//复制一行
            var tr = $("#copyClass tr").eq(1).clone();
            tr.find(":text").eq(0).attr("id","student_rqbbid_morev_"+y);//改变id
            tr.find(":text").eq(0).attr("id","student_rqbbid_moren_"+y);//改变id
            tr.find(":text").eq(1).attr("id","student_class_morev_"+y);//改变id
            tr.find(":text").eq(1).attr("id","student_class_moren_"+y);//改变id  
            tr.find(":text").eq(2).attr("id","student_xuefeibz_moren_"+y);//改变id
            tr.find(":text").eq(2).attr("id","student_xuefeibz_morev_"+y);//改变id 
            tr.find(":text").eq(3).attr("id","student_yh_moren_"+y);//改变id
            tr.find(":text").eq(3).attr("id","student_yh_morev_"+y);//改变id    
            tr.find(":text").eq(4).attr("id","student_yhje_moren_"+y);//改变id
            tr.find(":text").eq(4).attr("id","student_yhje_morev_"+y);//改变id   
            tr.find(":text").eq(5).attr("id","student_xfys_moren_"+y);//改变id
            tr.find(":text").eq(5).attr("id","student_xfys_morev_"+y);//改变id 
            tr.find(":text").eq(6).attr("id","student_xfss_moren_"+y);//改变id
            tr.find(":text").eq(6).attr("id","student_xfss_morev_"+y);//改变id               
            tr.appendTo("#copyClass");