Jquery动态添加的li实现键盘控制li解决方法

Jquery动态添加的li实现键盘控制li
这是动态添加li

 //当键盘输入和焦点移动

        function down(str) {

            var reg = /^(\w|[\u4E00-\u9FA5])*$/;

            //判断是否为中文、字母、数字

            if (str.match(reg)) {

                $.ajax({

                    type: 'GET',

                    url: 'http://smartbox.gtimg.cn/s3/?r=' + Math.random() + '&q=' + str + '&t=all',

                    dataType: 'script',

                    success: function (data) {

                        if (str == "") {

                            $("#Div").addClass('none');

                        } else {

                            ch = new Array;

                            ch = v_hint.split("^");

                            $("li").remove();

                            //判断返回的字符串是否为空

                            if (ch != "N") {

                                $("#Div").removeClass('none block');

                                $("#Div").addClass('block');

                                $("#container").addClass('block');

                              

                                var old = new Array();


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

                                    var obja = new Array();

                                    obja[i] = createObj(ch[i]);

                                    //截取股票名称最多6个汉字

                                    var gpN = obja[i].name;

                                    var gpN2 = gpN.substring(0, 6);

                                    //截取缩写长度

                                    var toup = obja[i].sx;

                                    //将名称的缩写格式化为大写字母