[英]How I can declare a global variable in AngularJs 2
我正在创建一个购物车,我需要声明一个全局变量,并希望从不同的组件中更改变量。
Steps – 脚步 -
Create Global Variables :- “app.global.ts” 创建全局变量:-“ app.global.ts”
import { Injectable } from '@angular/core';
@Injectable()
export class AppGlobals {
readonly baseAppUrl: string = 'http://localhost:57431/';
readonly baseAPIUrl: string = 'https://api.github.com/';
}
Import and Use the Global Variables in the Component:- “user.component.ts” 导入和使用组件中的全局变量: - “user.component.ts”
import { Component, Injectable} from '@angular/core';
import { CommonModule } from '@angular/common';
import { HttpModule, Http } from '@angular/http';
import { UserService } from '../service/user.service';
import { AppGlobals } from '../shared/app.globals';
@Component({
selector: 'user',
templateUrl: './user.component.html',
styleUrls: ['./user.component.css'],
providers: [UserService, AppGlobals]
})
export class UserComponent {
//USERS DECLARATIONS.
users = [];
//HOME COMPONENT CONSTRUCTOR
constructor(private userService: UserService, private _global: AppGlobals) { }
//GET USERS SERVICE ON PAGE LOAD.
ngOnInit() {
this.userService.getAPIUsers(this._global.baseAPIUrl + 'users/hadley/orgs').subscribe(data => this.users = data);
this.userService.getAppUsers(this._global.baseAppUrl + 'api/User/GetUsers').subscribe(data => console.log(data));
}
}
//END BEGIN – USERCOMPONENT
“user.server.ts” :- “ user.server.ts”:-
import { Injectable, InjectionToken } from '@angular/core';
import { Http, Response } from '@angular/http';
import 'rxjs/add/operator/map';
//BEGIN-REGION - USERSERVICE
@Injectable()
export class UserService {
constructor(private _http: Http) {
}
getAPIUsers(apiUrl) {
return this._http.get(apiUrl).map((data: Response) => data.json());
}
getAppUsers(apiUrl) {
return this._http.get(apiUrl).map((data: Response) => data);
}
}
//END BEGIN – USERSERVICE`enter code here`
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