HarmonyOS 熄屏时间由应用自己控制

文档请参考：

https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-window-V5#ZH-CN_TOPIC_0000001884757714__setwindowkeepscreenon9

代码实例：

windowStage.getMainWindow().then((windowClass) => {
  let isKeepScreenOn: boolean = true;
  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 code: ${err.code}, message: ${err.message}`);
        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 code: ${exception.code}, message: ${exception.message}`);
  }
})
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tips：在entryability里面，可以先把mainwindow的windowclass保存下来，然后再视频play的时候常亮 在停止播放或者其他页面的时候 就关闭 正常跟随系统时间熄屏