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generate a UUID / GUID in javascript
function generateUUID() {
var d = new Date().getTime();
if (window.performance && typeof window.performance.now === "function") {
d += performance.now();; //use high-precision timer if available
}
var uuid = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
var r = (d + Math.random() * 16) % 16 | 0;
d = Math.floor(d / 16);
return (c == 'x' ? r : (r & 0x3 | 0x8)).toString(16);
});
return uuid;
};
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