how to use setinterval and clearinterval in javascript code example

Example 1: Javascript stop setInterval

var myInterval = setInterval(function(){console.log("mmk")}, 2000);

clearInterval(myInterval); //stop that interval

Example 2: how to reset interval javascript

function myFn() {console.log('idle');}

var myTimer = setInterval(myFn, 4000);

// Then, later at some future time, 
// to restart a new 4 second interval starting at this exact moment in time
clearInterval(myTimer);
myTimer = setInterval(myFn, 4000);

Example 3: setinterval break

var refreshIntervalId = setInterval(fname, 10000);

/* later */
clearInterval(refreshIntervalId);