js动态添加行

 <script>
            $(function() {
                //增加上传
                var addli = function() {
                    var linum = parseInt($(".pic-wrap li.upload").length);
                    $('.pic-wrap ul').append('<li class="upload"><input name="FileUpload' + (linum + 1) + '" type="file" >);

                };

                //增加“添加”按钮并清除原来的        
                var move_btn = function() {
                    $(".pic-wrap li.upload:last").append('<input class="add_up" type="button" value="添加" />')
                .find('.add_up').bind('click', function() {
                    addli();
                    move_btn();
                    move_btn2();
                })
                .parent('li.upload').siblings().find('.add_up').remove();
                };


                //移动“上传”按钮到最后            
                var move_btn2 = function() {
                    $('.upbtn').insertAfter(".pic-wrap li.upload:last")
                };
                $('.add_up').click(function() {
                    addli();
                    move_btn();
                    move_btn2();
                });
            });
</script>

                       <ul>
                                     <li class="upload">
                                     <input id="File1" name="FileUpload1" type="file" class="multi"/>产品名称:
                                     <input type="text" class="text2" id="ImgTitle1" name="ImgTitle1"/>
                                     <input class="add_up" type="button" value="添加" />
                                     <input type="hidden" id="fileSize"  name="fileSize" value="1"/>
                                     </li>                                
                               </ul>