if something break the interval javascript code example

Example 1: setinterval break

var refreshIntervalId = setInterval(fname, 10000);

/* later */
clearInterval(refreshIntervalId);

Example 2: how to break out of setinterval

var timerId = setInterval(function(){

       if(window.document.drops.isFinished()){
           clearInterval(timerId);
       }

    },1000);