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JavaScript 图片效果- 前端的那些事儿- 博客园

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xx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：

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