本文實例講述了JS實現的幻燈片切換顯示效果。分享給大家供大家參考，具體如下：
html：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>純JS幻燈版</title><style type="text/css">*{ margin:0; padding:0;}#banner {width:1000px;text-align:left; background:#fff; margin:0 auto;}#banner img{ display:block; float:left;}.mainbox{ overflow:hidden; position:relative;}.flashbox{ overflow:hidden; position:relative;}.imagebox{ text-align:right;position:relative;z-index:999;}.bitdiv{display:inline-block;width:18px;height:18px;margin:0 10px 10px 0px;cursor:pointer;float:right;}.defimg{ background:url(styles/images/ppt_icon2.png);}.curimg{background:url(styles/images/ppt_icon1.png);}</style><script type="text/javascript" src="styles/js/ppt_ban.js"></script></head><body><div id="banner"> <script> var box =new PPTBox(); box.width = 1000; //寬度box.height = 226;//高度box.autoplayer = 3;//自動播放間隔時間//box.add({"url":"圖片地址","title":"懸浮標題","href":"鏈接地址"}) box.add({"url":"styles/images/fck_04.jpg","href":"###","title":"懸浮提示標題1"}); box.add({"url":"styles/images/fck_04.jpg","href":"###","title":"懸浮提示標題1"}); box.add({"url":"styles/images/fck_04.jpg","href":"###","title":"懸浮提示標題1"}); box.add({"url":"styles/images/fck_04.jpg","href":"###","title":"懸浮提示標題1"}); box.show(); </script></div></body></html>js：
function PPTBox(){ this.uid = PPTBoxHelper.getId(); PPTBoxHelper.instance[this.uid] = this; this._$ = function(id){return document.getElementById(id);}; this.width = 400;//寬度this.height = 300;//高度this.picWidth = 15;//小圖寬度this.picHeight = 12;//小圖高度this.autoplayer = 4;//自動播放間隔（秒） this.target = "_blank"; this._box = []; this._curIndex = 0;}PPTBox.prototype ={ _createMainBox : function (){ var flashBoxWidth = this.width * this._box.length; var html="<div id='"+this.uid+"_mainbox' class='mainbox' style='width:"+(this.width)+"px;height:"+(this.height)+"px;'>"; html += "<div id='"+this.uid+"_flashbox' class='flashbox' style='width:"+flashBoxWidth+"px;height:"+(this.height)+"px;'></div>"; html += "<div id='"+this.uid+"_imagebox' class='imagebox' style='width:"+this.width+"px;height:"+(this.picHeight)+"px;top:-"+(this.picHeight+20)+"px;'></div>"; html += "</div>"; document.write(html); }, _init : function (){ var picstyle= ""; var eventstr = "PPTBoxHelper.instance['"+this.uid+"']"; var imageHTML=""; var flashbox = ""; for(var i=0;i<this._box.length;i++){ var parame = this._box[i]; flashbox += this.flashHTML(parame.url,this.width,this.height,i); imageHTML ="<div class='bitdiv "+((i==0)?"curimg":"defimg")+"' title ="+parame.title+" src='bit01.gif' "+picstyle+" onclick = /""+eventstr+".clickPic("+i+")/" onmouseover=/""+eventstr+".mouseoverPic("+i+")/"></div>" + imageHTML; } this._$(this.uid+"_flashbox").innerHTML = flashbox; this._$(this.uid+"_imagebox").innerHTML = imageHTML; }, _play : function(){ clearInterval(this._autoplay); var idx = this._curIndex+1; if(idx>=this._box.length){idx=0;} this.changeIndex(idx); var eventstr = "PPTBoxHelper.instance['"+this.uid+"']._play()"; this._autoplay = setInterval(eventstr,this.autoplayer*1000); }, flashHTML : function(url,width,height,idx) { var isFlash = url.substring(url.lastIndexOf('.')+1).toLowerCase()=="swf"; var html = ""; if(isFlash){ html = "<object classid='clsid:D27CDB6E-AE6D-11cf-96B8-444553540000' " + "codebase='http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=7,0,19,0' width='"+width+"' height='"+height+"'>" + "<param name=/"movie/" value=/""+url+"/" />" + "<param name='quality' value='high' />" + "<param name='wmode' value='transparent'>" + "<embed src='"+url+"' quality='high' wmode='opaque' pluginspage='http://www.macromedia.com/go/getflashplayer'" +" type='application/x-shockwave-flash' height='"+height+"'></embed>" +" </object>"; } else { var eventstr = "PPTBoxHelper.instance['"+this.uid+"']"; var style = ""; if(this._box[idx].href){ style = "cursor:pointer" } html="<img src='"+url+"' style='width:"+width+"px;height:"+height+"px;"+style+"' onclick = /""+eventstr+".clickPic("+idx+")/"/>"; } return html; }, changeIndex : function(idx){ var parame = this._box[idx]; moveElement(this.uid+"_flashbox",-(idx*this.width),1); var imgs = this._$(this.uid+"_imagebox").getElementsByTagName("div"); imgs[this._box.length-1-this._curIndex].className = "bitdiv defimg"; imgs[this._box.length-1-idx].className = "bitdiv curimg"; this._curIndex = idx; }, mouseoverPic:function(idx){ this.changeIndex(idx); if(this.autoplayer>0){ clearInterval(this._autoplay); var eventstr = "PPTBoxHelper.instance['"+this.uid+"']._play()"; this._autoplay = setInterval(eventstr,this.autoplayer*1000); } }, clickPic:function(idx){ var parame = this._box[idx]; if(parame.href&¶me.href!=""){ window.open(parame.href,this.target); } }, add:function (imgParam){ this._box[this._box.length] = imgParam; }, show : function () { this._createMainBox(); this._init(); if(this.autoplayer>0){ var eventstr = "PPTBoxHelper.instance['"+this.uid+"']._play()"; this._autoplay = setInterval(eventstr,this.autoplayer*1000); } }}var PPTBoxHelper ={ count: 0, instance: {}, getId: function() { return '_ppt_box-' + (this.count++); }};function moveElement(elementID,final_x,interval) { if (!document.getElementById) return false; if (!document.getElementById(elementID)) return false; var elem = document.getElementById(elementID); if (elem.movement) { clearTimeout(elem.movement); } if (!elem.style.left) { elem.style.left = "0px"; } var xpos = parseInt(elem.style.left); if (xpos == final_x ) { return true; } if (xpos < final_x) { var dist = Math.ceil((final_x - xpos)/5); xpos = xpos + dist; } if (xpos > final_x) { var dist = Math.ceil((xpos - final_x)/5); xpos = xpos - dist; } elem.style.left = xpos + "px"; var repeat = "moveElement('"+elementID+"',"+final_x+","+interval+")"; elem.movement = setTimeout(repeat,interval);}效果圖如下：
更多關於JavaScript相關內容感興趣的讀者可查看本站專題：《JavaScript切換特效與技巧總結》、《JavaScript查找算法技巧總結》、《JavaScript動畫特效與技巧匯總》、《JavaScript錯誤與調試技巧總結》、《JavaScript數據結構與算法技巧總結》及《JavaScript數學運算用法總結》
希望本文所述對大家JavaScript程序設計有所幫助。