• setTimeout应用 && 自动播放——幻灯片效果&& 自动改变方向——幻灯片效果

    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>setTimeout应用</title>
<style>
body,div,ul,li,p{margin:0;padding:0;}
body{font:12px/1.5 Arial;}
ul{list-style-type:none;}
#nav,#nav ul,#nav ul li,#nav ul li a:hover,#nav .subnav,#nav .subnav p,#nav .subnav p span,#nav .subnav .arrow{background:url(img/nav_bg.png) no-repeat;}
#nav{position:relative;910px;background-position:0 -36px;margin:10px auto;}
#nav ul{height:36px;line-height:36px;margin-left:10px;padding-right:10px;overflow:hidden;background-position:right -72px;}
#nav ul li{float:left;110px;margin-left:-2px;background-position:0 -108px;}
#nav ul li a{font-size:14px;color:#fff;102px;display:block;text-align:center;text-decoration:none;margin:0 2px 0 4px;}
#nav ul li a:hover{font-weight:700;background-position:-3px -144px;}
#nav .subnav{display:none;position:absolute;top:41px;auto!important;min-110px;height:27px;line-height:27px;white-space:nowrap;background-position:0 -180px;}
#nav .subnav p{margin-left:10px;padding-right:10px;background-position:right -234px;}
#nav .subnav p span{display:block;color:#235e99;background-repeat:repeat-x;background-position:0 -207px;}
#nav .subnav p a{font-size:12px;display:inline;color:#235e99;text-decoration:none;margin:0 5px;padding:0 2px;}
#nav .subnav p a:hover{font-weight:400;background-image:none;border-bottom:2px solid;}
#nav .subnav .arrow{position:absolute;top:-4px;display:block;11px;height:5px;background-position:0 -261px;}
</style>
<script type="text/javascript">
var get = {
    byId: function(id) {
        return document.getElementById(id)
    },
    byClass: function(sClass, oParent) {
        var aClass = [];
        var reClass = new RegExp("(^| )" + sClass + "( |$)");
        var aElem = this.byTagName("*", oParent);
        for (var i = 0; i < aElem.length; i++) reClass.test(aElem[i].className) && aClass.push(aElem[i]);
        return aClass
    },
    byTagName: function(elem, obj) {
        return (obj || document).getElementsByTagName(elem)
    }
};
window.onload = function ()
{
    var oNav = get.byId("nav");
    var aLi = get.byTagName("li", oNav);
    var aSubNav = get.byClass("subnav", oNav);
    var oSubNav = oEm = timer = null;
    var i = 0;
    
    for (i = 1; i < aLi.length; i++)
    {
        aLi[i].onmouseover = function ()
        {
            //隐藏所有子菜单
            for (i = 0; i < aSubNav.length; i++)aSubNav[i].style.display = "none";
            
            //获取该项下的子菜单
            oSubNav = get.byClass("subnav", this)[0];
            
            //获取该项下的指示箭头
            oEm = get.byTagName("em", this)[0];
            
            //显示该项下的子菜单
            oSubNav.style.display = "block";
            
            //判断显示区域
            oNav.offsetWidth - this.offsetLeft > oSubNav.offsetWidth ? 
            
            //如果在显示范围居左显示
            oSubNav.style.left = this.offsetLeft + "px" :
            
            //超出显示范围居右显示
            oSubNav.style.right = 0;
            
            //计算指标箭头显示位置
            oEm.style.left = this.offsetLeft - oSubNav.offsetLeft + 50 + "px";
            clearTimeout(timer);
            
            //阻止事件冒泡
            oSubNav.onmouseover = function (event)
            {
                (event || window.event).cancelBubble = true;
                clearTimeout(timer)
            }
        };
        
        aLi[i].onmouseout = function ()
        {
            timer = setTimeout(function () {
                oSubNav.style.display = "none"
            },300)    
        }
    }
};
</script>
</head>
<body>
<div id="nav">
    <ul>
        <li><a href="javascript:;">站长之家</a></li>
        <li>
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            </div>
        </li>
        <li>
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            <div class="subnav">
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                <p>            
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        </li>
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        <li>
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                <p>            
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</div>
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</html>
    自动播放——幻灯片效果
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>自动播放——幻灯片效果</title>
<style>
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;492px;height:172px;background:#fff;border-radius:5px;border:8px solid #fff;margin:10px auto;}
#box .list{position:relative;490px;height:170px;overflow:hidden;border:1px solid #ccc;}
#box .list li{position:absolute;top:0;left:0;490px;height:170px;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;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{100px;height:100px;background:red;position:absolute;}
</style>
<script type="text/javascript">
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;    
    
    //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 () {
            index++;
            index >= aImg.length && (index = 0);
            show(index);        
        },2000);    
    }
    autoPlay();//应用
    
    //图片切换, 淡入淡出效果
    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);
    }
};
</script>
</head>
<body>
<div id="box">
    <ul class="list">
        <li class="current"><img src="img/01.jpg" width="490" height="170" /></li>
        <li><img src="img/02.jpg" width="490" height="170" /></li>
        <li><img src="img/03.jpg" width="490" height="170" /></li>
        <li><img src="img/04.jpg" width="490" height="170" /></li>
        <li><img src="img/05.jpg" width="490" height="170" /></li>
    </ul>
    <ul class="count">
        <li class="current">1</li>
        <li>2</li>
        <li>3</li>
        <li>4</li>
        <li>5</li>
    </ul>
</div>
</body>
</html>
    自动改变方向——幻灯片效果
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>自动改变方向——幻灯片效果</title>
<style>
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;492px;height:172px;background:#fff;border-radius:5px;border:8px solid #fff;margin:10px auto;}
#box .list{position:relative;490px;height:170px;overflow:hidden;border:1px solid #ccc;}
#box .list li{position:absolute;top:0;left:0;490px;height:170px;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;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{100px;height:100px;background:red;position:absolute;}
</style>
<script type="text/javascript">
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
    
    //图片切换, 淡入淡出效果
    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);
    }
};
</script>
</head>
<body>
<div id="box">
    <ul class="list">
        <li class="current"><img src="img/01.jpg" width="490" height="170" /></li>
        <li><img src="img/02.jpg" width="490" height="170" /></li>
        <li><img src="img/03.jpg" width="490" height="170" /></li>
        <li><img src="img/04.jpg" width="490" height="170" /></li>
        <li><img src="img/05.jpg" width="490" height="170" /></li>
    </ul>
    <ul class="count">
        <li class="current">1</li>
        <li>2</li>
        <li>3</li>
        <li>4</li>
        <li>5</li>
    </ul>
</div>
</body>
</html>
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  • 原文地址：https://www.cnblogs.com/mayufo/p/4475002.html
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