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:高三数学复习常见24问及解答2 下一篇:高三数学复习常见24问及解答4 '; }