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並前往https://stackoverflow.com/questions/49593798/how-to-get-value-of-a-formcontrol-in-angular4

How to get value of a FormControl in Angular4 - Stack Overflow

... you the value of the formControl and then you can check on the length. ... StackBlitz URL: https://stackblitz.com/edit/angular-kqz4nw.

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