Ajax post 提交数据

<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 = “commit.ASPX”;     
    //需要POST的值，把每个变量都通过&来联接 
    var postStr = “name=”+ userName +”&age=”+ userAge +”&sex=”+ userSex;

    //实例化Ajax
    var ajax = null;
    if(window.XMLHttpRequest){
        ajax = new XMLHttpRequest();
       }
    else if(window.ActiveXObject){
        ajax = new ActiveXObject(”Microsoft.XMLHTTP”);
       }
    else{
        return;
       }

    //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);

    //返回数据的处理函数
    ajax.onreadystatechange = function(){
        if (ajax.readyState == 4 && ajax.status == 200){
               msg.innerHTML = ajax.responseText;
            }
      }
}

–>
</SCRIPT>

<form name=”user_info”>
     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>

//构建一个接受返回信息的层:
<div id=”msg”></div>