升级到Angular 6后,应用程序显示空白白屏

7
我遵循了https://update.angular.io/的步骤进行升级到Angular 6后,发现应用程序的所有路由都显示空白白屏。浏览器控制台没有显示任何错误信息。每个路由重定向到默认路径http://localhost:4200。但是,http://localhost:4200/admin可以正常工作。
有人能帮忙看一下,问题可能是什么?你需要我提供哪些信息才能重新复现这个问题?
以下是依赖项列表:
"dependencies": {
    "@angular/animations": "6.0.3",
    "@angular/cdk": "^6.2.0",
    "@angular/common": "6.0.3",
    "@angular/compiler": "6.0.3",
    "@angular/core": "6.0.3",
    "@angular/forms": "6.0.3",
    "@angular/http": "6.0.3",
    "@angular/material": "^6.2.0",
    "@angular/material-moment-adapter": "^6.2.0",
    "@angular/platform-browser": "6.0.3",
    "@angular/platform-browser-dynamic": "6.0.3",
    "@angular/router": "6.0.3",
    "@ng-bootstrap/ng-bootstrap": "^2.0.0",
    "@ngx-translate/core": "^10.0.2",
    "@ngx-translate/http-loader": "^3.0.1",
    "@swimlane/ngx-charts": "^8.0.2",
    "@types/lodash": "^4.14.87",
    "bootstrap": "4.0.0",
    "chart.js": "^2.7.2",
    "classlist.js": "^1.1.20150312",
    "codelyzer": "^4.3.0",
    "core-js": "^2.5.1",
    "font-awesome": "^4.7.0",
    "lodash": "^4.17.4",
    "moment": "^2.19.3",
    "ng2-charts": "^1.6.0",
    "ng2-dragula": "^1.3.1",
    "ng2-file-upload": "^1.3.0",
    "ng4-charts": "^1.0.2",
    "rxjs": "^6.2.0",
    "web-animations-js": "^2.2.5",
    "zone.js": "^0.8.19"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "~0.6.6",
    "@angular/cli": "^6.0.7",
    "@angular/compiler-cli": "6.0.3",
    "@types/jasmine": "2.5.38",
    "@types/node": "^6.0.92",
    "jasmine-core": "~2.5.2",
    "jasmine-spec-reporter": "~3.2.0",
    "karma": "~1.4.1",
    "karma-chrome-launcher": "~2.0.0",
    "karma-cli": "~1.0.1",
    "karma-coverage-istanbul-reporter": "^0.2.0",
    "karma-jasmine": "^1.1.1",
    "karma-jasmine-html-reporter": "^0.2.2",
    "node-sass": "^4.7.2",
    "protractor": "~5.1.0",
    "ts-node": "~2.0.0",
    "tslint": "~5.10.0",
    "typescript": "^2.7.2"
  }

angular.json

{
  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
  "version": 1,
  "newProjectRoot": "projects",
  "projects": {
    "bcare": {
      "root": "",
      "sourceRoot": "src",
      "projectType": "application",
      "architect": {
        "build": {
          "builder": "@angular-devkit/build-angular:browser",
          "options": {
            "outputPath": "dist",
            "index": "src/index.html",
            "main": "src/main.ts",
            "tsConfig": "src/tsconfig.app.json",
            "polyfills": "src/polyfills.ts",
            "assets": [
              "src/assets"
            ],
            "styles": [
              "src/fonts.scss",
              "src/styles.scss"
            ],
            "scripts": []
          },
          "configurations": {
            "prod": {
              "fileReplacements": [
                {
                  "replace": "src/environments/environment.ts",
                  "with": "src/environments/environment.prod.ts"
                }
              ]
            }
          }
        },
        "serve": {
          "builder": "@angular-devkit/build-angular:dev-server",
          "options": {
            "browserTarget": "bcare:build"
          },
          "configurations": {
            "prod": {
              "browserTarget": "bcare:build:prod"
            }
          }
        },
        "extract-i18n": {
          "builder": "@angular-devkit/build-angular:extract-i18n",
          "options": {
            "browserTarget": "bcare:build"
          }
        },
        "test": {
          "builder": "@angular-devkit/build-angular:karma",
          "options": {
            "main": "src/test.ts",
            "karmaConfig": "./karma.conf.js",
            "polyfills": "src/polyfills.ts",
            "tsConfig": "src/tsconfig.spec.json",
            "scripts": [],
            "styles": [
              "src/fonts.scss",
              "src/styles.scss"
            ],
            "assets": [
              "src/assets"
            ]
          }
        },
        "lint": {
          "builder": "@angular-devkit/build-angular:tslint",
          "options": {
            "tsConfig": [
              "src/tsconfig.app.json",
              "src/tsconfig.spec.json"
            ],
            "exclude": []
          }
        }
      }
    },
    "bcare-e2e": {
      "root": "",
      "sourceRoot": "",
      "projectType": "application",
      "architect": {
        "e2e": {
          "builder": "@angular-devkit/build-angular:protractor",
          "options": {
            "protractorConfig": "./protractor.conf.js",
            "devServerTarget": "bcare:serve"
          }
        },
        "lint": {
          "builder": "@angular-devkit/build-angular:tslint",
          "options": {
            "tsConfig": [
              "e2e/tsconfig.e2e.json"
            ],
            "exclude": []
          }
        }
      }
    }
  },
  "defaultProject": "bcare",
  "schematics": {
    "@schematics/angular:component": {
      "prefix": "cc",
      "styleext": "scss"
    },
    "@schematics/angular:directive": {
      "prefix": "cc"
    }
  }
}

