Example of jquery prohibiting the input of characters other than numbers (pure numeric verification code)_jquery

Used when using purely numerical verification codes, they are organized as follows:

Copy code The code is as follows:

$('#mobile-vcode').unbind( );
$("#mobile-vcode").bind("keyup change",function () {
$(this).val($(this).val().replace(/D/ g,''));
if($(this).val().length==4){
/*ajax checks whether the verification code is correct, and activates the button if it is correct*/
}
});