我已经使用 Angular 8 和 cli 使用“ng new repro-app2”创建了一个应用程序。 问题出现时，在包含 moment.js 模块或 popper.js 模块后，我从我的电脑运行“ngserve”以在本地提供应用程序( http://localhost:4200/ )。 浏览器(firefox 和 chrome)的控制台抛出此错误:
moment.min.js:1 Uncaught TypeError: Cannot set property 'moment' of undefined
at moment.min.js:1
at moment.min.js:1
当我构建运行“ng build --output-hashing=all”的相同应用程序并将结果部署到我的网络服务器上时，错误消失。
我的 angular.json 文件:
{
"$schema": "./node_modules/@angular/cli/lib/config/schema.json",
"version": 1,
"newProjectRoot": "projects",
"projects": {
"repro-app": {
"root": "",
"sourceRoot": "src",
"projectType": "application",
"prefix": "app",
"schematics": {},
"architect": {
"build": {
"builder": "@angular-devkit/build-angular:browser",
"options": {
"outputPath": "dist/repro-app",
"index": "src/index.html",
"main": "src/main.ts",
"polyfills": "src/polyfills.ts",
"tsConfig": "src/tsconfig.app.json",
"assets": [
"src/favicon.ico",
"src/assets"
],
"styles": [
"src/styles.css"
],
"scripts": [
"node_modules/moment/min/moment.min.js"
],
"es5BrowserSupport": true
},
"configurations": {
"production": {
"fileReplacements": [
{
"replace": "src/environments/environment.ts",
"with": "src/environments/environment.prod.ts"
}
],
"optimization": true,
"outputHashing": "all",
"sourceMap": false,
"extractCss": true,
"namedChunks": false,
"aot": true,
"extractLicenses": true,
"vendorChunk": false,
"buildOptimizer": true,
"budgets": [
{
"type": "initial",
"maximumWarning": "2mb",
"maximumError": "5mb"
}
]
}
}
},
"serve": {
"builder": "@angular-devkit/build-angular:dev-server",
"options": {
"browserTarget": "repro-app:build"
},
"configurations": {
"production": {
"browserTarget": "repro-app:build:production"
}
}
},
"extract-i18n": {
"builder": "@angular-devkit/build-angular:extract-i18n",
"options": {
"browserTarget": "repro-app:build"
}
},
"test": {
"builder": "@angular-devkit/build-angular:karma",
"options": {
"main": "src/test.ts",
"polyfills": "src/polyfills.ts",
"tsConfig": "src/tsconfig.spec.json",
"karmaConfig": "src/karma.conf.js",
"styles": [
"src/styles.css"
],
"scripts": [],
"assets": [
"src/favicon.ico",
"src/assets"
]
}
},
"lint": {
"builder": "@angular-devkit/build-angular:tslint",
"options": {
"tsConfig": [
"src/tsconfig.app.json",
"src/tsconfig.spec.json"
],
"exclude": [
"**/node_modules/**"
]
}
}
}
},
"repro-app-e2e": {
"root": "e2e/",
"projectType": "application",
"prefix": "",
"architect": {
"e2e": {
"builder": "@angular-devkit/build-angular:protractor",
"options": {
"protractorConfig": "e2e/protractor.conf.js",
"devServerTarget": "repro-app:serve"
},
"configurations": {
"production": {
"devServerTarget": "repro-app:serve:production"
}
}
},
"lint": {
"builder": "@angular-devkit/build-angular:tslint",
"options": {
"tsConfig": "e2e/tsconfig.e2e.json",
"exclude": [
"**/node_modules/**"
]
}
}
}
}
},
"defaultProject": "repro-app"
}
我的 package.json 文件:
{
"name": "repro-app",
"version": "0.0.0",
"scripts": {
"ng": "ng",
"start": "ng serve",
"build": "ng build",
"test": "ng test",
"lint": "ng lint",
"e2e": "ng e2e"
},
"private": true,
"dependencies": {
"@angular/animations": "~8.1.0",
"@angular/common": "~8.1.0",
"@angular/compiler": "~8.1.0",
"@angular/core": "~8.1.0",
"@angular/forms": "~8.1.0",
"@angular/platform-browser": "~8.1.0",
"@angular/platform-browser-dynamic": "~8.1.0",
"@angular/router": "~8.1.0",
"core-js": "^2.5.4",
"moment": "^2.24.0",
"rxjs": "~6.5.2",
"tslib": "^1.9.0",
"zone.js": "~0.9.1"
},
"devDependencies": {
"@angular-devkit/build-angular": "~0.801.0",
"@angular/cli": "~8.1.0",
"@angular/compiler-cli": "~8.2.0-next.0",
"@angular/language-service": "~8.1.0",
"@types/node": "~8.9.4",
"@types/jasmine": "~2.8.8",
"@types/jasminewd2": "~2.0.3",
"codelyzer": "^5.0.1",
"jasmine-core": "~2.99.1",
"jasmine-spec-reporter": "~4.2.1",
"karma": "~4.0.0",
"karma-chrome-launcher": "~2.2.0",
"karma-coverage-istanbul-reporter": "~2.0.1",
"karma-jasmine": "~1.1.2",
"karma-jasmine-html-reporter": "^0.2.2",
"protractor": "~5.4.0",
"ts-node": "~7.0.0",
"tslint": "~5.11.0",
"typescript": "~3.4.5"
}
}
可以从这里下载该应用程序:
最佳答案
从 angular.json 文件中的 scripts 数组中删除 "node_modules/moment/min/moment.min.js" 。
错误将会消失。
由于您已经使用 npm 安装了 moment.js，因此无论您想在何处使用它，只需将其导入到您的组件中即可，如下所示:
// app.component.ts
import { Component } from '@angular/core';
import * as moment from 'moment';
@Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
export class AppComponent {
title = 'repro-app';
currentDate = moment(new Date()).format('MM/DD/YYYY')
constructor() {
console.log(this.currentDate);
}
}
关于Angular 8 和 Angular cli， "ng serve"包含 moment.js 或 popper.js 模块的应用程序问题，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/56872862/