状态栏设置颜色失效该怎么办啊？

/** 
 * 设置状态栏颜色 
 * @param color 
 */ 
export function setStatusBarColor(color: string) { 
  let windowClass: window.Window | undefined = undefined; 
  try { 
    let promise = window.getLastWindow(getContext()); 
    promise.then((data) => { 
      windowClass = data; 
      windowClass.setWindowSystemBarProperties({ statusBarColor: color, statusBarContentColor: color, 
        navigationBarColor: color, navigationBarContentColor: color }) 
      console.info('Succeeded in obtaining the top window. Data: ' + JSON.stringify(data)); 
    }).catch((err: BusinessError) => { 
      console.error('Failed to obtain the top window. Cause: ' + JSON.stringify(err)); 
    }); 
  } catch (exception) { 
    console.error('Failed to obtain the top window. Cause: ' + JSON.stringify(exception)); 
  } 
}