JavaScript uses regular authentication ID numbers (simple) _ Regular expressions

The ID card is 15 digits or 18 digits, 15 digits are all digits, 18 digits are the first 17 digits, and the last one is the number or the capital letter "X".

Regular expression to match:

(^\d{15}$) | (^\d{17} ([0-9]| X) $)

Examples of JavaScript are described below:

Functionisidcardno (num) {num = Num.touppercase (); 
The ID number is 15 digits or 18 digits, 15 digits are all digits, 18 digits are the first 17 digits, and the last is a check digit, possibly a number or a character X. 
if (!) ( /(^\d{15}$) | (^\d{17} ([0-9]| X) $)/.test (num)) 
{
alert (' Enter the ID card length is not correct, or the number does not meet the requirements! \n15 digit number should be full, 18 digits can be the lowest number or X. ');
Returnfalse
};}
'). AddClass (' pre-numbering '). Hide (); $ (this). addclass (' has-numbering '). Parent (). append ($numbering);
for (i = 1; I <= lines i++) {$numbering. Append ($ ('
). Text (i)); $numbering. FadeIn (1700);}); });

The above is a small set of JavaScript to introduce the use of regular verification of the identity card number (simple), I hope to help you, if you have any questions please give me a message, small series will promptly reply to everyone. Here also thank you very much for the cloud Habitat Community website support!