排序、添加、删除、上移、下移功能

  $(document).ready(function () {
            var radioGroup = $(".radioGroup input");
            var types = $(".add-test tr.types");
            //全部答案隐藏，默认显示第一个
            $(".add-test tr.types:gt(0)").attr({ style: 'display:none' });
            //切换题型
            radioGroup.click(function (event) {
                types.eq($(this).index()).removeAttr("style").siblings('.types').attr({ style: 'display:none' });
            });

            var answer = {
                init: function () {
                    answer.add();
                    answer.del();
                    answer.moveUp();
                    answer.moveDown();
                },
                //对列表项进行排序
                //list：重置的数据
                reset: function (list) {
                    if (!list || list.length == 0) return;
                     
                    $.each(list, function (k, v) {
                        var isNumber = parseInt($(v).find('._index').text()) > 0;
                        var text = isNumber ? text = (k + 1) + "." : String.fromCharCode(k + 65);
                        
                        $(v).find('._index').text(text);
                    });
                },
                //新增
                add: function () {
                    $('._addBtn').click(function () {
                        var _type = $(this).attr('data-type');
                        _type = !!_type ? _type : "radio";

                        var html = '';
                        if (_type == "text") {
                            html = '<div class="answer">' +
                                       '<span class="radio-btn _index">1.</span>' +
                                       '<textarea></textarea>' +
                                       '<div class="answer-function">' +
                                           '<span class="delthis"></span>' +
                                       '</div>' +
                                   '</div>';
                        }
                        else {
                            html = '<div class="answer">' +
                              '<div class="radio-btn"><input type="' + _type + '" name="add-option" /><span class="_index">A</span></div>' +
                              '<textarea></textarea>' +
                              '<div class="answer-function">' +
                              '<span class="delthis"></span>' +
                              '<span class="up"></span>' +
                              '<span class="down"></span>' +
                              '</div>' +
                              '</div>';
                        }

                        $(this).before(html);
                        answer.reset($(this).siblings('.answer'));
                    });
                },
                //删除
                del: function () {
                    $('body').on("click", ".delthis", function () {
                        //确认框
                        if (confirm("您是否确认要删除该选项？")) {
                            var td = $(this).closest('td');
                            $(this).closest('.answer').remove();
                            answer.reset(td.find('.answer'));
                        }
                    });
                },
                //上移
                moveUp: function () {
                    $('body').on("click", ".up", function () {
                        $(this).closest('.answer').prev('.answer').before($(this).closest('.answer'));
                        answer.reset($(this).closest('td').find('.answer'));
                    });
                },
                //下移
                moveDown: function () {
                    $('body').on("click", ".down", function () {
                        $(this).closest('.answer').next('.answer').after($(this).closest('.answer'));
                        answer.reset($(this).closest('td').find('.answer'));
                    });
                },
            };

            answer.init();
        });