最可能的原因是在Zone.js之后加载了Promise polyfill(加载Zone.jss时不需要Polyfilli

Question

错误我得到

Error: Zone.js has detected that ZoneAwarePromise `(window|global).Promise` has been overwritten.
Most likely cause is that a Promise polyfill has been loaded after Zone.js (Polyfilling Promise api is not necessary when zone.js is loaded. If you must load one, do so before loading zone.js.)
at Function.push../node_modules/zone.js/dist/zone.js.Zone.assertZonePatched (zone.js:58)
at new NgZone (core.js:24212)
at getNgZone (core.js:24925)
at PlatformRef.push../node_modules/@angular/core/fesm5/core.js.PlatformRef.bootstrapModuleFactory (core.js:24823)
at core.js:24867
at exceljs.min.js:3
at MutationObserver.n (exceljs.min.js:3)
at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invoke (zone.js:391)
at Zone.push../node_modules/zone.js/dist/zone.js.Zone.runGuarded (zone.js:161)
at MutationObserver.<anonymous> (zone.js:144)

我发布了zone.js的一小部分，从那里我得到了这个错误

function Zone(parent, zoneSpec) {
this._parent = parent;
this._name = zoneSpec ? zoneSpec.name || 'unnamed' : '<root>';
this._properties = zoneSpec && zoneSpec.properties || {};
this._zoneDelegate =
new ZoneDelegate(this, this._parent && this._parent._zoneDelegate, zoneSpec);
}
Zone.assertZonePatched = function () {
if (global['Promise'] !== patches['ZoneAwarePromise']) {
throw new Error('Zone.js has detected that ZoneAwarePromise `(window|global).Promise` ' +
'has been overwritten.n' +
'Most likely cause is that a Promise polyfill has been loaded ' +
'after Zone.js (Polyfilling Promise api is not necessary when zone.js is loaded. ' +
'If you must load one, do so before loading zone.js.)');
}
};

引发了上述错误。我真的很难解决这个问题。

当我得到这个错误

我的项目中有一项任务是导出带有样式的excel表。我发现了一个名为exceljs的包。包括这之后，我开始得到这个错误。

exceljs.js自述文件中的一些相关文档

## ES5 Imports

要使用ES5传输的代码，请使用dist/ES5路径。

const ExcelJS = require('exceljs/dist/es5');

注意：ES5构建对许多不再是由exceljs显式添加。您需要将"core-js"one_answers"再生器运行时"添加到您的依赖项中在导入exceljs之前，在代码中包含以下要求：

// polyfills required by exceljs
require('core-js/modules/es.promise');
require('core-js/modules/es.object.assign');
require('core-js/modules/es.object.keys');
require('regenerator-runtime/runtime');
// ...
const ExcelJS = require('exceljs/dist/es5');

浏览

<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-polyfill/6.26.0/polyfill.js"></script>
<script src="exceljs.js"></script>

我正在使用es6。所以我所缺少的，请帮帮我。

角度版本详细信息

Angular CLI: 7.3.9
Node: 10.0.0
OS: linux x64
Angular: 8.0.0
... core
Package                             Version
-------------------------------------------------------------
@angular-devkit/architect           0.13.9
@angular-devkit/build-angular       0.13.9
@angular-devkit/build-optimizer     0.13.9
@angular-devkit/build-webpack       0.13.9
@angular-devkit/core                7.3.9
@angular-devkit/schematics          7.3.9
@angular/animations                 7.2.15
@angular/cdk                        8.1.4
@angular/cli                        7.3.9
@angular/common                     7.2.15
@angular/compiler                   7.2.15
@angular/compiler-cli               7.2.15
@angular/forms                      7.2.15
@angular/http                       7.2.15
@angular/language-service           7.2.15
@angular/material                   8.1.4
@angular/platform-browser           7.2.15
@angular/platform-browser-dynamic   7.2.15
@angular/router                     7.2.15
@ngtools/webpack                    7.3.9
@schematics/angular                 7.3.9
@schematics/update                  0.13.9
rxjs                                6.3.3
typescript                          3.2.4
webpack 

Answer 1

到您提出问题时，您可能已经弄清楚了。。。从您的polyfills.ts 中注释掉这一行

// import 'zone.js/dist/zone'; // Included with Angular CLI.