javascript dom 动态创建省市纵向列表菜单

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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>动态创建纵向列表</title>
    <style type="text/css">
        a { color: #000; text-decoration: none; }
        a:hover { color: #F00; }
        #menu { width: 100px; border: 1px solid #CCC; border-bottom:none;}
        #menu ul { list-style: none; margin: 0px; padding: 0px; }
        #menu ul li { background: #eee; padding: 0px 8px; height: 26px; line-height: 26px; border-bottom: 1px solid #CCC; position:relative; }
        #menu ul li ul { display:none; position: absolute; left: 100px; top: 0px; width:100px;border:1px solid #ccc; border-bottom:none; }
        #menu ul li.current ul { display:block;}
        #menu ul li ul li{text-align:center;}    /*设置城市内容居中*/
    </style>
    <script type="text/javascript">
        var provs = { "江西省": ["南昌市", "景德镇", "九江", "鹰潭", "萍乡", "新馀", "赣州", "吉安", "宜春", "抚州", "上饶"],
            "福建省": ["福州", "厦门", "莆田", "三明", "泉州", "漳州", "南平", "龙岩", "宁德"],
            "河北省": ["石家庄", "邯郸", "邢台", "保定", "张家口", "承德", "廊坊", "唐山", "秦皇岛", "沧州", "衡水"],
            "四川省": ["成都市", "自贡市", "攀枝花市", "泸州市", "德阳市", "绵阳市", "广元市", "遂宁市", "内江市", "乐山市", "南充市", "眉山市", "宜宾市", "广安市", "达州市", "雅安市", "巴中市", "资阳市", "阿坝藏族羌族自治州", "甘孜藏族自治州", "凉山彝族自治州"],
            "山西省": ["太原市", "大同市", "阳泉市", "长治市", "晋城市", "朔州市", "晋中市", "运城市", "忻州市", "临汾市", "吕梁市"],
            "内蒙古": ["呼和浩特市", "包头市", "乌海市", "赤峰市", "通辽市", "鄂尔多斯市", "呼伦贝尔市", "巴彦淖尔市", "乌兰察布市", "兴安盟", "锡林郭勒盟", "阿拉善盟"],
            "海南省": ["海口市", "三亚市"], "重庆市": ["重庆"],
            "贵州省": ["贵阳市", "六盘水市", "遵义市", "安顺市", "铜仁地区", "黔西南布依族苗族自治州", "毕节地区", "黔东南苗族侗族自治州", "黔南布依族苗族自治州"],
            "甘肃省": ["兰州市", "嘉峪关市", "金昌市", "白银市", "天水市", "武威市", "张掖市", "平凉市", "酒泉市", "庆阳市", "定西市", "陇南市", "临夏回族自治州", "甘南藏族自治州"],
            "青海省": ["西宁市", "海东地区", "海北藏族自治州", "黄南藏族自治州", "海南藏族自治州", "果洛藏族自治州", "玉树藏族自治州", "海西蒙古族藏族自治州"],
            "宁夏自治区": ["银川市", "石嘴山市", "吴忠市", "固原市", "中卫市"]
        };
        function iniEvent() {
            var provUL = document.getElementById("prov");
            if (provUL) {
                var allli = provUL.getElementsByTagName("li");
                for (i = 0; i < allli.length; i++) {
                    node = allli[i];
                    node.onmouseover = function () {        //鼠标经过时显示层
                        this.className = "current";
                    }
                    node.onmouseout = function () {         //鼠标离开时隐藏层
                        this.className = this.className.replace("current", "");
                    }
                }
            }
        }
        function loadData() {
            var provUL = document.getElementById("prov");
            var nIndex = 0;
            for (var key in provs) {
                var provLi = document.createElement("li");
                provLi.id = "provLI" + nIndex;
                provLi.innerHTML = "<a href='#'>" + key + "</a>";
                provUL.appendChild(provLi);        //添加省份li
                //================添加城市========================
                var citys = provs[key];
                if (citys.length > 0) {
                    var cityUL = document.createElement("ul");
                    var maxLength = 0; //存放最大城市内容的长度，以便后面设置cityUL的最大宽度，达到宽度自适应
                    for (var i = 0; i < citys.length; i++) {
                        var cityName = citys[i];
                        if (cityName.length > maxLength) {
                            maxLength = cityName.length; //提取最大长度的城市
                        }
                        var cityLI = document.createElement("li");
                        cityLI.id = "cityLI" + i;
                        cityLI.innerHTML = "<a href='#'>" + cityName + "</a>";
                        cityUL.appendChild(cityLI);

                    }
                    if (maxLength <= 6) {
                        maxLength = 100;
                    }
                    else {
                        maxLength = maxLength * 20;   //这里乘以20主要是按一个字20px来算
                    }
                    maxLength = maxLength + "px";    //加上像素的px后缀
                    cityUL.style.width= maxLength;     //设置cityUL的最大宽度
                    provLi.appendChild(cityUL);          //添加城市UL
                }
                nIndex++;
            }
            iniEvent();   //初始化事件
        }
    </script>
</head>
<body onload ="loadData()">
    <div id="menu">
        <ul id="prov">
        </ul>
    </div>
</body>
</html>