//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&nb