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大一轮高考总复习文数(人教版)课时作业提升 下一篇:2019版高考数学(理)培优增分一轮全国经典版增分练 '; }