Angular2 tutorial HTTP 的怪問題。

日期：
在照著 Angular 2 官方的tutorial 教學練習的時候，在Chapter 7 Http 一開始設定好 in-memory-data.service.ts 與 app.module.ts之後，原本我們寫死的moch-heroes資料轉成透過 http 跟memory拿資料的方法會失敗！會出現下列的錯誤訊息：
GET http://localhost:3000/traceur 404 (Not Found)
Error: (SystemJS) XHR error (404 Not Found) loading http://localhost:3000/traceur
    Error: XHR error (404 Not Found) loading http://localhost:3000/traceur
        at XMLHttpRequest.wrapFn [as _onreadystatechange] (http://localhost:3000/node_modules/zone.js/dist/zone.js:698:29)
        at ZoneDelegate.invokeTask (http://localhost:3000/node_modules/zone.js/dist/zone.js:265:35)
        at Zone.runTask (http://localhost:3000/node_modules/zone.js/dist/zone.js:154:47)
        at XMLHttpRequest.ZoneTask.invoke (http://localhost:3000/node_modules/zone.js/dist/zone.js:335:33)





問題主要是出在 angular-in-memory-web-api 所以要修改：


  1.  systemjs.config.js 內將angular-in-memory-web-api改成 angular2-in-memory-web-api 
    /**
 * 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);
  2. package.json 內將 angular-in-memory-web-api 改成 angular2-in-memory-web-api 版本改成0.0.21(我當時的最新版) 
    {
    "name": "angular-quickstart",
    "version": "1.0.0",
    "scripts":{
        "start": "tsc && concurrently \"tsc -w\" \"lite-server\" ",
        "lite": "lite-server",
        "tsc": "tsc",
        "tsc:w": "tsc -w"
    },
    "licenses": [
        {
          "type": "MIT",
          "url": "https://github.com/angular/angular.io/blob/master/LICENSE"
        }
    ],
    "dependencies": {
        "@angular/common": "~2.1.1",
        "@angular/compiler": "~2.1.1",
        "@angular/core": "~2.1.1",
        "@angular/forms": "~2.1.1",
        "@angular/http": "~2.1.1",
        "@angular/platform-browser": "~2.1.1",
        "@angular/platform-browser-dynamic": "~2.1.1",
        "@angular/router": "~3.1.1",
        "@angular/upgrade": "~2.1.1",
        "angular2-in-memory-web-api": "~0.0.21",
        "bootstrap": "^3.3.7",
        "core-js": "^2.4.1",
        "reflect-metadata": "^0.1.8",
        "rxjs": "5.0.0-beta.12",
        "systemjs": "0.19.39",
        "zone.js": "^0.6.25"
    },
    "devDependencies": {
        "@types/core-js": "^0.9.34",
        "@types/node": "^6.0.45",
        "concurrently": "^3.0.0",
        "lite-server": "^2.2.2",
        "typescript": "^2.0.3"
    }
}
  3. app.module.ts 內把導入 angular-in-memory-web-api 改成： 
    import { InMemoryWebApiModule } from 'angular2-in-memory-web-api';
接著下npm install 來安裝angular2-in-memory-web-api就可以正常使用npm start解決這個錯誤。

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