图片轮换

admin@striblog.com(Stri) — Thu, 17 Sep 2009 22:14:34 +0800

这个切换还好做。只是中间的效果。算法还没明白过来。先保存先。

<!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=utf-8" />
<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)));
	}
}

//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>
<style type="text/css">
* { padding:0; margin:0px; list-style:none; }

.container { margin:0 auto; margin-top:50px; }

.container, .container img { width:380px; height:230px; overflow:hidden; }

.container { border:1px solid #333; }

.container img { border:0; }

.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>
</head>
<body>
<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"></a></td>
      <td><a href="http://www.cnblogs.com/cloudgamer/archive/2008/12/24/Slider.html"></a></td>
      <td><a href="http://www.cnblogs.com/cloudgamer/archive/2008/12/03/Resize.html"></a></td>
      <td><a href="http://www.cnblogs.com/cloudgamer/archive/2008/12/24/Slider.html"></a></td>
      <td><a href="http://www.cnblogs.com/cloudgamer/archive/2008/12/03/Resize.html"></a></td>
    </tr>
  </table>
  <ul class="num" id="idNum">
  </ul>
</div>
<br />
<script type="text/javascript">
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", 5, { 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" : ""; })
}

st.Run();
</script>
</body>
</html>

http://www.cnblogs.com/cloudgamer/archive/2009/01/06/Tween.html

Stri's Blog

图片轮换