仿淘宝首页图片切换

资料来源:http://www.cnblogs.com/cloudgamer/archive/2008/07/06/SlideTrans.html?page=2#pagedcomment
效果展示:
测试环境:IE8 (待续)
程序代码：
代码

<!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>
<title>仿淘宝首页图片切换</title>
<style type="text/css">
        .container ul, .container li
{
            list-style: none;
            margin: 0;
            padding: 0;
}
        .container, .container img
{
            width: 470px;
            height: 150px;
}
        .load 
{
/*此处background-position:50% 50% 似乎不作用(限blog页面)*/
            background: url(http://img02.taobaocdn.com/tps/i2/T16WJqXaXeXXXXXXXX-32-32.gif) #ebf5fa no-repeat 225px 55px;
            width: 470px;
            height: 150px;
            overflow: hidden;
}
        .container img
{
            border: 0;
            vertical-align: top;
}
        .num
{
            position: absolute;
            right: 5px;
            bottom: 5px;
            font: 12px/1.5 tahoma, arial;
            height: 18px;
}
        .num li
{
            float: left;
            color: #d94b01;
            text-align: center;
            line-height: 16px;
            width: 16px;
            height: 16px;
            font-family: Arial;
            font-size: 11px;
            cursor: pointer;
            margin-left: 3px;
            border: 1px solid #f47500;
            background-color: #fcf2cf;
}
        .num li.on
{
            line-height: 18px;
            width: 18px;
            height: 18px;
            font-size: 14px;
            margin-top: -2px;
            background-color: #ff9415;
            font-weight: bold;
            color: #FFF;
}
</style>
<script type="text/javascript">

var $$ = function (id) {
return "string" == typeof id ? document.getElementById(id) : id;
        };

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

var CurrentStyle = function (element) {
return element.currentStyle || document.defaultView.getComputedStyle(element, null);
        }

var Bind = function (object, fun) {
var args = Array.prototype.slice.call(arguments).slice(2);
return function () {
return fun.apply(object, args.concat(Array.prototype.slice.call(arguments)));
            }
        }

var forEach = function (array, callback, thisObject) {
if (array.forEach) {
                array.forEach(callback, thisObject);
            } else {
for (var i = 0, len = array.length; i < len; i++) { callback.call(thisObject, array[i], i, array); }
            }
        }

var Tween = {
            Quart: {
                easeOut: function (t, b, c, d) {
return -c * ((t = t / d - 1) * t * t * t - 1) + b;
                }
            },
            Back: {
                easeOut: function (t, b, c, d, s) {
if (s == undefined) s = 1.70158;
return c * ((t = t / d - 1) * t * ((s + 1) * t + s) + 1) + b;
                }
            },
            Bounce: {
                easeOut: function (t, b, c, d) {
if ((t /= d) < (1 / 2.75)) {
return c * (7.5625 * t * t) + b;
                    } else if (t < (2 / 2.75)) {
return c * (7.5625 * (t -= (1.5 / 2.75)) * t + .75) + b;
                    } else if (t < (2.5 / 2.75)) {
return c * (7.5625 * (t -= (2.25 / 2.75)) * t + .9375) + b;
                    } else {
return c * (7.5625 * (t -= (2.625 / 2.75)) * t + .984375) + b;
                    }
                }
            }
        }


//容器对象,滑动对象,切换数量
        var SlideTrans = function (container, slider, count, options) {
this._slider = $$(slider);
this._container = $$(container); //容器对象
            this._timer = null; //定时器
            this._count = Math.abs(count); //切换数量
            this._target = 0; //目标值
            this._t = this._b = this._c = 0; //tween参数

this.Index = 0; //当前索引

this.SetOptions(options);

this.Auto = !!this.options.Auto;
this.Duration = Math.abs(this.options.Duration);
this.Time = Math.abs(this.options.Time);
this.Pause = Math.abs(this.options.Pause);
this.Tween = this.options.Tween;
this.onStart = this.options.onStart;
this.onFinish = this.options.onFinish;

var bVertical = !!this.options.Vertical;
this._css = bVertical ? "top" : "left"; //方向

