measure time since last keypress

by philfreo

HTML

<input id="txt" placeholder="type something here" style="width:100%" />
<br>Time since previous keypress:
<div id="output"></div>

JavaScript

var last;
var output = $('#output');
$('#txt').on('input', function() {
    var n = new Date()
    output.text((last - n) + ' ms');
    last = n;
});