javascript实现ecshop搜索框键盘上下键切换控制

在createSelect()函数中，返回一个对象，这个对象的两个方法next（）
和prev（）中的调用的moveSelect()能正确的指向到该函数，也可以把
moveSelect()函数放到外面来。

/* 键盘操作与问题推荐选择 */

    var curDo = null;

    var select = createSelect();

    $('#keywords').keyup(function(e){

        var theEvent =  e || window.event;

        code = theEvent.keyCode ? theEvent.keyCode : (theEvent.which ? theEvent.which : theEvent.charCode)

        var KEY = {

            UP: 38,

            DOWN: 40,

            DEL: 46,

            TAB: 9,

            RETURN: 13,

            ESC: 27,

            BACKSPACE: 8,

            LEFT:37,

            RIGHT:39

        };

        clearTimeout(curDo);//键盘弹起的时候应该取消定时ajax获取数据操作

        switch(code) {

            case KEY.UP:

                select.next();

                break;

            case KEY.DOWN:

                select.prev();

                break;

            case KEY.RETURN:

                $('.suggest-hover').trigger('click');

                break;

            case KEY.LEFT:

                break;

            case KEY.RIGHT:

                break;

            default:

                curDo = setTimeout(getSuggest(),300);

                break;

        }

    });

/* suggest选择操作 */

    function createSelect(){

        var CLASSES = {

            ACTIVE: "suggest-hover"

        };

        function moveSelect(step) {

            var listItems=$('.suggest-results li');

            //当前hover的步数

            var active;

            active =  $('.'+CLASSES.ACTIVE).index();

            listItems.eq(active).removeClass(CLASSES.ACTIVE);

            active += step;

            if (active < 0) {

                active = listItems.size() - 1;

            } else if (active >= listItems.size()) {

                active = 0;

            }

            var activeItem = listItems.eq(active).addClass(CLASSES.ACTIVE);

        };

        return {

            next:function(){

                moveSelect(-1);

            },

            prev:function(){

                moveSelect(1);

            }

        };

    };

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