如何将注册回调转换为Observable,符合Angular 2约定？这就是回调结构的样子

userPool.signUp(this.artist.email, this.artist.password, attributeList, null, function(err, result) {
  if (err) {
    alert(err);
    return;
  }
  let cognitoUser = result.user;
  console.log(JSON.stringify(result));
  console.log('user name is ' + cognitoUser.getUsername());
});

解决方法:

有一个RxJS静态运算符就是为了这个目的：bindNodeCallback.它将一个Node风格的回调API转换为一个返回Observable的函数.

你会这样使用它：

import { Observable } from 'rxjs/Observable';
import 'rxjs/add/observable/bindNodeCallback';

let signInAsObservable = Observable.bindNodeCallback(
  userPool.signUp.bind(userPool)
);
let observable = signInAsObservable(
  this.artist.email,
  this.artist.password,
  attributeList,
  null
);
observable.subscribe(
  result => {
    let cognitoUser = result.user;
    console.log(JSON.stringify(result));
    console.log('user name is ' + cognitoUser.getUsername());
  },
  error => alert(error)
);

请注意,您需要调用bind以将signUp绑定到userPool.