code: function() {
                  var newPoint = new BezierPoint(), tmp = null;
                  tmp = this.getVertex();
                  newPoint.setVertex(tmp.x, tmp.y);
                  tmp = this.getForward();
                  newPoint.setForward(tmp.x, tmp.y);
                  tmp = this.getBackward();
                  newPoint.setBackward(tmp.x, tmp.y);
                  newPoint.setSymReflaction(this.isSymReflaction);
                  newPoint.setSmooth(this.isSmooth());
                  return newPoint;
              }
docs: @method clone()
  @for kity.BezierPoint
  @description 返回贝塞尔点的一份拷贝
  
  @grammar clone() => {kity.BezierPoint}