如何进行页面横竖屏切换

let orientation = window.Orientation.AUTO_ROTATION; 
try{ 
  windowClass.setPreferredOrientation(orientation, (err) => { 
    if(err.code){ 
      console.error('Failed to set window orientation. Cause: ' + JSON.stringify(err)); 
      return; 
    } 
    console.info('Succeeded in setting window orientation.'); 
  }); 
}catch (exception) { 
  console.error('Failed to set window orientation. Cause: ' + JSON.stringify(exception)); 
}
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