function chkdiv(divid){ var chkid=document.getElementById(divid); if(chkid != null){return true; } else {return false; } } if (chkdiv('fy')){ document.getElementById('fy').innerHTML='上一篇:语文梦游天姥吟留别课件语文版必修2 下一篇:语文蜀道难课件语文版必修2 '; }