Ajax的post提交数据 代码和原理:

<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>

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