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Để đảm bảo luôn đúng thì phải bỏ nó đi mới đúng. Bởi vì chính xác nhất vẫn phải là -1 chứ ko phải "-1", có thể có ngôn ngữ ko chấp nhận thế đâu.Ừa, với số thì có ngoặc hay không cũng thế thôi mà anh có thói quen viết thế cho đảm bảo luôn đúng
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alert('You must enter a valid character in the field!')
}
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