如何将全局声明的模块映射到angular2中的项目？

例如，我在全球范围内安装了一系列软件包

@角/芯

@角度/Http

在文件夹C:\Users\user\AppData\Roaming\npm\node\u modules中

但是，我无法映射systemjs.config.js文件中的所有全局包，我该怎么做？下面是我的systemjs.config.js文件

(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);

我试着换衣服

paths: {
          // paths serve as alias
          'npm:': 'node_modules/'
        }

到

---

但我仍然收到一个错误，声明@angular/core not found

我的父文件夹中有package.json，全局位置中有node_modules文件夹是的，你能回答我的问题吗请首先理解我的问题，我已经设置了我的项目，我已经全局安装了我的包，所以我只想知道，如何映射一个全局安装的库那么，npm install-g@angular/core这个命令有什么用呢？这将在C:/Users/lijin662330/AppData/Roaming/npm/node_modules/folder path中安装程序包，对吗？如果您不知道答案，请不要发表评论

 paths: {
              // paths serve as alias
              'npm:': C:/Users/lijin662330/AppData/Roaming/npm/node_modules/'
            }