/**
 * 基于时间戳生成UUID
 * @returns string
 */
const generateUUID = () => {
  // Timestamp
  let d = new Date().getTime();
  // Time in microseconds since page-load or 0 if high-precision timer unavailable
  let d2 = (typeof performance !== 'undefined' && performance.now && performance.now() * 1000) || 0;
  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
    let r = Math.random() * 16; //random number between 0 and 16
    if (d > 0) {
      // Use timestamp until depleted
      r = (d + r) % 16 | 0;
      d = Math.floor(d / 16);
    } else {
      // Use microseconds since page-load if supported
      r = (d2 + r) % 16 | 0;
      d2 = Math.floor(d2 / 16);
    }
    return (c === 'x' ? r : (r & 0x3) | 0x8).toString(16);
  });
};

export default generateUUID;