说明：
angular使用http实现get和post请求

提示：在运行本项目前，请先导入路由router，可以参考我上一篇文章。
效果图：

step1:E:\projectgood\ajsix\untitled4\package.json
“@angular/cdk”: “^18.2.10”,
“@angular/material”: “^18.2.10”,
step2:E:\projectgood\ajsix\untitled4\src\app\model\Service.ts

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs';@Injectable()
export class Service {url = 'https://demo.restheart.org/messages';constructor(private http: HttpClient) {}public get(page: number = 1): Observable<Array<any>> {return this.http.get<Array<any>>(`${this.url}?pagesize=5&page=${page}`);}public size(): Observable<any> {return this.http.get(`${this.url}/_size`);}public delete(id: string): Observable<any> {return this.http.delete(`${this.url}/${id}`);}public getSingleCharacterz(id:string):Observable<any>{return this.http.get(`http://localhost:5000/api/water`)}public postSingleCharacterz(data: any): Observable<any> {const water =  {watername: '韩红牌纯净水',watericon: 'http://e.hiphotos.baidu.com/image/pic/item/a1ec08fa513d2697e542494057fbb2fb4316d81e.jpg',waterstyle: '最中幻想',watersize: '50L',waterprice: '32',shopaccount: '772024102801',shopname: '大润发超市'}return this.http.post(`http://localhost:5000/api/wateradd`, water);}public post(data: any): Observable<any> {const _data = {message: data.message,from: data.from};return this.http.post(this.url, _data);}
}

step3:E:\projectgood\ajsix\untitled4\src\app\user\user.component.html

<p>user works!</p>
<button mat-flat-button color="primary" (click)="onAcceptClick('element.operate')">查询</button>
<button mat-flat-button color="primary" (click)="onAddClick('element.operate')">新增</button>

step4:E:\projectgood\ajsix\untitled4\src\app\user\user.component.ts

import { Component, OnInit } from '@angular/core';
import { Observable, tap } from 'rxjs';
// import { Service } from './service';
import { FormsModule } from '@angular/forms';
import { AsyncPipe, JsonPipe, DatePipe } from '@angular/common';
import { HttpClient, HttpClientModule, HttpHandler } from '@angular/common/http';import {Service} from '../model/Service';
import {MatButtonModule} from '@angular/material/button';@Component({selector: 'app-user',standalone: true,imports: [FormsModule,AsyncPipe,JsonPipe,DatePipe,HttpClientModule,MatButtonModule],templateUrl: './user.component.html',providers:[Service],styleUrl: './user.component.css'
})
export class UserComponent implements OnInit  {constructor(private service: Service) {}ngOnInit(): void {}onAcceptClick(key: string): void {console.log('you click onAcceptClick'+key)this.service.getSingleCharacterz('1').subscribe((result:any)=>{console.log(result)},(error:any)=>{console.error('Error : '+error);});}onAddClick(key: string): void {console.log('you click onAddClick' + key)this.service.postSingleCharacterz('1').pipe(tap()).subscribe((resp) =>{console.log(resp)});}}

end