然后在 app 目录下创建 app.module.ts 文件，代码如下所示： app.module.ts 文件：

import { NgModule } from '@angular/core'; import { BrowserModule } from '@angular/platform-browser'; @NgModule({ imports: [ BrowserModule ] }) export class AppModule { }

然后在 app 目录下创建app.component.ts 文件：

import { Component } from '@angular/core'; @Component({ selector: 'my-app', template: '<h1>我的第一个 Angular 应用</h1>' }) export class AppComponent { }

然后在 app 目录下创建app.module.ts 文件：

import { NgModule } from '@angular/core'; import { BrowserModule } from '@angular/platform-browser'; import { AppComponent } from './app.component'; @NgModule({ imports: [ BrowserModule ], declarations: [ AppComponent ], bootstrap: [ AppComponent ] }) export class AppModule { }

app 目录下创建 main.ts 文件，代码如下所示：

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic'; import { AppModule } from './app.module'; const platform = platformBrowserDynamic(); platform.bootstrapModule(AppModule);

跟目录下创建 index.html 文件，代码如下所示：

index.html 文件：

<html> <head> <title>Angular 2 实例 - 菜鸟教程(runoob.com)</title> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="styles.css"> <!-- 1. 载入库 --> <!-- IE 需要 polyfill --> <script src="node_modules/core-js/client/shim.min.js"></script> <script src="node_modules/zone.js/dist/zone.js"></script> <script src="node_modules/reflect-metadata/Reflect.js"></script> <script src="node_modules/systemjs/dist/system.src.js"></script> <!-- 2. 配置 SystemJS --> <script src="systemjs.config.js"></script> <script> System.import('app').catch(function(err){ console.error(err); }); </script> </head> <!-- 3. 显示应用 --> <body> <my-app>Loading...</my-app> </body> </html>

目录解构如下：

编译并运行应用程序 打开终端窗口，输入以下命令：

npm start

访问 http://localhost:3000/，浏览器显示结果为：