编译 Can't resolve 'core-js/es6/array' Can't resolve 'core-js/es6/date'

[ng] ERROR in ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/es2015-polyfills.js
[ng] Module not found: Error: Can't resolve 'core-js/es6/array' in 'D:\D\e-commerce\node_modules\@angular-devkit\build-angular\src\angular-cli-files\models'
[ng] ERROR in ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/es2015-polyfills.js
[ng] Module not found: Error: Can't resolve 'core-js/es6/date' in 'D:\D\e-commerce\node_modules\@angular-devkit\build-angular\src\angular-cli-files\models'
[ng] ERROR in ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/es2015-polyfills.js
[ng] Module not found: Error: Can't resolve 'core-js/es6/function' in 'D:\D\e-commerce\node_modules\@angular-devkit\build-angular\src\angular-cli-files\models'
[ng] ERROR in ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/es2015-polyfills.js
[ng] Module not found: Error: Can't resolve 'core-js/es6/map' in 'D:\D\e-commerce\node_modules\@angular-devkit\build-angular\src\angular-cli-files\models'
[ng] ERROR in ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/es2015-polyfills.js
[ng] Module not found: Error: Can't resolve 'core-js/es6/math' in 'D:\D\e-commerce\node_modules\@angular-devkit\build-angular\src\angular-cli-files\models'
[ng] ERROR in ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/es2015-polyfills.js
[ng] Module not found: Error: Can't resolve 'core-js/es6/number' in 'D:\D\e-commerce\node_modules\@angular-devkit\build-angular\src\angular-cli-files\models'
[ng] ERROR in ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/es2015-polyfills.js
[ng] Module not found: Error: Can't resolve 'core-js/es6/object' in 'D:\D\e-commerce\node_modules\@angular-devkit\build-angular\src\angular-cli-files\models'
[ng] ERROR in ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/es2015-polyfills.js
[ng] Module not found: Error: Can't resolve 'core-js/es6/parse-float' in 'D:\D\e-commerce\node_modules\@angular-devkit\build-angular\src\angular-cli-files\models'
[ng] ERROR in ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/es2015-polyfills.js
[ng] Module not found: Error: Can't resolve 'core-js/es6/parse-int' in 'D:\D\e-commerce\node_modules\@angular-devkit\build-angular\src\angular-cli-files\models'
[ng] ERROR in ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/es2015-jit-polyfills.js
[ng] Module not found: Error: Can't resolve 'core-js/es6/reflect' in 'D:\D\e-commerce\node_modules\@angular-devkit\build-angular\src\angular-cli-files\models'
[ng] ERROR in ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/es2015-polyfills.js
[ng] Module not found: Error: Can't resolve 'core-js/es6/regexp' in 'D:\D\e-commerce\node_modules\@angular-devkit\build-angular\src\angular-cli-files\models'
[ng] ERROR in ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/es2015-polyfills.js
[ng] Module not found: Error: Can't resolve 'core-js/es6/set' in 'D:\D\e-commerce\node_modules\@angular-devkit\build-angular\src\angular-cli-files\models'
[ng] ERROR in ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/es2015-polyfills.js
[ng] Module not found: Error: Can't resolve 'core-js/es6/string' in 'D:\D\e-commerce\node_modules\@angular-devkit\build-angular\src\angular-cli-files\models'
[ng] ERROR in ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/es2015-polyfills.js
[ng] Module not found: Error: Can't resolve 'core-js/es6/symbol' in 'D:\D\e-commerce\node_modules\@angular-devkit\build-angular\src\angular-cli-files\models'
[ng] ERROR in ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/es2015-polyfills.js
[ng] Module not found: Error: Can't resolve 'core-js/es6/weak-map' in 'D:\D\e-commerce\node_modules\@angular-devkit\build-angular\src\angular-cli-files\models'
[ng] ERROR in ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/jit-polyfills.js
[ng] Module not found: Error: Can't resolve 'core-js/es7/reflect' in 'D:\D\e-commerce\node_modules\@angular-devkit\build-angular\src\angular-cli-files\models'

在package.json文件中将core-js的版本由‘2.5.4’或者'3.0.0'改为'2.5.7'

找到polyfills.ts

/**
 * This file includes polyfills needed by Angular and is loaded before the app.
 * You can add your own extra polyfills to this file.
 *
 * This file is divided into 2 sections:
 *   1. Browser polyfills. These are applied before loading ZoneJS and are sorted by browsers.
 *   2. Application imports. Files imported after ZoneJS that should be loaded before your main
 *      file.
 *
 * The current setup is for so-called "evergreen" browsers; the last versions of browsers that
 * automatically update themselves. This includes Safari >= 10, Chrome >= 55 (including Opera),
 * Edge >= 13 on the desktop, and iOS 10 and Chrome on mobile.
 *
 * Learn more in https://angular.io/guide/browser-support
 */

/***************************************************************************************************
 * BROWSER POLYFILLS
 */

/** IE10 and IE11 requires the following for NgClass support on SVG elements */
// import 'classlist.js';  // Run `npm install --save classlist.js`.
import 'core-js/es6/symbol';
import 'core-js/es6/object';
import 'core-js/es6/function';
import 'core-js/es6/parse-int';
import 'core-js/es6/parse-float';
import 'core-js/es6/number';
import 'core-js/es6/math';
import 'core-js/es6/string';
import 'core-js/es6/date';
import 'core-js/es6/array';
import 'core-js/es6/regexp';
import 'core-js/es6/map';
import 'core-js/es6/weak-map';
import 'core-js/es6/set';

import 'classlist.js'; // Run `npm install --save classlist.js`.
import 'core-js/es6/reflect';
import 'core-js/es7/reflect';
import 'web-animations-js';  // Run `npm install --save web-animations-js`.
/**
 * Web Animations `@angular/platform-browser/animations`
 * Only required if AnimationBuilder is used within the application and using IE/Edge or Safari.
 * Standard animation support in Angular DOES NOT require any polyfills (as of Angular 6.0).
 */
// import 'web-animations-js';  // Run `npm install --save web-animations-js`.

/**
 * By default, zone.js will patch all possible macroTask and DomEvents
 * user can disable parts of macroTask/DomEvents patch by setting following flags
 * because those flags need to be set before `zone.js` being loaded, and webpack
 * will put import in the top of bundle, so user need to create a separate file
 * in this directory (for example: zone-flags.ts), and put the following flags
 * into that file, and then add the following code before importing zone.js.
 * import './zone-flags.ts';
 *
 * The flags allowed in zone-flags.ts are listed here.
 *
 * The following flags will work for all browsers.
 *
 * (window as any).__Zone_disable_requestAnimationFrame = true; // disable patch requestAnimationFrame
 * (window as any).__Zone_disable_on_property = true; // disable patch onProperty such as onclick
 * (window as any).__zone_symbol__UNPATCHED_EVENTS = ['scroll', 'mousemove']; // disable patch specified eventNames
 *
 *  in IE/Edge developer tools, the addEventListener will also be wrapped by zone.js
 *  with the following flag, it will bypass `zone.js` patch for IE/Edge
 *
 *  (window as any).__Zone_enable_cross_context_check = true;
 *
 */

/***************************************************************************************************
 * Zone JS is required by default for Angular itself.
 */
import 'zone.js/dist/zone';  // Included with Angular CLI.


/***************************************************************************************************
 * APPLICATION IMPORTS
 */

cnpm install --save classlist.js

cnpm install --save web-animations-js