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:2018版地理必修2中图版备考套餐 下一篇:2018版地理必修2人教版备考套餐课件 '; }