JSFiddle - React, Tailwind, and code Playground

JavaScript

var keycodes = [];
document.onkeydown = function checkKeycode(event) {
    var keycode;
    if (!event) var event = window.event;
    if (event.keyCode) keycode = event.keyCode; // для IE
    else if (event.which) keycode = event.which; // для всех браузеров


	if(keycode === 13) {
	    // make Post/Get request
        console.log('Request to server');
    } else {
    	keycodes[keycodes.length] = keycode;
    }

    console.log("keycodes: " + keycodes); // Выводим сообщение

}