'；WeakMap'；未使用Angular 4和Internet Explorer定义

我编写了我的第一个Angular 4应用程序，它在Chrome和Mozilla Firefox中运行良好

在10和11版本的Internet Explorer中都不起作用

我得到（SystemJS）引用错误：“WeakMap”未定义 在traspiled main.js上

这是我对外部javascript库和SystemJs配置的参考：

<script src="https://unpkg.com/es6-shim"></script>
<script src="https://unpkg.com/reflect-metadata"></script>
<script src="https://unpkg.com/zone.js?main=browser"></script>
<script src="https://unpkg.com/jquery"></script>
<script src="https://unpkg.com/systemjs@0.19.31/dist/system.js"></script>
<script>
    System.config({
        paths: {
            'npm:': 'https://unpkg.com/'
        },
        map: {
            // angular bundles
            '@angular/animations': 'npm:@angular/animations/bundles/animations.umd.js',
            '@angular/animations/browser': 'npm:@angular/animations/bundles/animations-browser.umd.js',
            '@angular/core': 'npm:@angular/core/bundles/core.umd.js',
            '@angular/common': 'npm:@angular/common/bundles/common.umd.js',
            '@angular/compiler': 'npm:@angular/compiler/bundles/compiler.umd.js',
            '@angular/platform-browser': 'npm:@angular/platform-browser/bundles/platform-browser.umd.js',
            '@angular/platform-browser/animations': 'npm:@angular/platform-browser/bundles/platform-browser-animations.umd.js',
            '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js',
            '@angular/http': 'npm:@angular/http/bundles/http.umd.js',
            '@angular/router': 'npm:@angular/router/bundles/router.umd.js',
            '@angular/router/upgrade': 'npm:@angular/router/bundles/router-upgrade.umd.js',
            '@angular/forms': 'npm:@angular/forms/bundles/forms.umd.js',
            '@angular/upgrade': 'npm:@angular/upgrade/bundles/upgrade.umd.js',
            '@angular/upgrade/static': 'npm:@angular/upgrade/bundles/upgrade-static.umd.js',
            '@ng-bootstrap/ng-bootstrap': 'npm:@ng-bootstrap/ng-bootstrap/bundles/ng-bootstrap.js',
            'rxjs': 'npm:rxjs@5.3.0',
        },
        packages: {
            '': {
                format: 'register',
                defaultExtension: 'js'
            }
        }
    });
    System.import('main.js').catch(function (err) { console.error(err); });
</script>

这是我的tsconfig.json配置

{
  "compileOnSave": true,
  "compilerOptions": {
    "noImplicitAny": false,
    "noEmitOnError": true,
    "removeComments": false,
    "sourceMap": true,
    "target": "es5",
    "module": "system",
    "moduleResolution": "node",
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "outDir": "./Scripts"
  },
  "exclude": [
    "node_modules"
  ]
}

我没有明确使用WeakMap。 我仅在应用程序的文件中使用此导入：

import { NgModule, enableProdMode } from '@angular/core';
import { Component, ViewEncapsulation } from '@angular/core';
import { Injectable } from '@angular/core';
import { Http, Headers, RequestOptions, RequestOptionsArgs } from '@angular/http';
import { BrowserModule } from '@angular/platform-browser';
import { HttpModule, JsonpModule } from '@angular/http';
import { FormsModule } from '@angular/forms';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { NgbModule } from '@ng-bootstrap/ng-bootstrap';
import $ from 'jquery';

---

谢谢你

我在IE10上遇到了这个问题。对我来说，它在IE11上确实有效。不管怎样，我包括了这个polyfill，至少这个页面是有效的——但还没有对它进行详尽的测试

---

Steve

看来IE 10和11不支持

WeakMap

。出于好奇，您能否与

WeakMap

分享您的用例？你可以用不同的方式设计你的应用程序。

import { NgModule, enableProdMode } from '@angular/core';
import { Component, ViewEncapsulation } from '@angular/core';
import { Injectable } from '@angular/core';
import { Http, Headers, RequestOptions, RequestOptionsArgs } from '@angular/http';
import { BrowserModule } from '@angular/platform-browser';
import { HttpModule, JsonpModule } from '@angular/http';
import { FormsModule } from '@angular/forms';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { NgbModule } from '@ng-bootstrap/ng-bootstrap';
import $ from 'jquery';