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:2019-2020新学练考英语同步必修五译林版精练 下一篇:2019语文同步新突破人教选修先秦诸子选读课件 '; }