ajax 基础教程

var xmlrequest = (window.ActiveXObject) ? new ActiveXObject("Microsoft.XMLHTTP") : new XMLHttpRequest();

function test(){
    var action = document.forms[0].action;
    xmlrequest.open("GET", action);
    xmlrequest.onreadystatechange = callback;
    xmlrequest.send(null);
}

function callback(){
    if (xmlrequest.readyState == 4) {
        if (xmlrequest.status == 200) {
           var returntext = xmlrequest.responseText;
     var show = document.getElementById("test");
     show.innerHTML = "<table><tbody><tr><td>"+returntext+"</td></tr></tbody></table>";
        }
    }
}