注入Http服务时Angular2 [typescript]错误

有问题的来源:https://github.com/clicman/angular2-app/

我试图将Http注入服务并导致错误:

http:1 Uncaught SyntaxError: Unexpected token <__exec @ system.src.js:1374entry.execute @
 system.src.js:3300linkDynamicModule @ system.src.js:2921link @ system.src.js:2764execute @
 system.src.js:3096doDynamicExecute @ system.src.js:715link @ system.src.js:908doLink @
 system.src.js:569updateLinkSetOnLoad @ system.src.js:617(anonymous function) @ system.src.js:430run @
 angular2-polyfills.js:138zoneBoundFn @ angular2-polyfills.js:111lib$es6$promise$$internal$$tryCatch @
 angular2-polyfills.js:1511lib$es6$promise$$internal$$invokeCallback @
 angular2-polyfills.js:1523lib$es6$promise$$internal$$publish @ angular2-polyfills.js:1494(anonymous
 function) @ angular2-polyfills.js:243run @ angular2-polyfills.js:138zoneBoundFn @
 angular2-polyfills.js:111lib$es6$promise$asap$$flush @ angular2-polyfills.js:1305 
angular2-polyfills.js:138 Uncaught SyntaxError: Unexpected token <
    Evaluating http://localhost:3000/angular2/src/http/http
    Error loading http://localhost:3000/scripts/boot.js

服务代码:

import {Injectable} from 'angular2/core'
import {Http} from 'angular2/src/http/http';
@Injectable()
export class CommentsService {
  constructor(private _http: Http) { }
  public getComments(): any[] {
    return [];
  }
}

我做错了什么？

你应该添加angular2/bundles/http.dev.js到index.html