Question

我遇到错误

RepositoryFactory.getRepository(DeviceModelRepo.class)

我从发生此错误的地方粘贴了zone.js的一小部分

            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)

抛出以上错误。我确实在努力解决这个问题。

出现此错误

在我的项目中，我有一个任务是导出具有样式的Excel工作表。我找到了一个名为exceljs的软件包。包括这个之后，我开始收到此错误。

exceljs.js自述文件中的一些相关文档

     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.)');
            }
        };

要使用ES5转换代码，请使用dist / es5路径。

## ES5 Imports

注意：：ES5版本对许多不再使用的polyfill具有隐式依赖性由exceljs明确添加。您需要将“ core-js”和“ regenerator-runtime”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：

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

浏览化

// 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');

我正在使用es6。所以我想念的是。请帮帮我。

角度版本详细信息。

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

Answer 1

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

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

最可能的原因是在Zone.js之后加载了Promise polyfill（在加载zone.js时无需填充Promise api）

1 个答案: