利用jquery完成表单域的收集，利用ajax实现信息传递给服务器存储

function fu()
{
var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function()
{
if(xhr.readyState == 4 && xhr.status ==200)
{
alert(xhr.responseText);
}
}

//利用jquery val()收集表单
var name = $('#uname').val();
var pwd = $('#pwd').val();
var email = $('#email').val();
//拼装字符串
var info = 'name='+name+'&pwd='+pwd+'&email='+email;

xhr.open('post','./login.php');
xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
xhr.send(info);
}