Angular2快速起步——构建一个简单的应用

{  "name": "angular2-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": "^2.0.2",    "typings":"^1.3.2" 
        }
}

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

/**
 * System configuration for Angular 2 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);

3、安装依赖包

在终端定位到package.json的位置，直接npm install

在安装期间可能出现红色的错误信息，你还会看到npm WARN信息。不过不用担心，只要末尾处没有npm ERR!信息就算成功了。

你应该得到如下结构：

如果在运行npm install之后没有出现typings目录，我们可以手动安装它

npm run typings install

创建应用

在应用的根目录下创建app子目录，在app子目录下创建app.module.ts文件

app.module.ts

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

这里是应用的入口点，由于应用是运行在浏览器中的，所以根模块需要从@angular/platform-browser中导入BrowserModule并添加到imports数组中，这是要让最小的应用在浏览器中运行时，对Angular的最低需求。

创建组件并添加到应用中

每个Angular应用都至少有一个组件：根组件，这里叫AppComponent，组件是Angular应用的基本构造块，每个组件都会通过与它相关的模块来控制屏幕上的一小块，在app文件夹下创建app.component.ts

app.component.ts

import { Component } from '@angular/core';
@Component({
selector: 'my-app',
template: '<h1>My First Angular App</h1>'
})
export class AppComponent { }

import语句。它让你能访问Angular核心库中的@Component装饰器函数。

@Component装饰器，它会把一份元数据关联到AppComponent组件类上：

selector为用来代表该组件的HTML元素指定简单的CSS选择器。

template用来告诉Angular如何渲染该组件的视图。

我们还要导出AppComponent类，以便让刚刚创建的这个应用导入它

编辑app/app.module.ts文件，导入这个新的AppComponent，并把它添加到NgModule装饰器中的declarations和bootstrap字段：

app.module.ts

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 { }

启动应用

在app文件夹下创建新文件main.ts

main.ts

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

定义该应用的宿主页面

在quickstart文件夹下创建index.html文件

index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Angular Quickstart</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <!-- 1. Load libraries -->
    <!-- Polyfill(s) for older browsers -->
    <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. Configure SystemJS -->
    <script src="systemjs.config.js"></script>
    <script>
        System.import('app').catch(function(err){ console.error(err); });
    </script>
</head>
<body>
<my-app>Loading...</my-app>
</body>
</html>

编译并运行应用程序

打开终端，定位到该目录，npm start

稍后，一个浏览器页标签就会打开并显示出来。

posted @ 2017-03-14 11:18 freeah 阅读(614) 评论(0) 编辑收藏举报

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freeah

Angular2快速起步——构建一个简单的应用

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