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学年高三英语单元同步测验 下一篇:2020届高考数学(文)二轮复习模拟卷 '; }