简明现代魔法 -> JavaScript -> 仿淘宝首页图片切换

仿淘宝首页图片切换

2010-06-13

仿淘宝首页图片切换,很好的一个图片切换效果。

效果演示

    JavaScript Code

    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);
    	}
    };
    
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