createUUID() {
  /* 算法:生成唯一标识符 */
  var d = new Date().getTime()
  if (window.performance && typeof window.performance.now === 'function') {
    d += performance.now() //use high-precision timer if available
  }
  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
},

createUUID() {
  /* 算法:生成唯一标识符 */
  var d = new Date().getTime()
  if (window.performance && typeof window.performance.now === 'function') {
    d += performance.now() //use high-precision timer if available
  }
  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
},