What is a JavaScript to make a countdown timer from ten seconds that is activated by button?

Answer 1

You can create a countdown timer in JavaScript by using the setInterval function. First, set up an HTML button that triggers the countdown. When the button is clicked, initialize a variable to 10 and use setInterval to decrement the variable every second, updating the display. Here's a simple example:

<button id="startButton">Start Countdown</button>
<div id="timer">10</div>

<script>
  document.getElementById('startButton').onclick = function() {
    let timeLeft = 10;
    const timerDisplay = document.getElementById('timer');
    
    const countdown = setInterval(() => {
      if (timeLeft <= 0) {
        clearInterval(countdown);
      } else {
        timerDisplay.textContent = timeLeft;
        timeLeft--;
      }
    }, 1000);
  };
</script>