思路很简单，用2个属性保存当前图片和上一张图片，用2个定时器分别控制透明度和当前过渡的图片。
<HTML> <HEAD> <TITLE></TITLE> </HEAD> <style> #cnt{width:100%;height:80%;} .ctrl{text-align:center;border:1px solid gray;font-size:12px;cursor:pointer;} </style> <script defer='defer'> <!-- var curOpac = 0; var filterTimer; var isIE = /internet explorer/i.test(window.navigator.appName); function MyScroll(cnt, control){ this.data = []; // 存放图片路径 this.interval = 3000; // 过渡一次的间隔时间(过渡时间+图片显示时间) this.timer; // 定时器：控制当前显示的图片 this.container = cnt; this.curFrame = 0; this.oldFrame = 0; this.controls = control; // 按钮集合 Global = this; // 获取对象的指针 this.run = function(){ this.timer = window.setInterval("Global.showFrame()", this.interval); } // 按钮的处理程序 this.go = function(i){ curOpac = 0; // 透明度归0 this.curFrame = i; // 当前要过渡的图片 this.stop(); // 清空计时器 this.showFrame(); // 当前图片过渡 this.run(); // 循环播放 } this.stop = function(){ window.clearInterval(this.timer); window.clearInterval(filterTimer); } this.showFrame = function(){ // 设置当前按钮样式 this.controls[this.oldFrame].style.backgroundColor = "white"; this.controls[this.curFrame].style.backgroundColor = "gray"; if(isIE) this.container.style.filter = "alpha(opacity=0)"; else this.container.style.cssText = "-moz-opacity:0"; this.container.innerHTML = this.data[this.curFrame]; filterTimer = window.setInterval("blend()", 100); this.oldFrame = this.curFrame; this.curFrame ++; if(this.curFrame == this.data.length){ this.curFrame = 0; } } } // 增加透明度 function blend(){ curOpac+=10; if(isIE) Global.container.style.filter='alpha(opacity=' + curOpac + ')'; else Global.container.style.cssText = "-moz-opacity:" + curOpac/100.0; if(curOpac == 100){ curOpac = 0; window.clearInterval(filterTimer); } } //开始 function startIt(){ var imgArr = []; // 创建4个图片对象保存图片路径 for(var i=0;i<4;i++){ imgArr[i] = new Image(); imgArr[i].src = "images/banner" + (i + 1) + ".jpg"; } var controlArr = $("mainTb").getElementsByTagName("span"); for(var i=0;i<controlArr.length;i++){ controlArr[i].tag = i; controlArr[i].onclick = function(){ myScroll.go(this.tag); } } var myScroll = new MyScroll($("cnt"), controlArr); myScroll.data.push("<img src='" + imgArr[0].src + "'>"); myScroll.data.push("<img src='" + imgArr[1].src + "'>"); myScroll.data.push("<img src='" + imgArr[2].src + "'>"); myScroll.data.push("<img src='" + imgArr[3].src + "'>"); myScroll.go(0); } window.onload = startIt; function $(id){ return document.getElementById(id);} //--> </script> <BODY> <table> <tr> <th rowspan="4"><div> </div></td> <td><span> 1 </span></td> </tr> <tr> <td><span> 2 </span></td> </tr> <tr> <td><span> 3 </span></td> </tr> <tr> <td><span> 4 </span></td> </tr> </table> </BODY> </HTML>