在异步验证器外围使用setTimeout函数包装并添加async/await语法来解决这个问题。以下是示例代码：

import { Component, OnInit } from '@angular/core';
import { FormControl, Validators } from '@angular/forms';

@Component({
  selector: 'app-example',
  template: `
    

      
      


      Submit
      


      
Validating...
      
Valid
      
Invalid
    
  `
})
export class ExampleComponent implements OnInit {
  form: FormGroup;

  ngOnInit() {
    this.form = new FormGroup({
      test: new FormControl(null, [Validators.required], [this.customValidatorAsync.bind(this)])
    });
  }

  async customValidatorAsync(control: FormControl) {
    await new Promise(resolve => setTimeout(resolve, 1000));
    if (control.value === 'invalid') {
      return { customError: true };
    }
    return null;
  }

  async submit() {
    if (this.form.valid) {
      console.log('Valid Submitted', this.form.value);
    } else {
      console.log('Invalid Form', this.form);
    }
  }
}