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:2021新高考历史二轮总复习习题 下一篇:2021新高考地理二轮总复习习题 '; }