        }
      )
      viewer.addBaseLayer(baseLayer,{
        brightness:0.1
      })
      let layer = new DC.PrimitiveLayer('layer')
      viewer.addLayer(layer)
      let positions = generatePosition(20)
      positions.forEach((item) => {
        let label = new DC.BounceLabelPrimitive(item, '数字视界')
        label.setStyle({
          offsetAmount: Math.random(),
        })
        label.setStyle({
          fillColor: DC.Color.ORANGE,
          font: '12px',
        })
        layer.addOverlay