js上下滚屏 _JavaScript

js左右滚屏
<!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></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, idScrollLeft, idScrollRight, options) {
    var oScroll = this, oScroller = $(idScroller), oScrollMid = $(idScrollMid);

    this.widthScroller = oScroller.offsetWidth;
    this.widthList = oScrollMid.offsetWidth;

    if(this.widthList <= this.widthScroller) return;

    oScroller.style.overflow = "hidden";
    oScrollMid.appendChild(oScrollMid.cloneNode(true));

    this.oScroller = oScroller;
    this.scroll = true;

    this.SetOptions(options);

    this.side = 1;//1是左 -1是右
    switch (this.options.Side) {
        case "right" :
            this.side = -1;
            break;
        case "left" :
        default :
            this.side = 1;
    }

    addEventHandler(oScrollMid , "mouseover", function() { oScroll.scroll = false; });
    addEventHandler(oScrollMid , "mouseout", function() { oScroll.scroll = true; });

    if(idScrollLeft) { addEventHandler($(idScrollLeft), "click", function() { oScroll.side = 1; }); }
    if(idScrollRight) { addEventHandler($(idScrollRight), "click", function() { oScroll.side = -1; }); }

    this.Scroll();
},
//设置默认属性
SetOptions: function(options) {
    this.options = {//默认值
      Step:            1,//每次变化的px量
      Time:            50,//速度
      Side:            "left"//默认滚动方向
    };
    Object.extend(this.options, options || {});
},
//滚动
Scroll: function() {
    if (this.scroll) {
        var iScroll = this.oScroller.scrollLeft, iWidth = this.widthList;
        if(this.side > 0){
            if(iScroll >= (iWidth * 2 - this.widthScroller)){ iScroll -= iWidth; }
        } else {
            if(iScroll <= 0){ iScroll += iWidth; }
        }
        this.oScroller.scrollLeft = iScroll + this.options.Step * this.side;//注意scrollLeft超过1400会自动变回1400 注意长度
    }
    var oScroll = this; window.setTimeout(function(){ oScroll.Scroll(); }, this.options.Time);
}
};

window.onload = function(){
    new Scroller("idScroller","idScrollMid", "idScrollLeft", "idScrollRight");
}
</script>
<div id="idScroller" style="width:290px; overflow:hidden">
<div style="width:2000px">
    <div id="idScrollMid" style="float:left;">
      <div style="float:left"> <img src="1.jpg" width="150px" height="150px;"/> </div>
      <div style="float:left"> <img src="1.jpg" width="150px" height="150px;"/> </div>
    </div>
</div>
</div>
<input id="idScrollLeft" type="button" value="向左" />
<input id="idScrollRight" type="button" value="向右" />
</body>
</html>