新闻广告图片滚动展示

在做门户网站时，首页面上经常会有新闻图片类的展示，下面收集两个图片展示的方式：

方法1.显示多个图片，横行滚动

  JS代码如下：

  <mce:script type="text/javascript"><!--//offsetWidth 对象的可见宽度，包滚动条等边线，会随窗口的显示大小改变//scrollLeft:设置或获取位于对象左边界和窗口中目前可见内容的最左端之间的距离//setInterval() 方法可按照指定的周期（以毫秒计）来调用函数或计算表达式。 　　//setInterval() 方法会不停地调用函数，直到 clearInterval() 被调用或窗口被关闭。//由 setInterval() 返回的 ID 值可用作 clearInterval() 方法的参数。var MyMar;function setImgMarquee() {if (demo1.offsetWidth > demo.offsetWidth) {demo2.innerHTML = demo1.innerHTML;MyMar = setInterval(Marquee, speed)demo.onmouseout = function () { MyMar = setInterval(Marquee, speed) }demo.onmouseover = function () { clearInterval(MyMar) }}}var speed = 50function Marquee() {if (demo2.offsetWidth - demo.scrollLeft <= 0)demo.scrollLeft -= demo1.offsetWidthelse {demo.scrollLeft++}}// --></mce:script>

  页面代码如下：

  <table cellspacing="0" cellpadding="0" width="97%" align="center" border="0"><tr><td id="demo1" runat="server"><table cellspacing="0" cellpadding="0" border="0"><tr><td valign="top"><img alt="" src="img/1.jpg" mce_src="img/1.jpg" border="0" /></td><td valign="top"><img alt="" src="img/2.jpg" mce_src="img/2.jpg" border="0" /></td><td valign="top"><img alt="" src="img/3.jpg" mce_src="img/3.jpg" border="0" /></td><td valign="top"><img alt="" src="img/4.jpg" mce_src="img/4.jpg" border="0" /></td><td valign="top"><img alt="" src="img/5.jpg" mce_src="img/5.jpg" border="0" /></td><td valign="top"><img alt="" src="img/6.jpg" mce_src="img/6.jpg" border="0" /></td><td valign="top"><img alt="" src="img/7.jpg" mce_src="img/7.jpg" border="0" /></td></tr></table></td><td id="demo2"></td></tr></table>

 效果图如下：

 JS代码中设置的速度为50,上面的图片会按着此速度从右往左移动。

方法2.显示一张图片，图层上面有固定图片数码，类似于翻页功能。页面代码如下：

<mce:style type="text/css"><!--BODY {PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px } UL {PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px } .container {WIDTH: 610px; HEIGHT: 305px } .container A IMG {WIDTH: 610px; HEIGHT: 305px } .container IMG {BORDER-BOTTOM-STYLE: none; BORDER-RIGHT-STYLE: none; BORDER-TOP-STYLE: none; BORDER-LEFT-STYLE: none } .td_f A IMG {PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px } .num {POSITION: absolute; WIDTH: 90px; FLOAT: right; TOP: 280px; LEFT: 520px } .num LI {TEXT-ALIGN: center; LINE-HEIGHT: 15px; LIST-STYLE-TYPE: none; MARGIN: 1px; WIDTH: 15px; FONT-FAMILY: Arial; BACKGROUND: url() no-repeat -15px 0px; FLOAT: left; HEIGHT: 15px; COLOR: #408844; FONT-SIZE: 12px; CURSOR: pointer } .num LI.on {LINE-HEIGHT: 15px; WIDTH: 15px; BACKGROUND: url() no-repeat; HEIGHT: 15px; COLOR: #ffffff } .more {FLOAT: right } .more1 A {TEXT-ALIGN: left; LINE-HEIGHT: 25px; MARGIN: 0px 0px 0px 10px; COLOR: #3373a3 } --></mce:style><style type="text/css" mce_bogus="1"> BODY {PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px } UL {PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px } .container {WIDTH: 610px; HEIGHT: 305px } .container A IMG {WIDTH: 610px; HEIGHT: 305px } .container IMG {BORDER-BOTTOM-STYLE: none; BORDER-RIGHT-STYLE: none; BORDER-TOP-STYLE: none; BORDER-LEFT-STYLE: none } .td_f A IMG {PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px } .num {POSITION: absolute; WIDTH: 90px; FLOAT: right; TOP: 280px; LEFT: 520px } .num LI {TEXT-ALIGN: center; LINE-HEIGHT: 15px; LIST-STYLE-TYPE: none; MARGIN: 1px; WIDTH: 15px; FONT-FAMILY: Arial; BACKGROUND: url() no-repeat -15px 0px; FLOAT: left; HEIGHT: 15px; COLOR: #408844; FONT-SIZE: 12px; CURSOR: pointer } .num LI.on {LINE-HEIGHT: 15px; WIDTH: 15px; BACKGROUND: url() no-repeat; HEIGHT: 15px; COLOR: #ffffff } .more {FLOAT: right } .more1 A {TEXT-ALIGN: left; LINE-HEIGHT: 25px; MARGIN: 0px 0px 0px 10px; COLOR: #3373a3 }</style><mce:script type="text/javascript" language="javascript"><!--if(typeof(pgvMain) == 'function')pgvMain();// --></mce:script><mce:script type="text/javascript" language="javascript"><!-- var gtopTab="one"; function $id(id){return document.getElementById(id); } function changesTab(tab_id){if (tab_id==gtopTab){return; }else{$id(gtopTab).className="unselect"; $id(tab_id).className="select";$id("tab_"+gtopTab).style.display="none";$id("tab_"+tab_id).style.display="block";gtopTab=tab_id;} }// --></mce:script><mce:script type="text/javascript"><!-- 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(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: 50,//滑动持续时间Time: 10,//滑动延时Pause: 4000,//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 < 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);} };// --></mce:script></head> <body><table id="idSlider2" border="0" cellspacing="0" cellpadding="0"><tbody><tr><td class="td_f"><a href="#" mce_href="#"><img alt="" src="img/01.jpg" mce_src="img/01.jpg" /></a></td><td class="td_f"><a href="#" mce_href="#"><img alt="" src="img/02.jpg" mce_src="img/02.jpg" /></a></td><td class="td_f"><a href="#" mce_href="#"><img alt="" src="img/03.jpg" mce_src="img/03.jpg" /></a></td><td class="td_f"><a href="#" mce_href="#"><img alt="" src="img/04.jpg" mce_src="img/04.jpg" /></a></td><td class="td_f"><a href="#" mce_href="#"><img alt="" src="img/05.jpg" mce_src="img/05.jpg" /></a></td></tr></tbody></table><ul id="idNum" class="num"></ul><mce:script type="text/javascript"><!-- //new SlideTrans("idContainer", "idSlider", 3).Run(); /// 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", 5, { Vertical: false }); var nums = []; //插入数字 for(var i = 0, n = st._count - 1; i <= n;){(nums[i] = $("idNum").appendChild(document.createElement("li"))).innerHTML = ++i; } 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" : ""; }) } st.Run();// --></mce:script></body> </html>

 效果显示如下：

 其中图片大小格式和页码样式，可以在样式和JS代码中调，注意，此显示为固定数值的图片。其中body上下两部分JS代码因为页面加载顺序的不同不可调换。在页面中初始化几张图片，在body下面代码 new SlideTrans()中要对应图片数。 

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