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外研版英语选修六同步课件+精练 下一篇:2020地理新指导鲁教必修三课件+优练 '; }