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Javascript制作伸缩的二级菜单

<style>        #navigation {            width: 200px;            font-family: Arial;        }        #navigation > ul {            list-style-type: none;            /* 不显示项目符号 */                        margin: 0px;            padding: 0px;        }        #navigation > ul > li {            border-bottom: 1px solid #ED9F9F;            /* 添加下划线 */        }        #navigation > ul > li > a {            display: block;            /* 区块显示 */                        padding: 5px 5px 5px 0.5em;            text-decoration: none;            border-left: 12px solid #711515;            /* 左边的粗红边 */                        border-right: 1px solid #711515;            /* 右侧阴影 */        }        #navigation > ul > li > a:link,        #navigation > ul > li > a:visited {            background-color: #c11136;            color: #FFFFFF;        }        #navigation > ul > li > a:hover {            /* 鼠标经过时 */                        background-color: #990020;            /* 改变背景色 */                        color: #ffff00;            /* 改变文字颜色 */        }        /* 子菜单的CSS样式 */                #navigation ul li ul {            list-style-type: none;            margin: 0px;            padding: 0px 0px 0px 0px;        }        #navigation ul li ul li {            border-top: 1px solid #ED9F9F;        }        #navigation ul li ul li a {            display: block;            padding: 3px 3px 3px 0.5em;            text-decoration: none;            border-left: 28px solid #a71f1f;            border-right: 1px solid #711515;        }        #navigation ul li ul li a:link,        #navigation ul li ul li a:visited {            background-color: #e85070;            color: #FFFFFF;        }        #navigation ul li ul li a:hover {            background-color: #c2425d;            color: #ffff00;        }        #navigation ul li ul.myHide {            /* 隐藏子菜单 */                        display: none;        }        #navigation ul li ul.myShow {            /* 显示子菜单 */                        display: block;        }    </style>        <script type="text/javascript">            function changemenu() {                //通过父元素li,找到兄弟元素ul                var bList = this.parentNode.getElementsByTagName("ul")[0];                //CSS交替更换来实现显、隐                if (bList.className == "myHide")                    bList.className = "myShow";                else                    bList.className = "myHide";            }            window.onload = function() {                var oList = document.getElementById("listUL");                var nList = oList.childNodes; //子元素                var sList;                for (var i = 0; i < nList.length; i++) {                    //如果子元素为li,且这个li有子菜单ul                    if (nList[i].tagName == "LI" && nList[i].getElementsByTagName("ul").length) {                        slist = nList[i].firstChild; //找到超链接                        slist.onclick =  changemenu; //动态添加点击函数                    }                }            }        </script>        <div>            <div id="navigation">                <ul id="listUL">                    <li><a href="#">Home</a>                    </li>                    <li><a href="#">News</a>                        <ul class="myHide">                            <li><a href="#">Lastest News</a>                            </li>                            <li><a href="#">All News</a>                            </li>                        </ul>                    </li>                    <li><a href="#">Sports</a>                        <ul class="myHide">                            <li><a href="#">Basketball</a>                            </li>                            <li><a href="#">Football</a>                            </li>                            <li><a href="#">Volleyball</a>                            </li>                        </ul>                    </li>                    <li><a href="#">Weather</a>                        <ul class="myHide">                            <li><a href="#">Today‘s Weather</a>                            </li>                            <li><a href="#">Forecast</a>                            </li>                        </ul>                    </li>                    <li><a href="#">Contact Me</a>                    </li>                </ul>            </div>        </div>

 

Javascript制作伸缩的二级菜单