生成 Guid

   //生成Guid
    function getGuidGenerator() {
        var S4 = function () {
            return (((1 + Math.random()) * 0x10000) | 0).toString(16).substring(1);
        };
        return (S4() + S4() + "-" + S4() + "-" + S4() + "-" + S4() + "-" + S4() + S4() + S4());
    }