JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="do" name="do" />

JavaScript

$(function() {
 $('#do').on('input', function() {

        array = ['08','06','05','03','123456'];
        do = $(this).val();
     
		if ($.inArray(do, array) > -1) {
			$(this).css('background-color', '#FFFFFF');
			console.log (do + ' - ' + array + ' - not found');
		} else {
			$(this).css('background-color', '#FAFAFA');
			console.log (do + ' - ' + array + ' - found');
		}
      });
    });