Cesium 怎么给点添加单击事件

求教，我使用Cesium.PointPrimitiveCollection 添加的点怎么给每一个点添加单击事件的？

let pointPrimitives = _this.viewer.scene.primitives.add(new Cesium.PointPrimitiveCollection())
      let data = [
        {x: 120.296589, y: 30.263504},
        {x: 120.296589, y: 30.261984},
        {x: 120.296589, y: 30.259051},
        {x: 120.296589, y: 30.257086},
        {x: 120.296589, y: 30.254216},
        {x: 120.296589, y: 30.250878},
        {x: 120.296589, y: 30.24988},
        {x: 120.296589, y: 30.248819},
        {x: 120.296589, y: 30.247883},
        {x: 120.296589, y: 30.245855},
        {x: 120.296589, y: 30.244311},
        {x: 120.296589, y: 30.241345},
        {x: 120.296589, y: 30.239943},
        {x: 120.296589, y: 30.238445},
        {x: 120.296589, y: 30.236745}
      ]
      data.map(item => {
        let position = Cesium.Cartesian3.fromDegrees(item.x, item.y, 0) // 这里的 50 是高度
        pointPrimitives.add({
          pixelSize: 4,
          color: Cesium.Color.RED,
          outlineColor: Cesium.Color.RED,
          outlineWidth: 0,
          position: position
        })
      })

先行感谢！！