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並前往https://qastack.cn/programming/38797414/in-angular-how-to-add-validator-to-formcontrol-after-control-is-created

如何在创建控件后将Validator添加到FormControl？ - QA Stack

myForm.controls['controlName'].setValidators([Validators.required]). 从FormGroup中的控件中删除验证器： this.myForm.controls['controlName'].clearValidators().

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