今天需要一个左右滚动图的js,从网上着了半天,修改调试了半天才弄好,于是就收藏了。不过以后真得看看js了
关键代码有注释:(红色部分是我加的注释)
<table border=”0″ cellspacing=”0″ cellpadding=”0″> <tr> <td width=”25px”> <!–向左按钮,其中src是向左的按钮图片,其中id的值不要改变–> <input id=”idPre” type=”image” src=”l.gif” onFocus=”this.blur()” /></td> <td width=”750px”> <div style=”width:800px; height:170px;”id=”idContainer2″> <!–这里的id那个值不可以改变,如果改变需要改动js,而且高度和宽度不能省去,这里还有问题,为何单元格是750这的div设置成800?为了便于滚动我调试的–> <table id=”idSlider2″ border=”0″ cellpadding=”10px” cellspacing=”0″> <!–id那个不可以改变,如果改变需要改动js,cellpadding是单元格之间的间距,cellspacing是内容与单元格线的间距–> <tr> <td><a href=”#”><img src=”1.jpg” width=”180px” height=”160px”/></a></td> <td><a href=”#”><img src=”1.jpg” width=”180px” height=”160px”/></a></td> <td><a href=”#”><img src=”1.jpg” width=”180px” height=”160px”/></a></td> <td><a href=”#”><img src=”1.jpg” width=”180px” height=”160px”/></a></td> <td><a href=”#”><img src=”1.jpg” width=”180px” height=”160px”/></a></td> <td><a href=”#”><img src=”1.jpg” width=”180px” height=”160px”/></a></td> </tr> </table> </div> </td> <td width=”25px”> <!–向右按钮,其中src是向右的按钮图片,其中id的值不要改变–> <input id=”idNext” type=”image” src=”r.gif” onFocus=”this.blur()” /> </td> </tr> </table>
js代码如下:
<script> 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 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(7);//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 ? “left” : “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,//滚动方向,这里是垂直,已固定,且不能修改) Auto: true,//是否自动 Change: 200,//改变量如果滚动有的图片不能显示,要根据图片的大小和td单元格间距来调整这个数字 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 ? “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); } }; 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 st = new SlideTrans(“idContainer2”, “idSlider2”, 3, { Vertical: false }); var nums = []; forEach(nums, function(o, i){ o.onmouseover = function(){ o.className = “on”; st.Auto = false; st.Run(i); } o.onmouseout = function(){ o.className = “”; st.Auto = true; st.Run(); } }) //设置按钮样式 st.onStart = function(){ forEach(nums, function(o, i){ o.className = st.Index == i ? “on” : “”; }) } $(“idNext”).onclick = function(){ st.Next(); } $(“idPre”).onclick = function(){ st.Previous(); } st.Run(); </script>
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