只有在Angular2中发布的协议方案才支持跨源请求

Question

我试图完成角快速入门教程，但我得到了CORS错误。

我在windows主机文件中的system32/drivers/etc/下配置了此主机：

127.0.0.1       tour-of-heroes

我在apache中配置了这个虚拟主机

<VirtualHost *:80>
    DocumentRoot "xxxxxxxxxxx/tour-of-heroes"
    ServerName tour-of-heroes
    <Directory />
        DirectoryIndex index.html
        AllowOverride All
        Order Deny,Allow
        Deny from all
        Allow from 127.0.0.1
    </Directory>
</VirtualHost>

system.src.js:1049 XMLHttpRequest cannot load npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js. Cross origin requests are only supported for protocol schemes: http, data, chrome, chrome-extension, https, chrome-extension-resource.fetchTextFromURL @ system.src.js:1049(anonymous function) @ system.src.js:1555(anonymous function) @ system.src.js:1554(anonymous function) @ system.src.js:2446(anonymous function) @ system.src.js:3011(anonymous function) @ system.src.js:3244(anonymous function) @ system.src.js:3840(anonymous function) @ system.src.js:4031(anonymous function) @ system.src.js:4277(anonymous function) @ system.src.js:326run @ zone.js:115zoneBoundFn @ zone.js:88
(index):16 Error: XHR error loading npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js(…)(anonymous function) @ (index):16run @ zone.js:115zoneBoundFn @ zone.js:88run @ zone.js:115zoneBoundFn @ zone.js:88
system.src.js:1049 XMLHttpRequest cannot load npm:@angular/core/bundles/core.umd.js. Cross origin requests are only supported for protocol schemes: http, data, chrome, chrome-extension, https, chrome-extension-resource.fetchTextFromURL @ system.src.js:1049(anonymous function) @ system.src.js:1555(anonymous function) @ system.src.js:1554(anonymous function) @ system.src.js:2446(anonymous function) @ system.src.js:3011(anonymous function) @ system.src.js:3244(anonymous function) @ system.src.js:3840(anonymous function) @ system.src.js:4031(anonymous function) @ system.src.js:4277(anonymous function) @ system.src.js:326run @ zone.js:115zoneBoundFn @ zone.js:88
system.src.js:1049 XMLHttpRequest cannot load npm:@angular/platform-browser/bundles/platform-browser.umd.js. Cross origin requests are only supported for protocol schemes: http, data, chrome, chrome-extension, https, chrome-extension-resource.fetchTextFromURL @ system.src.js:1049(anonymous function) @ system.src.js:1555(anonymous function) @ system.src.js:1554(anonymous function) @ system.src.js:2446(anonymous function) @ system.src.js:3011(anonymous function) @ system.src.js:3244(anonymous function) @ system.src.js:3840(anonymous function) @ system.src.js:4031(anonymous function) @ system.src.js:4277(anonymous function) @ system.src.js:326run @ zone.js:115zoneBoundFn @ zone.js:88
system.src.js:291 Assertion failed: loading or loaded

null

/**
 * 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: 'js/tour-of-heroes2',
      // 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',
      //'angular-in-memory-web-api': 'npm:angular-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'
      },
      /*'angular-in-memory-web-api': {
        main: './index.js',
        defaultExtension: 'js'
      }*/
    }
  });
})(this);

这是我的package.json：

{
  "name": "AngularJS2",
  "version": "1.0.0",
  "author": "author",
  "description": "Project Tour of Heroes",
  "scripts": {
    "postinstall": "typings install"
  },
  "dependencies": {
    "@angular/common": "~2.1.0",
    "@angular/compiler": "~2.1.0",
    "@angular/core": "~2.1.0",
    "@angular/forms": "~2.1.0",
    "@angular/http": "~2.1.0",
    "@angular/platform-browser": "~2.1.0",
    "@angular/platform-browser-dynamic": "~2.1.0",
    "@angular/router": "~3.1.0",
    "@angular/upgrade": "~2.1.0",

    "core-js": "^2.4.1",
    "reflect-metadata": "0.1.2",
    "rxjs": "5.0.0-beta.0",
    "systemjs": "0.19.6",
    "zone.js": "0.5.10",
    "es6-promise": "^3.0.2",
    "es6-shim": "^0.33.3",
    "bootstrap": "^3.3.6"
  },
  "devDependencies": {
    "grunt": "^0.4.5",
    "grunt-concurrent": "^2.0.3",
    "grunt-contrib-copy": "^0.8.1",
    "grunt-contrib-jshint": "^0.11.3",
    "grunt-ts": "^5.5.0-beta.2",
    "load-grunt-config": "^0.17.2",
    "jshint-stylish": "^2.0.1",
    "time-grunt": "^1.2.1",
    "typings":"^1.4.0"
  }
}

这是我的index.html：

<html>
  <head>
    <title>Angular QuickStart</title>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <!--<link rel="stylesheet" href="styles.css">-->
    <!-- 1. Load libraries -->
     <!-- Polyfill(s) for older browsers -->
    <script src="node_modules/core-js/client/shim.min.js"></script>
    <script src="node_modules/zone.js/dist/zone.js"></script>
    <script src="node_modules/reflect-metadata/Reflect.js"></script>
    <script src="node_modules/systemjs/dist/system.src.js"></script>
    <!-- 2. Configure SystemJS -->
    <script src="systemjs.config.js"></script>
    <script>
      System.import('app').catch(function(err){ console.error(err); });
    </script>
  </head>
  <!-- 3. Display the application -->
  <body>
    <my-app>Loading...</my-app>
  </body>
</html>

这是我的grunt ts编译器文件：

module.exports = {
    base: {
        src: ['src/**/*.ts'],
        dest: 'js/tour-of-heroes/',
        options: {
            module: 'system', //or commonjs
            moduleResolution: 'node',
            target: 'es2015', //or es3 
            sourceMap: true,
            declaration: true,
            emitDecoratorMetadata: true,
            experimentalDecorators: true,
            removeComments: false,
            noImplicitAny: false
        }
    }
};

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { AppModule } from './app.module';

const platform = platformBrowserDynamic();
platform.bootstrapModule(AppModule);

import { NgModule }      from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent }   from './app.component';

@NgModule({
  imports:      [ BrowserModule ],
  declarations: [ AppComponent ],
  bootstrap:    [ AppComponent ]
})

export class AppModule { }

import { Component } from '@angular/core';
@Component({
  selector: 'my-app',
  template: '<h1>My First Angular App</h1>'
})
export class AppComponent { }

Answer 1

SystemJS仅在0.19.30更新的版本中支持Paths属性。更新您的SystemJS包或停止使用Paths属性，如Michael Desigaud的回答所述。