html/index6.html at master · wodesj33/html · GitHub

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<!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>
    <title>11</title>
    <style type="text/css">
        .top-nav {
            font-size: 14px;
            font-weight: bold;
            list-style: none;
        }

        .top-nav li {
            float: left;
            margin-right: 1px;
        }

        .top-nav li a {
            line-height: 34px;
            text-decoration: none;
            background: #3f240e;
            color: #fff;
            display: block;
            width: 80px;
            text-align: center;
        }

        .top-nav ul {
            list-style: none;
            padding: 0;
            position: absolute;
            height: 0;
            overflow: hidden;
        }

        .top-nav li a:hover {
            background: url(http://img.mukewang.com/5461b50d0001e28000010034.jpg) 0 0 repeat-x;
        }

        .note {
            color: #3f240e;
            display: block;
            background: url(http://img.mukewang.com/5461b50d0001e28000010034.jpg) 0 0 repeat-x;
        }

        .corner {
            display: block;
            height: 11px;
            background: url(http://img.mukewang.com/5461b5620001410d00170011.jpg) 31px 0 no-repeat;
        }
    </style>
    <script type="text/javascript">
        window.onload = function () {

            //鼠标经过时的效果
            var Lis = document.getElementsByTagName("li");
            for (var i = 0; i < Lis.length; i++) {
                Lis[i].onmouseover = function () {
                    var u = this.getElementsByTagName("ul")[0];
                    if (u != undefined) {
                        ChangeH(u.id, 1);
                    }
                }
                Lis[i].onmouseleave = function () {
                    var u = this.getElementsByTagName("ul")[0];
                    if (u != undefined) {
                        ChangeH(u.id, -1);
                    }
                }
            }


        }

        function ChangeH(id, count) {
            //	根据ID找到ulList，同时得到其高度
            var ulList = document.getElementById(id);
            var h = ulList.offsetHeight;
            h += count;
            if (count > 0) {
                if (h <= 42) {
                    //	将高度赋值给ulList，同时，不断调用本函数
                    ulList.style.height = h + "px";
                    ulList.style.display = "block";

                    setTimeout("ChangeH('" + id + "',1)", 10);
                } else {
                    return;
                }
            } else {
                if (h > 0) {
                    //	将高度赋值给ulList，同时，不断调用本函数
                    ulList.style.height = h + "px";
                    setTimeout("ChangeH('" + id + "',-1)", 10);
                } else {
                    ulList.style.display = "none";
                    return;
                }
            }
        }
    </script>
</head>

<body>
    <ul class="top-nav">
        <li>
            <a href="#">
                <span class="note">慕课网</span>
            </a>
        </li>
        <li>
            <a href="#">课程大厅</a>
        </li>
        <li>
            <a href="#">学习中心</a>
            <ul id="mnuUL">
                <span class="corner"></span>
                <li>
                    <a href="#">前端课程 </a>
                </li>
                <li>
                    <a href="#">手机开发</a>
                </li>
                <li>
                    <a href="#">后台编程</a>
                </li>
            </ul>
        </li>
        <li>
            <a href="#">关于我们</a>
        </li>
    </ul>
</body>

</html>