最基础的ajax

var xmlhttp;function createHTTP(){ if(window.ActiveXObject) { xmlhttp= new ActiveXObject("Microsoft.XMLHTTP"); } else if(window.XMLHttpRequest) { xmlhttp= new XMLHttpRequest(); }}function startHTTP(){ createHTTP(); xmlhttp.onreadystatechange=StateDo; xmlhttp.open("GET","/common/UpdateNewsClickCount.aspx?ID=20090314105851",true); xmlhttp.send(null);}function StateDo(){ if(xmlhttp.readystate==4) { if(xmlhttp.status==200) { alert(xmlhttp.responsetext); } }}startHTTP();