本文实例介绍了js实现图片轮播相册,具有过渡渐变效果,分享给大家供大家参考,具体内容如下
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 width=\"300\" height=\"100\" id=\"mainTb\"> <tr> <th rowspan=\"4\"><div id=\"cnt\"> </div></td> <td width=\"15\"><span class=\"ctrl\"> 1 </span></td> </tr> <tr> <td><span class=\"ctrl\"> 2 </span></td> </tr> <tr> <td><span class=\"ctrl\"> 3 </span></td> </tr> <tr> <td><span class=\"ctrl\"> 4 </span></td> </tr> </table> </BODY> </HTML>
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