JavaScript 图片效果
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>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>JavaScript 图片滑动切换效果</title>
<script type="text/javascript">
/*简化document.getElementById(id)*/
var $$ = function (id) {
return "string" == typeof id ? document.getElementById(id) : id;
};
/*仿 Prototype 对象继承*/
var Extend = function(destination, source) {
for (var property in source) {
destination[property] = source[property];
}
return destination;
}
/*获取元素的最终样式IE和DOM*/
var CurrentStyle = function(element){
return element.currentStyle || document.defaultView.getComputedStyle(element, null);
}
var Bind = function(object, fun) {
var args = Array.prototype.slice.call(arguments).slice(2);
return function() {
return fun.apply(object, args.concat(Array.prototype.slice.call(arguments)));
}
}
var forEach = function(array, callback, thisObject){
if(array.forEach){
array.forEach(callback, thisObject);
}else{
for (var i = 0, len = array.length; i < len; i++) { callback.call(thisObject, array[i], i, array); }
}
}
var Tween = {
Quart: {
easeOut: function(t,b,c,d){
return -c * ((t=t/d-1)*t*t*t - 1) + b;
}
},
Back: {
easeOut: function(t,b,c,d,s){
if (s == undefined) s = 1.70158;
return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
}
},
Bounce: {
easeOut: function(t,b,c,d){
if ((t/=d) < (1/2.75)) {
return c*(7.5625*t*t) + b;
} else if (t < (2/2.75)) {
return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b;
} else if (t < (2.5/2.75)) {
return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b;
} else {
return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;
}
}
}
}
//容器对象,滑动对象,切换数量
var SlideTrans = function(container, slider, count, options) {
this._slider = $$(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>
<style type="text/css">
.container, .container img{width:400px; height:400px;}
.container img{border:0;vertical-align:top;}
</style>
</head>
<body>
<div class="container" id="idContainer">
<table id="idSlider" border="0" cellpadding="0" cellspacing="0">
<tr>
<td><a href="http://www.cnblogs.com/cloudgamer/archive/2008/07/06/SlideTrans.html"><img src="http://images.cnblogs.com/cnblogs_com/cloudgamer/143727/o_rt_3.jpg"/></a></td>
<td><a href="http://www.cnblogs.com/cloudgamer/archive/2009/01/06/Tween.html"><img src="http://images.cnblogs.com/cnblogs_com/cloudgamer/143727/o_rt_4.jpg"/></a></td>
<td><a href="http://www.cnblogs.com/cloudgamer/archive/2008/07/21/ImgCropper.html"><img src="http://images.cnblogs.com/cnblogs_com/cloudgamer/143727/o_rt_5.jpg"/></a></td>
</tr>
</table>
</div>
<script>
new SlideTrans("idContainer", "idSlider", 3, { Vertical: false }).Run();
</script>
<br />
</body>
</html>
PS:最终样式:
ie下: 微软为每个元素提供一个currentStyle对象，它包含了所有元素的style对象的特征和任何未被覆盖的CSS规则的style特性。currentStyle对象与style对象的使用方式完全一样，特性和方法都一样。所有currentStyle对象的特性都是只读的，如果给他们赋值将会引发错误，因为，currentStyle对象是对所有采用了的样式的合计，它并非一个活生生的对象，如果要动态改变样式，必须使用前面讨论过的style对象。
element.currentStyle.backgroundColor;
DOM：ＤＯＭ提供了一个getComputedStyle()方法，它根据给定的元素创建类似ｓｔｙｌｅ的对象，这个方法接受２个参数，需要获取样式的元素和诸如：hover或者：first-letter之类的伪元素，不需要可以设置为努null.可以从document.defaultView对象中访问这个方法.IE和Safari不支持这个对象。
document.defaultView.getComputedStyle(element,null).backgroundColor;
资料：http://www.cnblogs.com/cloudgamer/archive/2009/01/06/Tween.html
转载: http://www.cnblogs.com/cloudgamer/archive/2008/07/06/SlideTrans.html?page=3#pagedcomment
