1 发送post请求

请求头必须手动设置

首先引入HTTP模块
import { Component, OnInit } from '@angular/core';
import { HttpClient,HttpHeaders } from '@angular/common/http'
constructor(public http:HttpClient) { }
使用
  doLogin(){
    const httpOptions = {
      headers: new HttpHeaders({ 'Content-Type': 'application/jsom'})}
      let api:string = 'api地址'
      this.http.post(api,{'username':'张三','age':18},httpOptions).subscribe(res=>{
        console.log(res);
      })
    }