javascript - angular 6 自定义元素在 IE11 和 Firefox 上失败，出现语法和影子 dom 错误

Question

我创建了一个新的 angular-cli 项目，其中包含一个使用 these directions 的自定义元素.它在 Chrome 上完美运行。我已经在 Internet Explorer 的所有必要的 polyfill 中进行了评论。

我已经包含了额外的 @webcomponents/...但是 @webcomponents 导致了问题!

node_modules/@webcomponents/custom-elements/src/native-shim.js包含箭头函数，Internet Explorer 不支持该函数，因此出现以下错误:

Syntax Error
If anyone can point me to an angular-cli demo / repo (with custom elements) anywhere that compiles and works on IE11 that would be a huge help!

 // `node_modules/@webcomponents/custom-elements/src/native-shim.js`
 *  Compiling valid class-based custom elements to ES5 will satisfy these
 *  requirements with the latest version of popular transpilers.
 */
(() => { // THIS IS NOT ACTUALLY LEGAL IN IE
  'use strict';

  // Do nothing if `customElements` does not exist.
  if (!window.customElements) return;

我的完整 polyfill 如下所示:

/***************************************************************************************************
 * 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';


/**
 * 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
 */

 // (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.

import '@webcomponents/custom-elements/custom-elements.min';
import '@webcomponents/custom-elements/src/native-shim';
import 'bluebird';

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

Answer 1

https://github.com/sulco/angular-6-web-components/pull/2

伙计，这让我在过去 2 天里恢复了理智，点击并祝福 ;D

基本上，这个人从组件中移除了 Native 封装，并以明显正确的方式使用了 polyfill，这是我自己无法确定的。

如果您 checkout 此拉取请求，请运行 npm install、npm run build、npm run package 和 npm run serve，所有这些都应该适用于 Chrome、FF 和 IE11(至少适用于我)。