Angular2材质设计alpha.9-3有'404 not found'@angular /材料

我已经按照angular material2 Getting Started中的说明安装了@angular/material。通过Atom，我更新了包。除了入门指南之外，我还更新了systemjs. json、app.module。'@angular/material':'node_modules/@angular/material'，

zone.js:1274 get http://localhost:3000/node_modules/@angular/material/404 (Not Found)

(SystemJS) XHR错误(404 Not Found)加载http://localhost:3000/node_modules/@angular/material(…)

我相信我已经追踪到这个问题，许多@angular文件夹有一个包含umd文件的bundle子文件夹，但@angular/material文件夹没有bundle子文件夹。因此，'unpacking'函数找不到@angular/material/material.umd.js

systemjs在我的舒适区之外，所以我不确定上面的内容，但是我无法用alpha的新文件结构解决404问题。9-3以下是相关代码(其他组件未显示)

package.json

 "@angular/material": "2.0.0-alpha.9-3",

app.module

 import { MaterialModule } from '@angular/material';
 @NgModule({
  imports: MaterialModule.forRoot(),

systemjs.config

  (function(global) {
    var map = {
      'app': 'app',
      // angular bundles
      '@angular':                   'node_modules/@angular',
      // other libraries
      'angular2-in-memory-web-api': 'node_modules/angular2-in-memory-web-api',
      'rxjs':                       'node_modules/rxjs',
      '@angular/material': 'node_modules/@angular/material',
    };
    var packages = {
      'app': { main: 'main.js',  defaultExtension: 'js' },
      'rxjs':{ defaultExtension: 'js' },
      'angular2-in-memory-web-api': { main: 'index.js', defaultExtension: 'js' },
    };
    var ngPackageNames = [
     'common',
     'compiler',
     'core',
     'forms',
     'http',
     'platform-browser',
     'platform-browser-dynamic',
     'platform-server',
     'router',
     'upgrade',
    ]; //adding 'material' to the array causes a different 404 error
    function packIndex(pkgName) {
      packages['@angular/'+pkgName] = { main: 'index.js', defaultExtension: 'js' };
    }
    function packUmd(pkgName) {
      packages['@angular/'+pkgName] = { main: 'bundles/' + pkgName + '.umd.js', defaultExtension: 'js' };
    }
    var setPackageConfig = System.packageWithIndex ? packIndex : packUmd;
    ngPackageNames.forEach(setPackageConfig); 
    var config = {
      map: map,
      packages: packages
    };
    System.config(config);
  })(this); //end of function(global)

我检查了我的文件夹/文件结构，@angular/material/material.umd.js肯定在那里。我如何摆脱404未找到?

var ngPackageNames = [
 ...
 'material'
];

function packUmd(pkgName) {
   packages['@angular/'+pkgName] = { 
     main: (pkgName !== 'material' ? 'bundles/' : '') + pkgName + '.umd.js', 
     defaultExtension: 'js' 
   };
}

(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',
      '@angular/animations': 'npm:@angular/animations/bundles/animations.umd.js',
      '@angular/animations/browser': 'npm:@angular/animations/bundles/animations-browser.umd.js',
      '@angular/platform-browser/animations': 'npm:@angular/platform-browser/bundles/platform-browser-animations.umd.js',
      '@angular/material': 'npm:@angular/material/bundles/material.umd.js'
      // other libraries
      'rxjs':                       'npm:rxjs'
    },
    // 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'
      }
    }
  });
})(this);