web前端|js教程
js,渐变,图片轮播
web前端-js教程
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
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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。
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#cnt{width:100%;height:80%;} .ctrl{text-align:center;border:1px solid gray;font-size:12px;cursor:pointer;} <!-- 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("");myScroll.data.push("");myScroll.data.push("");myScroll.data.push("");myScroll.go(0); }window.onload = startIt; function $(id){ return document.getElementById(id);} //-->
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