Simple clock that counts down from 30 seconds and executes a function afterward [closed]

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I have a game that gives a time limit and I need to display a countdown clock for the users and stop the game once the time is up such as 30 seconds. How can I do this in javascript?

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Use setInterval to set up a timer. Within this timer, you can update some text in your page and when the time is up, you can call whatever function you want:

var timeLeft = 30;
    var elem = document.getElementById('some_div');
    
    var timerId = setInterval(countdown, 1000);
    
    function countdown() {
      if (timeLeft == -1) {
        clearTimeout(timerId);
        doSomething();
      } else {
        elem.innerHTML = timeLeft + ' seconds remaining';
        timeLeft--;
      }
    }

<div id="some_div">
</div>

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Check out setTimeout and setInterval:

http://www.elated.com/articles/javascript-timers-with-settimeout-and-setinterval/

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You can use setTimeout() function for this like :-

let timeElm = document.getElementById('timeElm');
let timer = function(x) {
 if(x === 0) {
    return;
 }

 timeElm.innerHTML = x;

 return setTimeout(() => {timer(--x)}, 1000)
}

timer(30);

In this, we use recursion and gave it a setTimeout() of 1000ms for reducing the time.