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通过preselect()函数只能默认到省份，城市和区无法默认，求大神帮助
html代码如下：
<body onload="setup();preselect('北京市','北京市','西城区');">
<div id="demo3" class="citys">
<form action="" method="post">
省市：<select id="s0" name="province"><option>请选择省市</option></select>
市：<select id="s1" name="city"><option>请选择城市</option></select>
区/县：<select id="s2" name="town"><option>请选择地区</option></select>
</form>
</div>
<script type="text/javascript">
var s=["s0","s1","s2"];
var opt0 = ["请选择省市","请选择城市","请选择地区"];
function setup(){
for(i=0;i<s.length-1;i++)
document.getElementById(s[i]).onchange=new Function("change("+(i+1)+")");
change(0);
}
</script>
</body>
js代码如下：
function Dsy(){
this.Items = {};
}
Dsy.prototype.add = function(id,iArray){
this.Items[id] = iArray;
}
Dsy.prototype.Exists = function(id){
if(typeof this.Items[id] == "undefined") return false;
return true;
}
function change(v){
var str="0";
for(i=0;i<v;i++){
str+=("_"+(document.getElementById(s[i]).selectedIndex-1));
}
var ss=document.getElementById(s[v]);
with(ss){
length = 0;
options[0]=new Option(opt0[v],opt0[v]);
if(v && document.getElementById(s[v-1]).selectedIndex>0 || !v){
if(dsy.Exists(str)){
ar = dsy.Items[str];
for(i=0;i<ar.length;i++)
options[length]=new Option(ar[i],ar[i]);
if(v)
options[1].selected = true;
}
}
if(++v<s.length){
change(v);
}
}
}
function preselect(p_key,c_key,t_key) {
//alert(p_key);
var index;
//var provinces = new Array("北京市", "天津市", "上海市", "重庆市", "河北省", "山西省", "内蒙古", "辽宁省", "吉林省", "黑龙江省", "江苏省", "浙江省", "安徽省", "福建省", "江西省", "山东省", "河南省", "湖北省", "湖南省", "广东省", "广西", "海南省", "四川省", "贵州省", "云南省", "西藏", "陕西省", "甘肃省", "青海省", "宁夏", "新疆", "香港", "澳门", "台湾省");
var provinces = dsy.Items[0];
var cnt = provinces.length;
//alert(cnt);
for (i = 0; i < cnt; i++) {
if (p_key == provinces[i]) {
index = i;
break;
}
}
if (index < provinces.length) {
document.getElementById(s[0]).selectedIndex = index + 1;
change(1);
}
}
var dsy = new Dsy();
dsy.add("0",["北京市","天津市","河北省","山西省","内蒙古自治区","辽宁省","吉林省","黑龙江省","上海市","江苏省","浙江省","安徽省","福建省","江西省","山东省","河南省","湖北省","湖南省","广东省","广西壮族自治区","海南省","重庆市","四川省","贵州省","云南省","西藏自治区","陕西省","甘肃省","青海省","宁夏回族自治区","新疆维吾尔自治区","台湾省","香港特别行政区","澳门特别行政区"]);
dsy.add("0_0",["北京市"]);
dsy.add("0_0_0",["东城区","西城区","朝阳区","丰台区","石景山区","海淀区","门头沟区","房山区","通州区","顺义区","昌平区","大兴区","怀柔区","平谷区","密云区","延庆区"]);
dsy.add("0_1",["天津市"]);
dsy.add("0_1_0",["和平区","河东区","河西区","南开区","河北区","红桥区","东丽区","西青区","津南区","北辰区","武清区","宝坻区","滨海新区","宁河区","静海区","蓟州区"]);
....