每隔X分钟用AJAX调用一个文件，直到Y时间?

I have the following code

我有以下代码

$(document).ready(function() {
    $.ajaxSetup({ cache: false }); // This part addresses an IE bug. without it, IE will only load the first number and will never refresh
    setInterval(function() {
        $('#chatresults').load('includes/chat.php');
    }, 3000); // the "3000" here refers to the time to refresh the div. it is in milliseconds.
});
$(document