docs: function (e) {
      var self = this
  
      if (self._cfg.delay) {
        // iPad打开键盘时旋转比较慢
        clearTimeout(this._changeTimer)
        self._changeTimer = setTimeout(function () {
          self._fireChange(e)
        }, self._cfg.delay)
      } else {
        self._fireChange(e)
      }
    }