JSFiddle - React, Tailwind, and code Playground

by Ksenia Polyakova

HTML

<input type="number" id="ticket">
<input type="button" onclick="check()" value="Проверить">

JavaScript

function check() {
	var ticket = +document.getElementById( 'ticket' ).value,
  	n6 = ticket % 10,
    n5 = ( ticket % 100 - n6 ) / 10,
    n4 = ( ticket % 1000 - ticket % 100 ) / 100,
    n3 = ( ticket % 10000 - ticket % 1000 ) / 1000,
    n2 = ( ticket % 100000 - ticket % 10000 ) / 10000,
    n1 = ( ticket - ticket % 100000 ) / 100000,
    message = n1 + n2 + n3 === n4 + n5 + n6 ? 'Билет счастливый' : 'Билет несчастливый';
   
   console.log( message );
}