出现错误 ReferenceError：在 Angular 4 生产版本（Angular 4）中未定义 userAgent答案

【问题标题】：Getting ERROR ReferenceError: userAgent is not defined, in angular 4 production build (Angular 4)出现错误 ReferenceError：在 Angular 4 生产版本（Angular 4）中未定义 userAgent
【发布时间】：2018-04-10 00:29:05
【问题描述】：

嗨，我正在用 Angular 4 开发一个项目，它在本地和开发环境中运行良好。但是当我在做 prod build 时生成了。但是在前端控制台中抛出了一些错误。

以下是配置详情：

 "apps": [
    {
      "root": "src",
      "outDir": "dist",
      "assets": [
        "assets",
        "favicon.ico"
      ],
      "index": "index.html",
      "main": "main.ts",
      "polyfills": "polyfills.ts",
      "test": "test.ts",
      "tsconfig": "tsconfig.app.json",
      "testTsconfig": "tsconfig.spec.json",
      "prefix": "app",
      "styles": [

        "../node_modules/bootstrap/scss/bootstrap.scss",
        "../node_modules/font-awesome/css/font-awesome.css",
        "../node_modules/izimodal/css/iziModal.min.css",

        "../node_modules/flatpickr/dist/flatpickr.css",
        "assets/bootstrap-daterangepicker-master/daterangepicker.scss",
       "assets/css/style.css",
        "assets/css/common.css",
        "app.scss",
        "assets/css/select2.min.css"
      ],
      "scripts": [
        "../node_modules/jquery/dist/jquery.min.js",
        "assets/js/codebird.js",
        "../node_modules/popper.js/dist/umd/popper.min.js",
        "assets/bootstrap-daterangepicker-master/moment.js",
        "../node_modules/bootstrap/dist/js/bootstrap.min.js",
        "assets/js/flexibility.js",
        "../node_modules/flatpickr/dist/flatpickr.js",
        "../node_modules/izimodal/js/iziModal.min.js",
        "assets/bootstrap-daterangepicker-master/daterangepicker.js",
        "assets/js/select2.full.min.js"
      ],
      "environmentSource": "environments/environment.ts",
      "environments": {
        "dev": "environments/environment.ts",
        "staging": "environments/environment.staging.ts",
        "prod": "environments/environment.prod.ts",
        "uat": "environments/environment.uat.ts",
        "local": "environments/environment.local.ts",
        "develop": "environments/environment.dev.ts"
      }
    }
  ],
  "e2e": {
    "protractor": {
      "config": "./protractor.conf.js"
    }
  },
  "lint": [
    {
      "project": "src/tsconfig.app.json"
    },
    {
      "project": "src/tsconfig.spec.json"
    },
    {
      "project": "e2e/tsconfig.e2e.json"
    }
  ],
  "test": {
    "karma": {
      "config": "./karma.conf.js"
    }
  },
  "defaults": {
    "styleExt": "scss",
    "component": {
    }
  }

我得到以下错误：

ERROR ReferenceError: userAgent 未定义。

我已经签入了使用该脚本的文件，它在 codebird.js 中使用。但无法解决问题。

【问题讨论】：

标签： javascript angular user-agent navigator codebird

【解决方案1】：

看起来izimodel 定义了一个变量userAgent 及其错误原因。

将 izimodel.min.js 的副本放在您的 js 文件夹 中，而不是在 node_modules 中使用它。

然后替换

(userAgent=navigator.userAgent,userAgent.indexOf("MSIE ")>-1||userAgent.indexOf("Trident/")>-1)

有

(navigator.userAgent.indexOf("MSIE ")>-1||navigator.userAgent.indexOf("Trident/")>-1)

这样就可以解决问题了

【讨论】：