$.fn.extend({
    /*----------------------------
      多行文字滚动代码 v1.1
      @author:wlf
      @qq: 4461329
      @addtime: 2012-12-17
      @lastedit: 2013-5-31
    -----------------------------*/
    Scroll: function(option, callback) {
        //参数初始化 
        var opt = {
            line:1,
            speed:500,
            timer:2800,
            upbtn:"",//向上按钮 
            downbtn:"",//向下按钮
            type:"",//up | left
            leftbtn:"",
            rightbtn:"",
            nownumobj:"",
            totalnumobj:"",
            autoscroll:true
        };
        $.extend(opt,option);
        var _btnUp = $(opt.upbtn);
        var _btnDown = $(opt.downbtn);
        var _btnLeft = $(opt.leftbtn);
        var _btnRight = $(opt.rightbtn);
        var _nownumObj = $(opt.nownumobj);
        var _totalnumObj = $(opt.totalnumobj);
        var timerID;
        var nowLi=1;//当前Li
        var _this = this.eq(0).find("ul:first");
        var lineH = _this.find("li:first").height(),//获取行高 
        lineW = _this.find("li:first").width(),//获取行宽
        totalLi = _this.find("li").length, //总条数
        //每次滚动的行数，默认为一屏，即父容器高度 
        line = opt.line ? parseInt(opt.line, 10) : parseInt((opt.type=="up"?this.height() / lineH:this.width() / lineW), 10),
        _speed = (opt.speed ? parseInt(opt.speed, 10) : 500);//卷动速度，数值越大，速度越慢（毫秒） 
        _timer = opt.timer; //?parseInt(opt.timer,10):3000; //滚动的时间间隔（毫秒） 
        if (line == 0) line = 1;
        var upHeight = 0 - line * lineH;
        var LeftWidth = 0 - line * lineW;
        //滚动函数 
        var scrollUp = function() {
            _btnUp.unbind("click", scrollUp);//取消向上按钮的函数绑定 
            _this.animate({
                marginTop: upHeight
            },
            _speed, 
            function() {
                for (i = 1; i <= line; i++) {
                    _this.find("li:first").appendTo(_this);
                }
                _this.css({
                    marginTop: 0
                });
                _btnUp.bind("click", scrollUp);//绑定向上按钮的点击事件 
            });
        }
        //向下翻页函数 
        var scrollDown = function() {
            _btnDown.unbind("click", scrollDown);
            for (i = 1; i <= line; i++) {
                _this.find("li:last").show().prependTo(_this);
            }
            _this.css({
                marginTop: upHeight
            });
            _this.animate({
                marginTop: 0
            },
            _speed, 
            function() {
                _btnDown.bind("click", scrollDown);
            });
        }
        //向左滚动
        var scrollLeft = function(){
            $("*").stop();
            _btnLeft.unbind("click", scrollLeft);//取消向上按钮的函数绑定
            _this.animate({
                 "marginLeft": LeftWidth
            },
            _speed, 
            function() {
                SetNum();
                for (i = 1; i <= line; i++) {
                    _this.find("li:first").appendTo(_this);
                }
                _this.css({
                     "marginLeft": 0
                });
                _btnLeft.bind("click", scrollLeft);//绑定向上按钮的点击事件 
            });
        };
        //向右滚动
        var scrollRight = function() {
            $("*").stop();
            _btnDown.unbind("click", scrollRight);
            for (i = 1; i <= line; i++) {
                _this.find("li:last").show().prependTo(_this);
            }
            _this.css({
                "marginLeft": LeftWidth
            });
            _this.animate({
                "marginLeft": 0
            },
            _speed, 
            function() {
                SetNum();
                _btnDown.bind("click", scrollRight);
            });
        }
        var SetNum = function(){
            //数值显示
            if(nowLi>totalLi)nowLi=1;
            _nownumObj.html(nowLi);
            _totalnumObj.html(totalLi);
            nowLi++;
        }
        //自动播放 
        var autoPlay = function() {
            if (_timer) {
                if(opt.type=="up"){
                    timerID = window.setInterval(scrollUp, _timer);
                }else{
                    timerID = window.setInterval(scrollLeft, _timer);
                }
            };
        };
        var autoStop = function() {
            if (_timer) window.clearInterval(timerID);
        };
        //鼠标事件绑定 
        //_this.hover(autoStop, autoPlay).mouseout();
        _btnUp.css("cursor", "pointer").click(scrollUp)//.hover(autoStop, autoPlay);//向上向下鼠标事件绑定 
        _btnDown.css("cursor", "pointer").click(scrollDown)//.hover(autoStop, autoPlay);
        _btnLeft.css("cursor", "pointer").click(scrollLeft)//.hover(autoStop, autoPlay);
        _btnRight.css("cursor", "pointer").click(scrollRight)//.hover(autoStop, autoPlay);
        SetNum();
        if (_timer && opt.autoscroll) autoPlay();
    },
    ScrollEasy:function(type,demo1,demo2,speed){
        var timerID,demo = this.eq(0),demo1 = $(demo1),demo2 = $(demo2);
        demo2.html(demo1.html());
        //左
        var MarqueeLeft = function(){ 
            if(demo.scrollLeft()>=demo1.width())
                demo.scrollLeft(0); 
            else{
                demo.scrollLeft(demo.scrollLeft()+1);
            }
        }
        //右
        var MarqueeRight = function (){ 
            if(demo.scrollLeft()==0){
                demo.scrollLeft(demo1.width());
            }else{
                demo.scrollLeft(demo.scrollLeft()-2);
            }
        }
        //自动播放 
        var autoPlay = function() {
            if (speed) {
                if (type=="left"){
                    timerID = window.setInterval(MarqueeLeft,speed);
                }else{
                    timerID = window.setInterval(MarqueeRight,speed); 
                }
            }
        };
        var autoStop = function() {
            if (speed) window.clearInterval(timerID);
        };
        //鼠标事件绑定 
        demo.hover(autoStop, autoPlay).mouseout();
    }
});