你的问题是你解绑定每个文件上的点击事件。你应该这样做：

your problem is that you unbind the click event on every file. you should do it on done:

done: function (e, data) {
            $("#uploadBtn").off('click')
            $.each(data.result, function (index, file) {
                $('<p/>').text(file.name).appendTo(document.body);
            });
        },
add: function (e, data) {
            $("#uploadBtn").on('click',function () {
                data.submit();
            });
        }