这需要一个自定义的验证器，可以这样写：

// pass in property to validate and list of validators to run on it
export function validateProperty(property: string, validators: ValidatorFn[]): ValidatorFn {
  return (control: AbstractControl): { [key: string]: any } | null => {
    // get the value and assign it to a new form control
    const propertyVal = control.value && control.value[property];
    const newFc = new FormControl(propertyVal);
    // run the validators on the new control and keep the ones that fail
    const failedValidators = validators.map(v => v(newFc)).filter(v => !!v);
    // if any fail, return the list of failures, else valid
    return failedValidators.length ? {invalidProperty: failedValidators} : null;
  };
}

使用方法：

'productType':['', validateProperty('propertyToValidate', [Validators.required, Validators.min(3)])],

被接受的解决方案的函数签名应该是。.

validateProperty(property: string, validators: ValidatorFn[]): ValidatorFn