[Js practice] Determine whether the mobile phone number entered by the user is an 11-digit number. If it is not a pure number of 11 digits, it will prompt the user to input an error. If yes, it will prompt the input to be correct. - Code World

[Js practice] Determine whether the mobile phone number entered by the user is an 11-digit number. If it is not a pure number of 11 digits, it will prompt the user to input an error. If yes, it will prompt the input to be correct.

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[Js practice] Determine whether the mobile phone number entered by the user is an 11-digit number. If it is not a pure number of 11 digits, it will prompt the user to input an error. If yes, it will prompt the input to be correct.

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