Answers for "how to use timer on js"

timer in javascript

//single event i.e. alarm, time in milliseconds
var timeout = setTimeout(function(){yourFunction()},10000);
//repeated events, gap in milliseconds
var interval = setInterval(function(){yourFunction()},1000);

how to set timer in javascript

var count = 0;
  function updateCount() {
   count = count + 1;
   document.getElementById("number").innerHTML = count;
   setTimeout(updateCount, 1000);
  }