html中图片自动切换效果,JS+CSS实现自动改变切换方向图片幻灯切换效果的方法...

本文实例讲述了JS+CSS实现自动改变切换方向图片幻灯切换效果的方法。分享给大家供大家参考。具体实现方法如下：

JS+CSS自动改变切换方向的图片幻灯切换效果

body,div,ul,li{margin:0;padding:0;}

ul{list-style-type:none;}

body{background:#000;text-align:center;font:12px/20px Arial;}

#box{position:relative;width:322px;height:172px;background:#fff;border-radius:5px;border:8px solid #fff;margin:10px auto;}

#box .list{position:relative;width:320px;height:240px;overflow:hidden;border:1px solid #ccc;}

#box .list li{position:absolute;top:0;left:0;width:320px;height:240px;opacity:0;filter:alpha(opacity=0);}

#box .list li.current{opacity:1;filter:alpha(opacity=100);}

#box .count{position:absolute;right:0;bottom:5px;}

#box .count li{color:#fff;float:left;width:20px;height:20px;cursor:pointer;margin-right:5px;overflow:hidden;background:#F90;opacity:0.7;filter:alpha(opacity=70);border-radius:20px;}

#box .count li.current{color:#fff;opacity:1;filter:alpha(opacity=100);font-weight:700;background:#f60;}

#tmp{width:100px;height:100px;background:red;position:absolute;}

window.onload = function ()

{

var oBox = document.getElementById("box");

var aUl = document.getElementsByTagName("ul");

var aImg = aUl[0].getElementsByTagName("li");

var aNum = aUl[1].getElementsByTagName("li");

var timer = play = null;

var i = index = 0;

var bOrder = true;

//切换按钮

for (i = 0; i < aNum.length; i++)

{

aNum[i].index = i;

aNum[i].onmouseover = function ()

{

show(this.index)

}

}

//鼠标划过关闭定时器

oBox.onmouseover = function ()

{

clearInterval(play)

};

//鼠标离开启动自动播放

oBox.onmouseout = function ()

{

autoPlay()

};

//自动播放函数

function autoPlay ()

{

play = setInterval(function () {

//判断播放顺序

bOrder ? index++ : index--;

//正序

index >= aImg.length && (index = aImg.length - 2, bOrder = false);

//倒序

index <= 0 && (index = 0, bOrder = true);

//调用函数

show(index)

},2000);

}

autoPlay();//应用

function show (a)

{

index = a;

var alpha = 0;

for (i = 0; i < aNum.length; i++)aNum[i].className = "";

aNum[index].className = "current";

clearInterval(timer);

for (i = 0; i < aImg.length; i++)

{

aImg[i].style.opacity = 0;

aImg[i].style.filter = "alpha(opacity=0)";

}

timer = setInterval(function () {

alpha += 2;

alpha > 100 && (alpha =100);

aImg[index].style.opacity = alpha / 100;

aImg[index].style.filter = "alpha(opacity = " + alpha + ")";

alpha == 100 && clearInterval(timer)

},20);

}

};

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希望本文所述对大家的javascript程序设计有所帮助。