JSFiddle - React, Tailwind, and code Playground

HTML

TEST

JavaScript

function getKeyup(key){
    if ( key == null ) {
        keycode = event.keyCode;
    // To Mozilla
    } else {
        keycode = key.keyCode;
    }
}
function TEST()
{
document.body.style.backgroundColor = "BLACK";
alert('Hello');
return false;
}
function getKey(key){
    if ( key == null ) {
        keycode = event.keyCode;
    // To Mozilla
    } else {
        keycode = key.keyCode;
    }
    if (keycode == 67){
        //alert(condcheck);

        TEST();
        return false;
    } 
}
$(document).ready( function (){
    $(document).keydown(function (eventObj){
        getKey(eventObj);
    });
    $(document).keyup(function (eventObj){
        getKeyup(eventObj);
    });    
});