form1.province;
var city = document.form1.city;
//指定省份下拉中<option>标记的个数
province.length = arr_province.length;
//循环将arr_province中的数据写入到<option>标记中
for(var i=0;i<arr_province.length;i++)
{
province.options[i].text = arr_province[i];
province.options[i].value = arr_province[i];
}
//修改省份列表中默认选择项
var index = 0;
province.selectedIndex = index;
//指定城市下拉中<option>标记的个数
city.length = arr_city[index].length;
//循环将arr_city中对应的数据写入到<option>标记中
for(var j=0;j<arr_city[index].length;j++)
{
city.options[j].text = arr_city[index][j];
city.options[j].value = arr_city[index][j];
}
}
function changeSelect(index)
{
//获取name=city的对象
var city = document.form1.city;
//指定城市下拉中<option>标记的个数
city.length = arr_city[index].length;
//循环将arr_city中对应的数据写入到<option>标记中
for(var j=0;j<arr_city[index].length;j++)
{
city.options[j].text = arr_city[index][j];
city.options[j].value = arr_city[index][j];
}
}
</script>
</head>
<body>
<form name="form1" method="post" action="login.php">
省份：<select name="province" onchange="changeSelect(this.selectedIndex)"></select>
城市：<select name="city"></select>
</form>
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