php Ajax Post 传值

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建一个PHP文件，页面存为ajax_output.php

<?
     echo $_POST['user_name'];
     echo $_POST['user_age'];
     echo $_POST['user_sex'];
?>

以下页面存为ajax.php

<head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>

<script language="javascript">
function saveUserInfo()
{
//获取接受返回信息层
var msg = document.getElementById("msg");

//获取表单对象和用户信息值
var f = document.user_info;
var userName = f.user_name.value;
var userAge = f.user_age.value;
var userSex = f.user_sex.value;

//接收表单的URL地址
//var url = "/ajax_output.php";
var url = "ajax_output.php";

//需要POST的值，把每个变量都通过&来联接
var postStr = "user_name="+ userName +"&user_age="+ userAge +"&user_sex="+ userSex;

//实例化Ajax
//var ajax = InitAjax();

   var ajax = false;
   //开始初始化XMLHttpRequest对象
   if(window.XMLHttpRequest) { //Mozilla 浏览器
   ajax = new XMLHttpRequest();
   if (ajax.overrideMimeType) {//设置MiME类别
   ajax.overrideMimeType("text/xml");
   }
   }
   else if (window.ActiveXObject) { // IE浏览器
   try {
   ajax = new ActiveXObject("Msxml2.XMLHTTP");
   } catch (e) {
   try {
   ajax = new ActiveXObject("Microsoft.XMLHTTP");
   } catch (e) {}
   }
   }
   if (!ajax) { // 异常，创建对象实例失败
   window.alert("不能创建XMLHttpRequest对象实例.");
   return false;
   }




//通过Post方式打开连接
ajax.open("POST", url, true);

//定义传输的文件HTTP头信息
ajax.setRequestHeader("Content-Type","application/x-www-form-urlencoded");

//发送POST数据
ajax.send(postStr);

//获取执行状态
ajax.onreadystatechange = function() {
   //如果执行状态成功，那么就把返回信息写到指定的层里
   if (ajax.readyState == 4 && ajax.status == 200) {
   msg.innerHTML = ajax.responseText;
   }
}
}
</script>
<body >
<div id="msg"></div>
<form name="user_info" method="post" action="">
姓名：<input type="text" name="user_name" /><br />
年龄：<input type="text" name="user_age" /><br />
性别：<input type="text" name="user_sex" /><br />

<input type="button" value="提交表单" onClick="saveUserInfo()">
</form>

</body>
</html>