Question

我在一个应用程序中使用身份验证服务中的localStorage。现在我正在使用webpack将旧应用程序迁移到新的项目结构。当然，我有不同的package.json文件，但我不知道我需要哪个特定的节点模块。

这是错误：

Exception: Call to Node module failed with error: Error: Uncaught (in promise): ReferenceError: localStorage is not defined

用于登录的组件完全复制到新项目，并且没有任何编译错误，我将组件和身份验证服务添加到app.module但是我收到了该错误。

如何设置package.json和app.module.ts个文件来定义localStorage？

这些是文件：

app.module.ts

import { RouterModule } from '@angular/router';
import { UniversalModule } from 'angular2-universal';
import { NgModule } from '@angular/core';
import { FormsModule } from '@angular/forms';
// import { DataTableModule, SharedModule} from 'primeng/primeng';

import { AppComponent } from './components/app/app.component'
import { NavMenuComponent } from './components/navmenu/navmenu.component';
import { HomeComponent } from './components/home/home.component';
import { LoginComponent } from './components/login/login.component';
import { FetchDataComponent } from './components/fetchdata/fetchdata.component';
import { CounterComponent } from './components/counter/counter.component';

import { AuthenticationService } from './components/login/authentication.service';

@NgModule({
    bootstrap: [ AppComponent ],
    declarations: [
        AppComponent,
        NavMenuComponent,
        CounterComponent,
        FetchDataComponent,
        HomeComponent,
        LoginComponent
    ],
    providers: [
        AuthenticationService
    ],
    imports: [
        UniversalModule, // Must be first import. This automatically imports BrowserModule, HttpModule, and JsonpModule too.
        FormsModule,
        RouterModule.forRoot([
            { path: '', redirectTo: 'home', pathMatch: 'full' },
            { path: 'home', component: HomeComponent },
            { path: 'login', component: LoginComponent },
            { path: 'counter', component: CounterComponent },
            { path: 'fetch-data', component: FetchDataComponent },
            { path: '**', redirectTo: 'home' },
        ])
    ]
})
export class AppModule {
}

package.json

{
  "name": "Angular2Spa",
  "version": "0.0.0",
  "dependencies": {
    "@angular/common": "2.0.0",
    "@angular/compiler": "2.0.0",
    "@angular/core": "2.0.0",
    "@angular/forms": "2.0.0",
    "@angular/http": "2.0.0",
    "@angular/platform-browser": "2.0.0",
    "@angular/platform-browser-dynamic": "2.0.0",
    "@angular/platform-server": "2.0.0",
    "@angular/router": "3.0.0",
    "@types/node": "^6.0.38",
    "angular2-platform-node": "~2.0.10",
    "angular2-universal": "~2.0.10",
    "angular2-universal-polyfills": "~2.0.10",
    "aspnet-prerendering": "^1.0.6",
    "aspnet-webpack": "^1.0.11",
    "bootstrap": "^3.3.7",
    "css": "^2.2.1",
    "css-loader": "^0.25.0",
    "es6-shim": "^0.35.1",
    "expose-loader": "^0.7.1",
    "extract-text-webpack-plugin": "^1.0.1",
    "file-loader": "^0.9.0",
    "isomorphic-fetch": "^2.2.1",
    "jquery": "^2.2.1",
    "preboot": "^4.5.2",
    "raw-loader": "^0.5.1",
    "rxjs": "5.0.0-beta.12",
    "style-loader": "^0.13.0",
    "to-string-loader": "^1.1.5",
    "ts-loader": "^0.8.2",
    "typescript": "^2.0.0",
    "url-loader": "^0.5.7",
    "webpack": "^1.12.14",
    "webpack-externals-plugin": "^1.0.0",
    "webpack-hot-middleware": "^2.10.0",
    "webpack-merge": "^0.14.1",
    "zone.js": "^0.6.21"
  }
}

这是产生错误的代码：

import { Injectable } from '@angular/core';
import { Http, Headers, Response, RequestOptions } from '@angular/http';
import { Observable } from 'rxjs';
import 'rxjs/add/operator/map'

@Injectable()
export class AuthenticationService {
    public token: string;
    public codusuario: string;
    constructor(private http: Http) {
        // set token if saved in local storage
        var currentUser = JSON.parse(localStorage.getItem('currentUser'));
        this.token = currentUser && currentUser.token;
    }

login(username, password): Observable<boolean> {
    //...
}

logout(): void {
    // clear token remove user from local storage to log user out
    this.token = null;
    localStorage.removeItem('currentUser');
}

}

Answer 1

localStorage应该在全局JS级别定义，但是你没有针对它的Typescript定义，所以编译器说没有定义。

试着放在文件的开头

声明var localStorage：any;

然后在TypeScript代码中使用localStorage。

您也可以尝试使用angular2-localstorage模块。

为angular2 app

1 个答案: