HarmonyOS 播放视频的时候如何阻止应用休眠

设置屏幕常亮，不熄屏，获取窗口实例对象后，调用setWindowKeepScreenOn方法可设置屏幕是否常亮。代码示例：

let isKeepScreenOn = true;
try {
  windowClass.setWindowKeepScreenOn(isKeepScreenOn, (err) => {
    if (err.code) {
      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));
}
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