如何设置屏幕的亮度有知道的吗？

import window from '@ohos.window'; 
import { BusinessError } from '@ohos.base'; 
 
let brightness: number = 1; 
let windowClass: window.Window = window.findWindow("test"); 
try { 
  windowClass.setWindowBrightness(brightness, (err: BusinessError) => { 
    const errCode: number = err.code; 
    if (errCode) { 
      console.error('Failed to set the brightness. Cause: ' + JSON.stringify(err)); 
      return; 
    } 
    console.info('Succeeded in setting the brightness.'); 
  }); 
} catch (exception) { 
  console.error('Failed to set the brightness. Cause: ' + JSON.stringify(exception)); 
}