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:2020版高考英语新创新一轮复习外研版课件+讲义+精练 下一篇:2020版高考语文新创新一轮复习通用版课件+讲义+精练 '; }