ajax的下拉框联动
<html>
<body>
<script language="JavaScript">
var req = null;
function test() {
var province = document.all("province").value;
req = new ActiveXObject("Microsoft.XMLHTTP");
//设置属性，当后台处理完成后，回来调用myDeal方法。
req.onreadystatechange = myDeal;
//发出请求
req.open("GET", "c.jsp?province=" + province, "false");
req.send(null);
}
function myDeal() {
if (req.readyState == 4) {
//接收服务端返回的数据
var ret = req.responseText;
//处理数据
var obj = document.all("city");
for (var i = obj.options.length - 1; i >= 0; i--) {
obj.options.remove(i); //从后往前删除
}
var ops = ret.split("|");
for (var i = 0; i < ops.length; i++) {
var op = ops[i];
var ss = op.split(",");
var oOption = document.createElement("OPTION"); //创建一个OPTION节点
obj.options.add(oOption); //将节点加入city选项中
�
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