Angular 获取FormControl对象中获取字段名

 var formGroup = this.validateForm.controls;
 //control :FormControl
 var controlName = Object.keys(formGroup).find(name => control === formGroup[name]) || null;

 validateForm: FormGroup;
 constructor(private fb: FormBuilder）{
}
init(){
 config = {
        id: [null],
        name: [null, Validators.compose([Validators.required, Validators.maxLength(50)])],
        amount: [null]
}
this.validateForm = this.fb.group(config)
}
checkDataValidator = (control: FormControl): { [s: string]: boolean } => {
if (!control.value) {
      if (this.validateForm) {
        var formGroup = this.validateForm.controls;
        var controlName = Object.keys(formGroup).find(name => control === formGroup[name]) || null;
        var amount = this.validateForm.controls['amount'].value;
        if (controlName === 'name' && !control.value && amount) {
          return { repeat: true, error: true };
        }
      }
    }
}