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:2020版地理同步新导练湘教必修一课件+精练 下一篇:2020版历史同步新导练人教必修一课件+精练 '; }