如何保持屏幕常亮，你知道吗？

import { BusinessError } from '@kit.BasicServicesKit'; 
import { window } from '@kit.ArkUI'; 
 
let isKeepScreenOn: boolean = true; 
let windowClass: window.Window = window.findWindow("test"); 
try { 
  windowClass.setWindowKeepScreenOn(isKeepScreenOn, (err: BusinessError) => { 
    const errCode: number = err.code; 
    if (errCode) { 
      console.error('Failed to set the screen to be always on. Cause: ' + JSON.stringify(err)); 
      return; 
 
    } 
    console.info('Succeeded in setting the screen to be always on.'); 
  }); 
} catch (exception) { 
  console.error('Failed to set the screen to be always on. Cause: ' + JSON.stringify(exception)); 
}