按Esc键关闭，切换焦点关闭JS

function document.onkeyup()        //按Esc键关闭，切换焦点关闭
  {
    if (window.event.keyCode==27){
        if(outObject)outObject.blur();
        closeLayer();
    }
    else if(document.activeElement)
        if(document.activeElement != outObject && document.activeElement != outButton)
        {
            closeLayer();
        }
  }