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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