@angular/cli：如何让@angular/cli生成的项目兼容IE9/10/11？

逃离我推掉我的手 2022-05-27 09:50 77阅读 0赞

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，很顺利地看到以下界面：

[![0\_1523866815612\_2.png][0_1523866815612_2.png]][0_1523866815612_2.png]

然后，打开IE，很自然地报错了：

[![0\_1523866825364\_3.png][0_1523866825364_3.png]][0_1523866825364_3.png]

[![0\_1523866833474\_4.png][0_1523866833474_4.png]][0_1523866833474_4.png]

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。

浏览器对ES6的支持程度，你可以在[MDN][]上查到详细的信息：

[![0\_1523866847376\_5.png][0_1523866847376_5.png]][0_1523866847376_5.png]

### 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里面哈皮地看到这个了：

[![0\_1523866855342\_6.png][0_1523866855342_6.png]][0_1523866855342_6.png]

[0_1523866815612_2.png]: http://www.ngfans.net/assets/uploads/files/1523866817005-2.png
[0_1523866825364_3.png]: http://www.ngfans.net/assets/uploads/files/1523866826351-3.png
[0_1523866833474_4.png]: http://www.ngfans.net/assets/uploads/files/1523866835294-4.png
[MDN]: http://www.ngfans.net/topic/200/post/%5Clocalhost:4200
[0_1523866847376_5.png]: http://www.ngfans.net/assets/uploads/files/1523866848584-5.png
[0_1523866855342_6.png]: http://www.ngfans.net/assets/uploads/files/1523866858717-6.png