function generateUUID(){    var d = new Date().getTime();    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&0x7|0x8)).toString(16);    });    return uuid;};

我选用的是上面这个

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