如何在Deck.gl中更改PointCloudLayer的背景色

import { Deck } from '@deck.gl/core';
import { PointCloudLayer } from '@deck.gl/layers';

const deck = new Deck({
  initialViewState: {
    longitude: -122.45,
    latitude: 37.78,
    zoom: 12,
    pitch: 45,
    bearing: 0
  }
});

const pointCloudLayer = new PointCloudLayer({
  id: 'point-cloud-layer',
  data: 'path/to/point-cloud-data',
  getPosition: d => [d.x, d.y, d.z],
  getColor: d => [d.r, d.g, d.b, d.a],
  getPointSize: 1
});

pointCloudLayer.setProps({
  parameters: {
    clearColor: [r, g, b, a] // 设置背景色的RGBA值
  }
});

deck.setProps({
  layers: [pointCloudLayer]
});

import { Deck } from '@deck.gl/core';
import { PointCloudLayer } from '@deck.gl/layers';

const deck = new Deck({
  initialViewState: {
    longitude: -122.45,
    latitude: 37.78,
    zoom: 12,
    pitch: 45,
    bearing: 0
  }
});

const pointCloudLayer = new PointCloudLayer({
  id: 'point-cloud-layer',
  data: 'path/to/point-cloud-data',
  getPosition: d => [d.x, d.y, d.z],
  getColor: d => [d.r, d.g, d.b, d.a],
  getPointSize: 1
});

pointCloudLayer.setProps({
  parameters: {
    clearColor: [r, g, b, a] // 设置背景色的RGBA值
  }
});

deck.setProps({
  layers: [pointCloudLayer]
});