code: function Attitude(properties) {
          if (properties)
              for (var keys = Object.keys(properties), i = 0; i < keys.length; ++i)
                  if (properties[keys[i]] != null)
                      this[keys[i]] = properties[keys[i]];
      }
docs: Properties of an Attitude.
  @exports IAttitude
  @interface IAttitude
  @property {number} [pitch] 俯仰
  desc: 俯仰角，绕x轴，对应欧拉角γ。抬头为正
  unit: °
  range: [-180, 180]
  @property {number} [roll] 横滚
  desc: 翻滚角，绕z轴，对应欧拉角β。右滚为正
  unit: °
  range: [-180, 180]
  @property {number} [yaw] 偏航
  desc: 方向/航向角，绕y轴，对应欧拉角α。0为指向真北，顺时针旋转增加数值
  unit: °
  range: [-180, 180]
   
  Constructs a new Attitude.
  @exports Attitude
  @classdesc Represents an Attitude.
  @constructor
  @param {IAttitude=} [properties] Properties to set