JavaScript 無縫上下左右滾動加定高定寬停頓效果

代碼如下:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>JavaScript 無縫上下左右滾動加定高定寬停頓效果(兼容ie/ff)</title>
</head>
<body>
<script type="text/javascript">
var $ = function (id) {
        return "string" == typeof id ? document.getElementById(id) : id;
};

var Class = {
    create: function() {
        return function() {
            this.initialize.apply(this, arguments);
        }
    }
}

Object.extend = function(destination, source) {
        for (var property in source) {
                destination[property] = source[property];
        }
        return destination;
}

function addEventHandler(oTarget, sEventType, fnHandler) {
        if (oTarget.addEventListener) {
                oTarget.addEventListener(sEventType, fnHandler, false);
        } else if (oTarget.attachEvent) {
                oTarget.attachEvent("on" + sEventType, fnHandler);
        } else {
                oTarget["on" + sEventType] = fnHandler;
        }
};


var Scroller = Class.create();
Scroller.prototype = {
    initialize: function(idScroller, idScrollMid, options) {
        var oThis = this, oScroller = $(idScroller), oScrollMid = $(idScrollMid);
        
        this.SetOptions(options);
        this.Side = this.options.Side || ["up"];//方向
        this.scroller = oScroller;                        //對象
        this.speed = this.options.Speed;        //速度
        this.timer = null;                                        //時間
        this.pauseHeight = 0;                                //定高
        this.pauseWidth = 0;                                //定寬
        this.pause = 0;                                                //定高(寬)
        this.side = 0;                                                //參數
        
        //用於上下滾動
        this.heightScroller = parseInt(oScroller.style.height) || oScroller.offsetHeight;
        this.heightList = oScrollMid.offsetHeight;
        
        //用於左右滾動
        this.widthScroller = parseInt(oScroller.style.width) || oScroller.offsetWidth;
        this.widthList = oScrollMid.offsetWidth;
        
        //js取不到css設置的height和width
        
        oScroller.style.overflow = "hidden";
        oScrollMid.appendChild(oScrollMid.cloneNode(true));
        oScrollMid.appendChild(oScrollMid.cloneNode(true));
        
        addEventHandler(oScroller, "mouseover", function() { oThis.Stop(); });
        addEventHandler(oScroller, "mouseout", function() { oThis.Start(); });
        
        this.Start();
    },
    //設置默認屬性
    SetOptions: function(options) {
        this.options = {//默認值
            Step:                        1,//每次變化的px量
            Speed:                20,//速度(越大越慢)
            Side:                        ["up"],//滾動方向:"up"是上,"down"是下,"left"是左,"right"是右
            PauseHeight:        0,//隔多高停一次
            PauseWidth:        0,//隔多寬停一次
            //當上下和左右一起使用時必須設置PauseHeight和PauseWidth來設置轉向位置
            PauseStep:        1000//停頓時間(PauseHeight或PauseWidth大於0該參數纔有效)
        };
        Object.extend(this.options, options || {});
    },    
    //轉向
    Turn: function() {
        //通過設置方向數組的排列來轉向
        this.Side.push(this.Side.shift().toLowerCase());
    },
    //上下滾動
    ScrollUpDown: function() {
        this.pause = this.pauseHeight;
        this.scroller.scrollTop = this.GetScroll(this.scroller.scrollTop, this.heightScroller, this.heightList, this.options.PauseHeight);
        this.pauseHeight = this.pause;
        
        var oThis = this;
        this.timer = window.setTimeout(function(){ oThis.Start(); }, this.speed);
    },
    //左右滾動
    ScrollLeftRight: function() {
        this.pause = this.pauseWidth;
        //注意:scrollLeft超過1400會自動變回1400 注意長度
        this.scroller.scrollLeft = this.GetScroll(this.scroller.scrollLeft, this.widthScroller, this.widthList, this.options.PauseWidth);
        this.pauseWidth = this.pause;
        
        var oThis = this;
        this.timer = window.setTimeout(function(){ oThis.Start(); }, this.speed);
    },
    //獲取設置滾動數據
    GetScroll: function(iScroll, iScroller, iList, iPause) {
        var iStep = this.options.Step * this.side;
        
        if(this.side > 0){
                if(iScroll >= (iList * 2 - iScroller)){ iScroll -= iList; }
        } else {
                if(iScroll <= 0){ iScroll += iList; }
        }
        
        this.speed = this.options.Speed;
        if(iPause > 0){
                if(Math.abs(this.pause) >= iPause){
                        this.speed = this.options.PauseStep; this.pause = iStep = 0; this.Turn();
                } else {
                        this.pause += iStep;
                }
        }
        
        return (iScroll + iStep);
    },
    //開始
    Start: function() {        
        //方向設置
        switch (this.Side[0].toLowerCase()) {
                case "right" :
                        if(this.widthList < this.widthScroller) return;
                        this.side = -1;
                        this.ScrollLeftRight();
                        break;
                case "left" :
                        if(this.widthList < this.widthScroller) return;
                        this.side = 1;
                        this.ScrollLeftRight();
                        break;
                case "down" :
                        if(this.heightList < this.heightScroller) return;
                        this.side = -1;
                        this.ScrollUpDown();
                        break;
                case "up" :
                default :
                        if(this.heightList < this.heightScroller) return;
                        this.side = 1;
                        this.ScrollUpDown();
        }
    },
    //停止
    Stop: function() {
        clearTimeout(this.timer);
    }
};

window.onload = function(){
        new Scroller("idScroller", "idScrollMid",{ Side:["up","left"], PauseHeight:50, PauseWidth:400 });
}
</script>
<style>
.Scroller {}{line-height:50px; border:1px solid #000000; padding:0px 10px; height:50px; width:400px;}
.Scroller *{}{margin:0px; padding:0px;}
.ScrollMid {}{float:left;}
.ScrollMid ul{}{width:800px;float:left;}
.ScrollMid li{}{list-style:none; float:left; width:390px; padding-left:10px;}
</style>
<div id="idScroller" class="Scroller" style="width:400px; height:50px;">
    <div style="width:1600px">
        <div id="idScrollMid" class="ScrollMid">
            <ul>
                <li>111111111111</li>
                <li>2222222222222</li>
                <li>333333333333333</li>
                <li>4444444444444</li>
            </ul>
        </div>
    </div>
</div>
<div id="test"></div>
</body>
</html>
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