JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://code.jquery.com/jquery-1.11.3.min.js"></script>

JavaScript

$(document).keyup(function(evt) {
    keyPressed = evt.keyCode ? evt.keyCode : evt.which;

    switch (keyPressed) {
        case 187:
        	if (evt.shiftKey) {
            alert("+")
   			 	} else {
            alert("=")
          }
        	break;
    }
});