无法解决诺言

Question

我正在尝试发出get请求，但不知怎的，我无法从后端记录承诺。有什么想法我做错了什么？

  makeLoginCall(_username: string, _password: string) {
    let promise = new Promise((resolve, reject) => {
      this.http.get('xxx').subscribe(data => {      
      });
    });
    return promise;
  }

  login() {
    this.userService.makeLoginCall(this.formLogin.value.username, this.formLogin.value.password)
    .then(response => {
      console.log(response);
    }, 
    (response) => {
      if (response.status < 500) {
        console.warn('Login failed!');
      } else {
        console.error('Internal Server Error');
      }
    });
  }

Answer 1

收到回复后，您需要解析Promise，以便在解决后立即调用基础.then函数。

<强>代码

makeLoginCall(_username: string, _password: string) {
    let promise = new Promise((resolve, reject) => {
      this.http.get('xxx').subscribe(data => {   
          resolve(data); //resolve promise here
      });
    });
    return promise;
}