<html>
<head>
<title></title>
<script language="javascript" type="text/javascript">
function ChangeItem(){
form1.Select2.selectedIndex=form1.Select1.selectedIndex
//SelectedIndex表示控件对象中当前选定条目的从零开始的索引,如果未选定任何项，则返回值为-1.
}
</script>
<body>
<form id="form1" runat="server">
<select name="Select1" style=" 69px" onchange="ChangeItem()">
<option value="吉林省">吉林省</option>
<option value="山西省">山西省</option>
<option value="河北省">河北省</option>
<option value="河南省">河南省</option>
<option value="辽宁省">辽宁省</option>
<option value="黑龙江省">黑龙江省</option>
<option value="北京市">北京市</option>
<option value="天津市">天津市</option>
<option value="上海市">上海市</option>
<option value="陕西省">陕西省</option>
<option value="江苏省">江苏省</option> <option value="江西省">江西省</option>
<option value="四川省">四川省</option>
<option value="安徽省">安徽省</option>
<option value="浙江省">浙江省</option>
<option value="湖北省">湖北省</option>
</select>
<select name="Select2" style=" 67px">
<option value="长春市">长春市</option>
<option value="太原市">太原市</option>
<option value="石家庄市">石家庄市</option>
<option value="郑州市">郑州市</option>
<option value="沈阳市">沈阳市</option>
<option value="哈尔滨市">哈尔滨市</option>
<option value="北京市">北京市</option>
<option value="天津市">天津市</option>
<option value="上海市">上海市</option>
<option value="西安市">西安市</option>
<option value="南京市">南京市</option>
<option value="南昌市">南昌市</option>
<option value="成都市">成都市</option>
<option value="合肥市">合肥市</option>
<option value="杭州市">杭州市</option>
<option value="武汉市">武汉市</option>
</select>
</form>
</body>
</head>
</html>
<?php
echo $_POST['province'];
echo $_POST['city'];
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<script language="JavaScript" type="text/javascript">
//定义了城市的二维数组，里面的顺序跟省份的顺序是相同的。通过selectedIndex获得省份的下标值来得到相应的城市数组
var city=[
["北京","天津","上海","重庆"],
["南京","苏州","南通","常州"],
["福州","福安","龙岩","南平"],
["广州","潮阳","潮州","澄海"],
["兰州","白银","定西","敦煌"]
];
function getCity(){
//获得省份下拉框的对象
var sltProvince=document.form1.province;
//获得城市下拉框的对象
var sltCity=document.form1.city;
//得到对应省份的城市数组
var provinceCity=city[sltProvince.selectedIndex - 1];
//清空城市下拉框，仅留提示选项
sltCity.length=1;
//将城市数组中的值填充到城市下拉框中
for(var i=0;i<provinceCity.length;i++){
sltCity[i+1]=new Option(provinceCity[i],provinceCity[i]);
}
}
</script>
</HEAD>
<BODY>
<FORM METHOD=POST ACTION="index3.php" name="form1">
<SELECT NAME="province" onChange="getCity()">
<OPTION VALUE="0">请选择所在省份 </OPTION>
<OPTION VALUE="直辖市">直辖市 </OPTION>
<OPTION VALUE="江苏省">江苏省 </OPTION>
<OPTION VALUE="福建省">福建省 </OPTION>
<OPTION VALUE="广东省">广东省 </OPTION>
<OPTION VALUE="甘肃省">甘肃省 </OPTION>
</SELECT>
<SELECT NAME="city">
<OPTION VALUE="0">请选择所在城市 </OPTION>
</SELECT>
<input type="submit" value="提交"/>
</FORM>
</BODY>
</HTML>
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