JavaScript的变量值如何传给PHP使用?

var xHRObject = false;
//这里是判断浏览器
if (window.XMLHttpRequest)
{
xHRObject = new XMLHttpRequest();
}
else if (window.ActiveXObject)
{
xHRObject = new ActiveXObject("Microsoft.XMLHTTP");
}

function addFlight()
{
var number = document.getElementById("number").value;
var from = document.getElementById("from").value;
var time = document.getElementById("time").value;
var status = document.getElementById("status").value;
xHRObject.open("GET", "xxx.php?id=" + Number(new Date) +"&number=" + number+"&from=" + from+"&time=" + time+"&status=" + status, true);//这里就是你要传入的参数
xHRObject.onreadystatechange = getData;//这个是php返回结果后要执行的函数
xHRObject.send(null);
}

function getData()
{
if ((xHRObject.readyState == 4) &&(xHRObject.status ==