在VanillaJS中搁置ajax

How to put ajax on hold based on the state change? Any help will be appreciated!

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();