app-routing.module.ts

import {RouterModule, Routes} from '@angular/router';
import {NotFoundComponent} from './core/main/not-found.component';
import {HomeComponent} from './core/main/home/home.component';
import {LoginComponent} from './core/main/login/login.component';
import {NgModule} from '@angular/core';
import {HomeGuard} from './core/main/home/home.guard';
import {CanLoadAdmin} from './core/services/can-load-admin';
import {RulesPreviewComponent} from './branches/preparation-admin/main/rules/rules-preview/rules-preview.component';

export const APP_ROUTES: Routes = [
    {
        path: '',
        component: HomeComponent,
        canActivate: [HomeGuard],
        children: [
            {
                path: '',
                redirectTo: 'preparation',
                pathMatch: 'full'
            },
            {
                path: 'preparation',
                loadChildren: 'app/branches/preparation/preparation.module#PreparationModule'
            },
            {
                path: 'admin',
                loadChildren: 'app/admin/admin/admin.module#AdminModule',
                canLoad: [CanLoadAdmin]
            }
        ]
    },
    {path: 'login', component: LoginComponent},
    {path: 'email-preview/:id', component: RulesPreviewComponent},
    {path: '**', component: NotFoundComponent},
];


@NgModule({
    imports: [RouterModule.forRoot(APP_ROUTES)],
    exports: [RouterModule]
})
export class AppRoutingModule {
}

当您使用“ng serve”运行应用程序时,是否在CLI中看到任何错误?还是它可以成功构建和运行? - AD8
同时展示文件结构和您的 angular.json 文件会很有帮助。 - DonDaniel
@cport1 你能提供更多信息吗?我该如何在我的端解决?它没有给出任何错误提示。 - Bharat Jain
如果您检查页面,DOM是否为空?您的模块是否已在源中加载?请查看https://github.com/angular/angular-cli/issues/10673。 - cport1
你能展示一下你的 tsconfig.json 文件是什么样子的吗? - cport1
显示剩余7条评论
5个回答

5
我曾经在将Angular 5更新到6时遇到了同样的问题。我发现Angular根本没有加载到我的应用程序中,甚至没有收到“Angular is running in the development mode. Call enableProdMode() to enable the production mode.”的消息。经过一番探索,我注意到Angular 6中生成的文件之一不同了。在此之前,它生成了inline.jspolyfills.jsscripts.jsvendor.jsmain.js。自从Angular 6以后,它现在会生成runtime.js而不是inline.js。我一直在使用Angular与MVC,所以我直接引用了输出文件。我将引用从inline.*更改为runtime.*(对于MVC,则位于BundlesConfig.cs),然后一切都恢复正常了。
除非你更改了路径,否则生成的文件应该在/dist/中生成。你可以在angular.json中确认路径,在projects -> my-project-name -> architect -> build -> options -> outputPath下。
我在升级时遇到的另一个问题可能也与您的问题有关,那就是我的CSS文件不再生成,因为ng build的-ec参数在Angular 6中不再起作用;你现在必须使用--extract-css。
希望这能帮到你。

3
我曾经遇到过类似的问题,当使用Angular 6时,如果路由错误会将页面重定向到默认根目录而不是真正的导航。
对于你来说意味着什么:为了查看错误,请在浏览器控制台中激活“保留日志”(例如,在Chrome中点击齿轮图标并设置复选框),然后再试一次。错误应该会出现,这样您就可以继续解决它们了。

我已经尝试过了,但仍然没有显示任何错误。 - Bharat Jain

0
你需要在index.html文件中进行更改: 将“”更改为“”,然后运行“ng build --prod”。

0

你需要检查一下你的提供者,因为没有必要在app.module文件中包含你的提供者。能否提供一些细节,例如你的代码和控制台中的错误信息,这将非常有帮助。


我已经添加了一些更多的细节。构建或服务中没有错误,浏览器控制台也没有错误。 - Bharat Jain

0

你可能会遇到这个错误。如果你在浏览器的控制台视图中打开应用程序,你就可以看到它。

NullInjectorError: No provider for ApplicationRef!

如果是这样,将 BrowserModule 导入到 app.module.ts 中将解决你的问题。

import { BrowserModule } from '@angular/platform-browser';

您可以在这里查看相关答案。


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