图片轮换
模仿qq/163的图片效果，可以指定显示的图片间距，每次显示的图片数量，当切换图片时，根据指定显示的图片张数，自动将当前图片定位到居中的位置。
在调用init()函数时会根据大图显示的图片自动滚动小图，让对应的小图自动居中。
显示图片的位置或者图片说明什么的，自己防止对象，使用图片类库时传递他们的id进入类库构造函数中即可。
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<!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=utf8" />
<title>JavaScript 图片滑动切换效果</title>
<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 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: 50,
//滑动持续时间
Time: 10,
//滑动延时
Pause: 2000,
//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>
<style type="text/css">
.container, .container img{width:280px; height:200px;} .container{border:1px
solid #333;} .container img{border:0;}
</style>
<div class="container" id="idContainer">
<table id="idSlider" border="0" cellpadding="0" cellspacing="0">
<tr>
<td>
<a href="http://www.cnblogs.com/cloudgamer/archive/2009/01/06/Tween.html">
<img src="http://images.cnblogs.com/cnblogs_com/cloudgamer/143727/r_rt_1.jpg"
/>
</a>
</td>
</tr>
<tr>
<td>
<a href="http://www.cnblogs.com/cloudgamer/archive/2008/07/21/ImgCropper.html">
<img src="http://images.cnblogs.com/cnblogs_com/cloudgamer/143727/r_rt_5.jpg"
/>
</a>
</td>
</tr>
<tr>
<td>
<a href="http://www.cnblogs.com/cloudgamer/archive/2008/11/17/Drag.html">
<img src="http://images.cnblogs.com/cnblogs_com/cloudgamer/143727/r_rt_3.jpg"
/>
</a>
</td>
</tr>
</table>
</div>
<br />
<br />
<style type="text/css">
.num{ position:absolute; right:5px; bottom:5px;} .num li{ float: left;
list-style:none; color: #fff; text-align: center; line-height: 16px; width:
16px; height: 16px; font-family: Arial; font-size: 12px; cursor: pointer;
margin: 1px; border: 1px solid #707070; background-color: #060a0b; } .num
li.on{ line-height: 18px; width: 18px; height: 18px; font-size: 14px; border:
0; background-color: #ce0609; font-weight: bold; }
</style>
<div class="container" id="idContainer2">
<table id="idSlider2" border="0" cellpadding="0" cellspacing="0">
<tr>
<td>
<a href="http://www.cnblogs.com/cloudgamer/archive/2009/03/11/color.html">
<img src="http://images.cnblogs.com/cnblogs_com/cloudgamer/143727/r_4.jpg"
/>
</a>
</td>
<td>
<a href="http://www.cnblogs.com/cloudgamer/archive/2008/12/24/Slider.html">
<img src="http://images.cnblogs.com/cnblogs_com/cloudgamer/143727/r_3.jpg"
/>
</a>
</td>
<td>
<a href="http://www.cnblogs.com/cloudgamer/archive/2008/12/03/Resize.html">
<img src="http://images.cnblogs.com/cnblogs_com/cloudgamer/143727/r_rt_2.jpg"
/>
</a>
</td>
</tr>
</table>
<ul class="num" id="idNum">
</ul>
</div>
<br />
<div>
<input id="idAuto" type="button" value="停止" />
<input id="idPre" type="button" value="<<" />
<input id="idNext" type="button" value=">>" />
<select id="idTween">
<option value="0">
默认缓动
</option>
<option value="1">
方式1
</option>
<option value="2">
方式2
</option>
</select>
</div>
<script>
new SlideTrans("idContainer", "idSlider", 3).Run();
///////////////////////////////////////////////////////////
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 st = new SlideTrans("idContainer2", "idSlider2", 3, {
Vertical: false
});
var nums = [];
//插入数字
for (var i = 0,
n = st._count - 1; i <= n;) { (nums[i] = $("idNum").appendChild(document.createElement("li"))).innerHTML = ++i;
}
forEach(nums,
function(o, i) {
o.onmouseover = function() {
o.className = "on";
st.Auto = false;
st.Run(i);
}
o.onmouseout = function() {
o.className = "";
st.Auto = true;
st.Run();
}
})
//设置按钮样式
st.onStart = function() {
forEach(nums,
function(o, i) {
o.className = st.Index == i ? "on": "";
})
}
$("idAuto").onclick = function() {
if (st.Auto) {
st.Auto = false;
st.Stop();
this.value = "自动";
} else {
st.Auto = true;
st.Run();
this.value = "停止";
}
}
$("idNext").onclick = function() {
st.Next();
}
$("idPre").onclick = function() {
st.Previous();
}
$("idTween").onchange = function() {
switch (parseInt(this.value)) {
case 2:
st.Tween = Tween.Bounce.easeOut;
break;
case 1:
st.Tween = Tween.Back.easeOut;
break;
default:
st.Tween = Tween.Quart.easeOut;
}
}
st.Run();
</script>
</body>
</html>