• 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>
                <a href="javascript:;">行业资讯</a>
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                    <em class="arrow"></em>
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            <li>
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                    <p>            
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    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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