I have seen many ways to write
xmlHttp.open("post", "test.php",true);
xmlHttp.send(formData);
xmlHttp.onreadystatechange = function(){ }
xmlHttp.onreadystatechange first
xmlHttp.onreadystatechange = function(){ }
xmlHttp.open("post", "test.php",true);
xmlHttp.send(formData); there is another such
xmlhttp.open ("POST", "Demo", true);
xmlhttp.onreadystatechange=myCallBack;
xmlhttp.setRequestHeader ("Content-Type", "application/x-www-form-urlencoded;charset=UTF-8");
xmlhttp.send ("FirstName=Nat&LastName=Dunn");
excuse me,
xmlHttp.open
xmlHttp.send
xmlHttp.onreadystatechange =