php - Ajax Method without XMLHttpRequest() Object -

i have 1 query ajax methodology. used work ajax use 4 simple lines written below:

$.ajax({             type: "post",             url: "/application/group/addmembers",             data: {memberids: selectedmembers, groupid:<?php echo $this->groupid; ?>},             success: (function(msg) {               // alert(msg);                 var ans = json.parse(msg);                 alert(ans['message']); // msg array returned php script in json             })         }); 

now, when study more on different sites or tutorials. ajax creating xmlhtmlrequest(), used exchange information server. , more things open, send functions.

but don't create xmlhtmlrequest object , ajax still works fine. want know difference. lose when don't communicate server using xmlhtmlrequest object. did search on it. still need answer.

the difference between 4 simple line , xmlhttprequest() language xmlhttprequest() pure javascript while code above jquery. infact ignore both , use jquery.get() & jquery.load() higher-level alternatives , easier use. if less common options required, though, $.ajax() can used more flexibly.