UUID Generator

http://stackoverflow.com/questions/105034/how-to-create-a-guid-uuid-in-javascript

by briguy37

HTML

<span id="uuid"></span><br/>
<br/>

<input id="generateUUID" type="button" value="getUUID"/>

JavaScript

function generateUUID() {
    var d = new Date().getTime();
    var d2 = (performance && performance.now && (performance.now()*1000)) || 0;//Time in microseconds since page-load or 0 if unsupported
    var uuid = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
        var r = Math.random() * 16;
        if(d > 0){
            var r = (d + r)%16 | 0;
            d = Math.floor(d/16);
        } else {
            var r = (d2 + r)%16 | 0;
            d2 = Math.floor(d2/16);
        }
        return (c=='x' ? r : (r&0x7|0x8)).toString(16);
    });
    return uuid;
};

document.getElementById('generateUUID').onclick = function() {
    document.getElementById('uuid').innerHTML = generateUUID();
};

document.getElementById('uuid').innerHTML = generateUUID();