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版高考英语新素养突破二轮复习课件+练习 下一篇:2020版高考历史新素养突破二轮复习专题版课件+练习 '; }