在vue methods中定义了一个方法,其中这句 this.annotationsPoint = new Symbol(rect)
提示错误Symbol is not a constructor应该怎么修改？

    drawAnnotationPoint(centerPoint) {
        if (!this.annotationsPoint) {
          const topLeft = new Point(centerPoint.x - this.getRealDistance(this.pointSize / 2), centerPoint.y - this.getRealDistance(this.pointSize / 2))
          const rectSize = new Size(this.getRealDistance(this.pointSize), this.getRealDistance(this.pointSize))
          const rect = new Path.Rectangle(topLeft, rectSize)
          rect.fillColor = '#5446ff'
          this.annotationsPoint = new Symbol(rect)
        }

        return this.annotationsPoint.place(centerPoint)
      },

直接把 new关键字去掉下行会提示this.annotationsPoint.place is not a function