function upload_single_file(value){

    if(value==''){

        layer.msg('请添加文件',{time:1500})

    }else{

        var formData = new FormData();

        var data = document.getElementById("file").files;

        for (var i = 0; i < data.length; i++) {

            formData.append('files[]',data[i]);

        };

        $.ajax({

            type : "POST",

            url : "sub_act.php?act=upload_file",

            cache: false,

            data: formData,

            processData: false,

            contentType: false,

            dataType:'json',

            success:function(data){

                if(data.state=='success'){

                    var oli='';

                    if(data.res){

                        for(var i=0;i<data.res.length;i++){

                            oli+="<li><p><a class='hr' id='attachmentDel"+i+"' href='"+data.res[i].attachment+"'>"+data.res[i].rel_attachment+"</a></p><a href='javascript:;' onclick='delelteUpFile(\""+data.res[i].attachment+"\",\"attachmentDel"+i+"\")'>删除</a></li>"

                        }

                        if(document.getElementById('upfile_list').getElementsByTagName('p')[0].innerHTML=='无数据...'){

                            document.getElementById('upfile_list').innerHTML='';

                        }

                        $('#upfile_list').append(oli);

                    }

                }

            }

        })

    }

}