一个恶心的事情是：@angular/cli 生成的项目默认不能很好地支持IE，9/10/11都不行。
好消息是：@angular/cli默认生成了polyfill.ts文件，只要简单几个步骤就可以支持了。
第一步：用@angular/cli创建项目
ng new ie-test
cd ie-test
ng serve
打开你的chrome浏览器，访问http://localhost:4200，很顺利地访问到界面：
然后，打开IE，很自然地报错了：
仔细看报错信息，你就可以发现，这是因为IE不支持ES6里面给Array扩展的for…of循环导致的。
第二步：解决问题
打开@angular/cli自动生成的polyfill.ts文件，你可以看到这样的内容：
/** * 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/docs/ts/latest/guide/browser-support.html */
/*************************************************************************************************** * BROWSER POLYFILLS */
/** IE9,IE10 and IE11 requires all of the following polyfills. **/
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';
/** IE10 and IE11 requires the following for NgClass support on SVG elements */
import 'classlist.js'; // Run `npm install --save classlist.js`.
/** IE10 and IE11 requires the following for the Reflect API. */
import 'core-js/es6/reflect';
/** Evergreen browsers require these. **/
// Used for reflect-Metadata in JIT. If you use AOT (and only Angular decorators),you can remove.
import 'core-js/es7/reflect';
/** * required to support Web Animations `@angular/platform-browser/animations`. * Needed for: All but Chrome,Firefox and Opera. http://caniuse.com/#feat=web-animation **/
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 */
// (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__BLACK_LISTED_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 */
对于这一坨import在干什么，你仔细看每一行代码后面的注释就知道了。
这里有一个小注意点，有两个依赖需要你手动安装：
npm install --save classlist.js
npm install --save web-animations-js
装完之后重新：
ng serve
然后你就可以在IE里面哈皮地看自己的界面了：