//样式设置
            var p = CurrentStyle(this._container).position;
            p == "relative" || p == "absolute" || (this._container.style.position = "relative");
this._container.style.overflow = "hidden";
this._slider.style.position = "absolute";

this.Change = this.options.Change ? this.options.Change :this._slider[bVertical ? "offsetHeight" : "offsetWidth"] / this._count;
        };
        SlideTrans.prototype = {
//设置默认属性
            SetOptions: function (options) {
this.options = {//默认值
                    Vertical: true, //是否垂直方向（方向不能改）
                    Auto: true, //是否自动
                    Change: 0, //改变量
                    Duration: 30, //滑动持续时间
                    Time: 10, //滑动延时
                    Pause: 3000, //停顿时间(Auto为true时有效)
                    onStart: function () { }, //开始转换时执行
                    onFinish: function () { }, //完成转换时执行
                    Tween: Tween.Quart.easeOut//tween算子
                };
                Extend(this.options, options || {});
            },
//开始切换
            Run: function (index) {
//修正index
                index == undefined && (index = this.Index);
                index < 0 && (index = this._count - 1) || index >= this._count && (index = 0);
//设置参数
                this._target = -Math.abs(this.Change) * (this.Index = index);
this._t = 0;
this._b = parseInt(CurrentStyle(this._slider)[this.options.Vertical ? "top" : "left"]);
this._c = this._target - this._b;

this.onStart();
this.Move();
            },
//移动
            Move: function () {
                clearTimeout(this._timer);
//未到达目标继续移动否则进行下一次滑动
                if (this._c && this._t < this.Duration) {
this.MoveTo(Math.round(this.Tween(this._t++, this._b, this._c, this.Duration)));
this._timer = setTimeout(Bind(this, this.Move), this.Time);
                } else {
this.MoveTo(this._target);
this.Auto && (this._timer = setTimeout(Bind(this, this.Next), this.Pause));
                }
            },
//移动到
            MoveTo: function (i) {
this._slider.style[this._css] = i + "px";
            },
//下一个
            Next: function () {
this.Run(++this.Index);
            },
//上一个
            Previous: function () {
this.Run(--this.Index);
            },
//停止
            Stop: function () {
                clearTimeout(this._timer); this.MoveTo(this._target);
            }
        };
</script>
</head>
<body>
<div class="container load" id="idContainer">
<ul id="idSlider">
<li><a href="#">
<img src="http://img08.taobaocdn.com/tps/i8/T1_mxCXhBGXXXXXXXX-470-150.jpg" alt="" />
</a></li>
<li><a href="#">
<img src="http://img.alimama.cn/bcrm/adboard/picture/2010-06-10/100610131313970.gif" alt="" />
</a></li>
<li><a href="#">
<img src="http://img.alimama.cn/bcrm/adboard/picture/2010-06-11/100611120247446.jpg" alt="" />
</a></li>
<li><a href="#">
<img src="http://img.alimama.cn/bcrm/adboard/picture/2010-06-11/100611112912364.jpg" alt="" />
</a></li>
<li><a href="#">
<img src="http://img01.taobaocdn.com/tps/i1/T1KpNDXmBaXXXXXXXX-470-150.gif" alt="" />
</a></li>
</ul>
<ul class="num" id="idNum">
</ul>
</div>
<script type="text/javascript">

var nums = [], timer, n = $$("idSlider").getElementsByTagName("li").length,

    st = new SlideTrans("idContainer", "idSlider", n, {
        onStart: function () {//设置按钮样式
            forEach(nums, function (o, i) {
                o.className = st.Index == i ? "on" : "";
            })
        }
    });

for (var i = 1; i <= n; AddNum(i++)) {
        };
function AddNum(i) {
var num = $$("idNum").appendChild(document.createElement("li"));
            num.innerHTML = i--;
            num.onmouseover = function () {
                timer = setTimeout(function () { num.className = "on"; st.Auto = false; st.Run(i); }, 200);
            }
            num.onmouseout = function () { clearTimeout(timer); num.className = ""; st.Auto = true; st.Run(); }
            nums[i] = num;
        }
        st.Run();
</script>
</body>
</html>
源代码下载