把ajax放在VanillaJS中

Question

如何根据状态变化暂停ajax？任何帮助将不胜感激！

var myRequest = new XMLHttpRequest();

myRequest.onreadystatechange = function(){
            var state = myRequest.readyState,
            //if state === 2 wait for 5 secs and then continue???


}   

myRequest.open("GET", "forAjax.html", true);
myRequest.send();