JSFiddle - React, Tailwind, and code Playground

HTML

<input>

JavaScript

var keys = {};

$('input').keydown(function (e) {
    keys[e.which] = true;
});

$('input').keyup(function (e) {        
    getKeys();
    delete keys[e.which];    
});

function getKeys() {    
   if(keys[8]) {
        alert('bakspace pressed');
    }else if(keys[17] && keys[18] && keys[48]) {
        alert('@ pressed');
    }else if(keys[17] && keys[18] && keys[51]) {
        alert('# pressed');
    }    
}