JavaScript UUID Generator

generateUUID.js

function generateUUID() {
  var d = new Date().getTime();
  if(Date.now) {
      d = Date.now(); //high-precision timer
  }
  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;
};

From this jsfiddle https://jsfiddle.net/xg7tek9j/460/