JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://documentcloud.github.com/underscore/underscore-min.js"></script>
<div>
    <input type="text">
</div>
    
Input: <div id="test"></div>
Keyup Count: <div id="count"></div>

JavaScript

var count = 0;
function lookup() {
    $('div#test').html($('input.text').val());
    count++;
    $('div#count').html(count);
}

$(document).keyup( _.debounce(lookup, 250, true) );