调用js时，提示缺少对象
在看一个网页代码时，发现下面一处代码：
<!-- 搜索、人数 -->
<div id="soren">
<div class="search">
<form action="cp.php" method="get">
<input type="hidden" name="ac" value="friend">
<input type="hidden" name="op" value="search">
<input type="hidden" name="all" value="yes">
<input type="hidden" name="searchsubmit" value="找人">
<input type="hidden" name="searchmode" value="1">
<b>快速搜索</b>  我要找 <select name="sex" size="1"><option value="2"> 美女</option><option value="1">帅哥</option></select>  
年龄<input type="text" name="startage" value="18" size="2" class="t_input" />  到  
<input type="text" name="endage" value="32" size="2" class="t_input" />  
地区   <span id="residecitybox1"></span>
<script type="text/javascript">showprovince('resideprovince', 'residecity', '', 'residecitybox1');showcity('residecity', '', 'resideprovince', 'residecitybox1');</script>  
<input type="checkbox" name="avatar" value="1" class="in">有照片 
<input type="submit" class="submit" value="开始搜索">
</form>
</div>
</div>
<!-- 搜索、人数end -->

其使用的JS文件，也导入了，JS内容大致如下 ：

function showprovince(provinceid, cityid, province, boxid) {
var provinces = new Array(
"北京", "上海", "重庆", "安徽", "福建", "甘肃", "广东", "广西", "贵州", "海南", "河北", "黑龙江", "河南",
"香港", "湖北", "湖南", "江苏", "江西", "吉林", "辽宁", "澳门", "内蒙古", "宁夏", "青海", "山东",
"山西", "陕西", "四川", "台湾", "天津", "新疆", "西藏", "云南", "浙江"
);
/*var provinces = new Array(
"北京", "上海", "重庆", "安徽", "福建", "甘肃", "广东", "广西", "贵州", "海南", "河北", "黑龙江", "河南",
"香港", "湖北", "湖南", "江苏", "江西", "吉林", "辽宁", "澳门", "内蒙古", "宁夏", "青海", "山东",
"山西", "陕西", "四川", "台湾", "天津", "新疆", "西藏", "云南", "浙江", "海外"
);*/

var selObj = document.createElement("select");
selObj.name = provinceid;
selObj.id = provinceid;
selObj.onchange = function() {
setcity(provinceid, cityid);
};
$(boxid).appendChild(selObj);

selObj.options[0] = new Option("选择省份", "");
var j = 0;
for(var i = 0; i < provinces.length; i++) {
j = i + 1;
selObj.options[j] = new Option(provinces[i], provinces[i]);
}

initprovcity(provinceid, province);

}

function showcity(cityid, city, provinceid, boxid) {
if(isUndefined(provinceid)) provinceid = '';

var selObj = document.createElement("select");
selObj.name = cityid;
selObj.id = cityid;
$(boxid).appendChild(selObj);
if(city == "") {

selObj.options[0] = new Option("选择城市", "");
} else {
selObj.options[0] = new Option(city, city);
}

if(provinceid != '') {
setcity(provinceid, cityid);
initprovcity(cityid, city);
}
}

function showcity(cityid, city, provinceid, boxid) {
if(isUndefined(provinceid)) provinceid = '';

var selObj = document.createElement("select");
selObj.name = cityid;
selObj.id = cityid;
$(boxid).appendChild(selObj);
if(city == "") {
selObj.options[0] = new Option("选择城市", "");
} else {
selObj.options[0] = new Option(city, city);
}

if(provinceid != '') {
setcity(provinceid, cityid);
initprovcity(cityid, city);
}
}

function setcity(provinceid, cityid) {}

我把这些代码复制下来，自己运行，在网页上提示缺少对象。
显示结果来看，只有地区，包括选择省份和城市，没有显示出来。
不知何因，请高手帮忙。

[解决办法]
最下面的setcity(provinceid, cityid){}
方法是空的
你要在这个方法里面
把选定的省里面的所有的市都加在一个select标签里面
[解决办法]

HTML code

<script>function $(id){return document.getElementById(id)}    //添加的函数function isUndefined(x){return x == undefined}    //添加的函数function showprovince(provinceid, cityid, province, boxid) {var provinces = new Array("北京", "上海", "重庆", "安徽", "福建", "甘肃", "广东", "广西", "贵州", "海南", "河北", "黑龙江", "河南","香港", "湖北", "湖南", "江苏", "江西", "吉林", "辽宁", "澳门", "内蒙古", "宁夏", "青海", "山东","山西", "陕西", "四川", "台湾", "天津", "新疆", "西藏", "云南", "浙江");var selObj = document.createElement("select");selObj.name = provinceid;selObj.id = provinceid;selObj.onchange = function() {setcity(provinceid, cityid);};$(boxid).appendChild(selObj);selObj.options[0] = new Option("选择省份", "");var j = 0;for(var i = 0; i < provinces.length; i++) {j = i + 1;selObj.options[j] = new Option(provinces[i], provinces[i]);}//initprovcity(provinceid, province);    //缺少这个函数暂时注释掉}function showcity(cityid, city, provinceid, boxid) {if(isUndefined(provinceid)) provinceid = '';var selObj = document.createElement("select");selObj.name = cityid;selObj.id = cityid;$(boxid).appendChild(selObj);if(city == "") {selObj.options[0] = new Option("选择城市", "");} else {selObj.options[0] = new Option(city, city);}if(provinceid != '') {setcity(provinceid, cityid);//initprovcity(cityid, city); //缺少这个函数暂时注释掉}}function setcity(provinceid, cityid) {}</script><!-- 搜索、人数 --><div id="soren"><div class="search">  <form action="cp.php" method="get"><input type="hidden" name="ac" value="friend"><input type="hidden" name="op" value="search"><input type="hidden" name="all" value="yes"><input type="hidden" name="searchsubmit" value="找人"><input type="hidden" name="searchmode" value="1"><b>快速搜索</b>  我要找 <select name="sex" size="1"><option value="2"> 美女</option><option value="1">帅哥</option></select>  年龄<input type="text" name="startage" value="18" size="2" class="t_input" />  到  <input type="text" name="endage" value="32" size="2" class="t_input" />  地区   <span id="residecitybox1"></span><script type="text/javascript">showprovince('resideprovince', 'residecity', '', 'residecitybox1');showcity('residecity', '', 'resideprovince', 'residecitybox1');</script>  <input type="checkbox" name="avatar" value="1" class="in">有照片 <input type="submit" class="submit" value="开始搜索"></form></div>  </div><!-- 搜索、人数end -->