Answers for "how to write a timer js"

timer in java script

var delayInMilliseconds = 1000; //1 second

setTimeout(function() {
  //your code to be executed after 1 second
}, delayInMilliseconds);

How to make a timer in javascript

// this example takes 2 seconds to run
const start = Date.now();

// After a certain amount of time, run this to see how much time passed.
const milliseconds = Date.now() - start;

console.log('Seconds passed = ' + millis / 1000);
// Seconds passed = *Time passed*