原生JS实现图片跑马灯特效

今天给大家分享一个用原生JS实现的图片跑马灯特效，效果如下：
实现的代码如下，欢迎大家复制粘贴。
代码语言：javascript复制
<!DOCTYPE html>
<html>

<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>原生JS实现图片跑马灯特效</title>

    <style type="text/css">
        * {
            padding: 0;
            margin: 0;
        }

        li {
            list-style: none;
        }

        img {
            border: none;
        }

        body {
            background: #eee;
        }

        .slide-module {
            width: 120px;
            height: 400px;
            margin: 0 auto;
            background: #fff;
            border: 1px solid #ccc;
            position: relative;
            top: 50px;
        }

        .slide-module .up {
            width: 27px;
            height: 27px;
            /* 向上的箭头 */
            background: url(images/0.gif) no-repeat;
            position: absolute;
            top: 4px;
            left: 50%;
            margin-left: -16px;
            cursor: pointer;
            filter: alpha(opacity=60);
            opacity: 0.6;
        }

        .slide-module .down {
            width: 27px;
            height: 27px;
            /* 向下的箭头 */
            background: url(images/5.gif) no-repeat;
            position: absolute;
            bottom: 4px;
            left: 50%;
            margin-left: -16px;
            cursor: pointer;
            filter: alpha(opacity=60);
            opacity: 0.6;
        }

        .slide-module .wrap {
            width: 120px;
            height: 330px;
            position: absolute;
            top: 35px;
            left: 0;
            overflow: hidden;
        }

        .slide-module ul {
            width: 120px;
            position: absolute;
            top: 0;
            left: 0;
        }

        .slide-module li {
            width: 120px;
            height: 110px;
            float: left;
        }

        .slide-module a {
            display: block;
            width: 100px;
            height: 100px;
            border: 1px solid red;
            margin: 0 auto;
            position: relative;
            top: 4px;
        }

        .slide-module a:hover {
            border: 1px solid #333;
        }

        .slide-module .active {
            border: 10px solid #000;
        }
    </style>
    <script type="text/javascript">

        window.onload = function () {
            miaovSlide('miaovSlide');
        };

        function miaovSlide(o) {
            //获取操作对象容器
            var obj = document.getElementById(o);
            if (!obj) return;
            //获取对象下面所有的div
            var aDiv = obj.getElementsByTagName('div');
            //获取向上箭头
            var oUp = getClass('up');
            //获取向下箭头
            var oDown = getClass('down');
            //获取图片容器
            var oWrap = getClass('wrap');
            //获取图片列表
            var oUl = oWrap.getElementsByTagName('ul')[0];
            //获取图片列表项
            var oLi = oUl.getElementsByTagName('li');

            var oTime = null;
            var iMs = 30;
            var i = 0;
            var iNum = 5;
            var toggle = -1;

            oUl.innerHTML  = oUl.innerHTML;

            // 点击向上时，向上走
            oUp.onclick = function () {

                toggle = -1;

                autoPlay(toggle);
            };

            // 点击向下时，向走走
            oDown.onclick = function () {
                toggle = 1;
                autoPlay(toggle);
            };

            // 向上与向下箭头鼠标移入时，修改其透明度为1
            oUp.onmouseover = oDown.onmouseover = function () {
                this.style.filter = 'alpha(opacity:100)';
                this.style.opacity = 1;
            };

            // 向上与向下箭头鼠标移入时，修改其透明度为0.6
            oUp.onmouseout = oDown.onmouseout = function () {
                this.style.filter = 'alpha(opacity:60)';
                this.style.opacity = 0.6;
            };

            // 图片运动方法,toggle代表向下或是向上的值
            function autoPlay(toggle) {
                // 清除原有定时器
                if (oTime) {
                    clearInterval(oTime);
                }
                // 重新开启定时器
                oTime = setInterval(function () {
                    // 第次增量
                    iNum  = 2 * toggle;
                    // UL向下走,当top值大于0时
                    if (iNum > 0) {
                        // 设定top值为负的UL高度的一半(向上拉)
                        iNum = -oLi.length * oLi[0].offsetHeight / 2;
                    }
                    // UL向上走，当top值的绝对值大于UL自身宽度的一半时
                    if (Math.abs(iNum) > oLi.length * oLi[0].offsetHeight / 2) {
                        // 设定top的值为0(向下拉)
                        iNum = 0;
                    }
                    // 赋值给top值
                    oUl.style.top = iNum   'px';

                }, iMs);
            };

            autoPlay(toggle);

            // 获取拥有当前样式的元素
            function getClass(sName) {
                for (i = 0; i < aDiv.length; i  ) {
                    if (aDiv[i].className == sName) {
                        return aDiv[i];
                    }
                }
            }
        }

    </script>
</head>

<body>

    <div class="slide-module" id="miaovSlide">
        <!-- 向上箭头 -->
        <div class="up"></div>
        <div class="wrap">
            <ul>
                <li>
                    <a>
                        <img src="images/1.jpg" />
                    </a>
                </li>
                <li>
                    <a>
                        <img src="images/2.jpg" />
                    </a>
                </li>
                <li>
                    <a>
                        <img src="images/3.jpg" />
                    </a>
                </li>
                <li>
                    <a>
                        <img src="images/4.jpg" />
                    </a>
                </li>
            </ul>
        </div>
        <!-- 向下箭头 -->
        <div class="down"></div>
    </div>

</body>

</html>
特效
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