我遵循了教程。在更改app/maint.tsHttp章后，通过命令行启动应用程序时出现错误：
app / main.ts（5,51）：错误TS2307：找不到模块“ angular2-in-memory-web-api”。
（Visual Studio Code在main.ts中给了我相同的错误-红色波浪下划线。）
这是我的systemjs.config.js：
/**
* System configuration for Angular 2 samples
* Adjust as necessary for your application needs.
*/
(function(global) {
// map tells the System loader where to look for things
var map = {
'app': 'app', // 'dist',
'@angular': 'node_modules/@angular',
'angular2-in-memory-web-api': 'node_modules/angular2-in-memory-web-api',
'rxjs': 'node_modules/rxjs'
};
// packages tells the System loader how to load when no filename and/or no extension
var packages = {
'app': { main: 'main.js', defaultExtension: 'js' },
'rxjs': { defaultExtension: 'js' },
'angular2-in-memory-web-api': { defaultExtension: 'js' },
};
var ngPackageNames = [
'common',
'compiler',
'core',
'http',
'platform-browser',
'platform-browser-dynamic',
'router',
'router-deprecated',
'upgrade',
];
// Add package entries for angular packages
ngPackageNames.forEach(function(pkgName) {
packages['@angular/'+pkgName] = { main: pkgName + '.umd.js', defaultExtension: 'js' };
});
var config = {
map: map,
packages: packages
}
System.config(config);
})(this);
这是我的app/main.ts：
// Imports for loading & configuring the in-memory web api
import { provide } from '@angular/core';
import { XHRBackend } from '@angular/http';
import { InMemoryBackendService, SEED_DATA } from 'angular2-in-memory-web-api';
import { InMemoryDataService } from './in-memory-data.service';
// The usual bootstrapping imports
import { bootstrap } from '@angular/platform-browser-dynamic';
import { HTTP_PROVIDERS } from '@angular/http';
import { AppComponent } from './app.component';
bootstrap(AppComponent, [
HTTP_PROVIDERS,
provide(XHRBackend, { useClass: InMemoryBackendService }), // in-mem server
provide(SEED_DATA, { useClass: InMemoryDataService }) // in-mem server data
]);
'angular2-in-memory-web-api': { main: 'index.js', defaultExtension: 'js' }在systemjs.config.js文件中指定（请参阅@GrantTaylor的回答）。