本文实例讲述了JS实现的相册图片左右滚动效果。分享给大家供大家参考，具体如下：
执行左移右移函数：
var $get = 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 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 = $get(slider); this._container = $get(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 "; //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 " : "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: false, //是否自动 Change: 0, //改变量 Duration: 50, //滑动持续时间 Time: 10, //滑动延时 Pause: 2000, //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 "]); 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); } };
在前天html加入div容器：
<> <div> <div id="idContainer" runat="server" > </div> </div> <> <> <div> <table cellpadding=0 cellspacing=0> <tr> <td> <img id="ImgPre" alt="" src="ImageV3/Default/pre-gray.png" /> <span id="Pre">Pre</span></td> <td> <div> <div> <img src="ImageV3/Default/greendot.png" id="Img1" /> <img src="ImageV3/Default/graydot.png" id="Img2" /> <img src="ImageV3/Default/graydot.png" id="Img3" /> </div> </div> </td> <td> <span id="Next">Next</span> <img id="ImgNext" alt="" src="ImageV3/Default/next-green.png" /> </td> </tr> </table> </div>
下面是改变左右按钮可用状态
var imgNum = $get("idContainer").getElementsByTagName("img").length; var pre = $get("Pre"); var next = $get("Next"); var i = 0; if (imgNum > 0) { var st = new SlideTrans("idContainer", "idSlider", 3, { Vertical: false }); if (i < 2) { $get("Next").onclick = function() { if (i < 2) { st.Next(); i++; if (i == 1) { $get("ImgPre").src = "ImageV3/Default/pre-green.png"; pre.style.color = "#2f6417"; } if (i == 2) { $get("ImgNext").src = "ImageV3/Default/next-gray.png"; next.style.color = "Gray"; } ChangePicIndex(i); } } } $get("Pre").onclick = function() { if (i > 0) { st.Previous(); $get("ImgNext").src = "ImageV3/Default/next-green.png"; next.style.color = "#2f6417"; i--; if (i == 0) { $get("ImgPre").src = "ImageV3/Default/pre-gray.png"; pre.style.color = "Gray"; } ChangePicIndex(i); } } st.Run(); } function ChangePicIndex(index) { switch (index) { case 1: $get("Img1").src = "ImageV3/Default/graydot.png"; $get("Img2").src = "ImageV3/Default/greendot.png"; $get("Img3").src = "ImageV3/Default/graydot.png"; break case 2: $get("Img1").src = "ImageV3/Default/graydot.png"; $get("Img2").src = "ImageV3/Default/graydot.png"; $get("Img3").src = "ImageV3/Default/greendot.png"; break default: $get("Img1").src = "ImageV3/Default/greendot.png"; $get("Img2").src = "ImageV3/Default/graydot.png"; $get("Img3").src = "ImageV3/Default/graydot.png"; } }
希望本文所述对大家JavaScript程序设计有所帮助。
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