angularjs的请求数据的方式

在 app.module.ts 中引入 HttpClientModule 并注入

import {HttpClientModule} from '@angular/common/http';
imports: [
  BrowserModule,
  HttpClientModule
]

Angular get 请求数据
在用到的地方引入 HttpClient 并在构造函数声明

import {HttpClient} from "@angular/common/http";
constructor(public http:HttpClient) { }

get 请求数据

var api = "http://a.itying.com/api/productlist";
this.http.get(api).subscribe(response => {console.log(response);
});

Angular post 提交数据
在用到的地方引入 HttpClient、HttpHeaders 并在构造函数声明 HttpClient

import {HttpClient,HttpHeaders} from "@angular/common/http";
constructor(public http:HttpClient) { }

post 提交数据

const httpOptions = {headers: new HttpHeaders({ 'Content-Type': 'application/json'})
};
var api = "http://127.0.0.1:3000/doLogin";
this.http.post(api,{username:'张三',age:'20'},httpOptions).subscribe(response => {console.log(response);
});

Angular Jsonp 请求数据
在 app.module.ts 中引入 HttpClientModule、HttpClientJsonpModule 并注入

import {HttpClientModule,HttpClientJsonpModule} from
'@angular/common/http';
imports: [
  BrowserModule,
  HttpClientModule,
  HttpClientJsonpModule
]

在用到的地方引入 HttpClient 并在构造函数声明

import {HttpClient} from "@angular/common/http";
constructor(public http:HttpClient) { }

jsonp 请求数据

var api = "http://a.itying.com/api/productlist";
this.http.jsonp(api,'callback').subscribe(response => {console.log(response);
});

Angular 中使用第三方模块 axios 请求数据
安装 axios

cnpm install axios --save

用到的地方引入 axios

import axios from 'axios';
axios.get('/user?ID=12345')
.then(function (response) {
// handle success
console.log(response);
})
.catch(function (error) {
// handle error
console.log(error);
})
.then(function () {// always executed});

封装 service 作为 http 服务

import {Injectable} from '@angular/core';
import axios from 'axios';
@Injectable({providedIn: 'root'})
export class HttpserviceService {constructor() { }
  axiosGet(api){return new Promise((resolve,reject)=>{axios.get(api)
          .then(function (response) {
            // handle success     
            resolve(response)
          });
    })

  }  
}