JavaScript实现图片滑动切换的代码示例分享

<script>

 var i=1;

 var img = new Array();

 img[0] = "1.bmp";

 img[1] = "2.bmp";

 img[2] = "3.bmp";

 img[3] = "4.bmp";

 img[4] = "5.bmp";

 function playImg(){

 i=i+1;

 var imgs = document.getElementById("img");

 imgs.src =img[i];

 if(i>=4){

 i=1;

 }

 }

 window.onload = function(){

 document.getElementById("img").src="1.bmp";

 }

</script>

<img id="img" src="" width="500" hieght="500" onclick="playImg()" style="cursor:pointer;">

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);

 }

};