生成独一无二的uuid的方法

export const getUUID = () => {
  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;
};