web前端|js教程
JavaScript,图片,滑动,切换,图片切换
web前端-js教程
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：
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var i=1; var img = new Array(); img[0] = "1.jpg"; img[1] = "2.jpg"; img[2] = "3.jpg"; img[3] = "4.jpg"; img[4] = "5.jpg"; 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.jpg"; }
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：
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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indexindex == undefined && (index = this.Index);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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