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JavaScript实现图片滑动切换的代码示例分享

假设我们这里有1到5五张bmp图片,那么控制图片切换显示的核心代码可以为:

<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;">


主要体现了一个图片的切换控制思路,可以用于各种场景,那么下面我们来看一个复杂一些的实现,能够控制滑动和停顿事件等具体的实现图片的滑动切换效果的例子:

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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