在EntryAbility中添加如下代码：

windowStage.getMainWindow().then((win) => {
      try{
        let barColor: string = '#FFFF00';
        win.setSystemBarProperties({ navigationBarColor: barColor,
          navigationBarContentColor:"#000000",statusBarColor: barColor,statusBarContentColor:"#000000" }, () => {
        });
      } catch (e) {
        console.error("zzx===>e:"+e)
      }
    });