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:2018大二轮高考总复习语文文档 下一篇:2019高三一轮总复习生物练习 '; }