“Contagem regressiva em JS” Respostas de código

Contagem regressiva em JS

function startTimer(duration, display) {
    var timer = duration, minutes, seconds;
    setInterval(function () {
        minutes = parseInt(timer / 60, 10);
        seconds = parseInt(timer % 60, 10);

        minutes = minutes < 10 ? "0" + minutes : minutes;
        seconds = seconds < 10 ? "0" + seconds : seconds;

        display.textContent = minutes + ":" + seconds;

        if (--timer < 0) {
            timer = duration;
        }
    }, 1000);
}

window.onload = function () {
    var fiveMinutes = 60 * 5,
        display = document.querySelector('#time');
    startTimer(fiveMinutes, display);
};
Xenophobic Xenomorph

contagem regressiva JavaScript

// To make a countdown you can use a for loop and console.log(msg);

console.log("We have liftoff in T minus...");
for (let i = 10; i >= 0; i--) {
	console.log(i);
}
console.log("We have liftoff!");
MattDESTROYER

JavaScript Countdown

<!DOCTYPE HTML>
<html>
<body>

<p id="demo"></p>
<button onclick="countdownTimeStart()">Start Timer</button>

<script>
// Set the date we're counting down to

function countdownTimeStart(){

var countDownDate = new Date("Sep 25, 2025 15:00:00").getTime();

// Update the count down every 1 second
var x = setInterval(function() {

    // Get todays date and time
    var now = new Date().getTime();
    
    // Find the distance between now an the count down date
    var distance = countDownDate - now;
    
    // Time calculations for days, hours, minutes and seconds
    var hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
    var minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
    var seconds = Math.floor((distance % (1000 * 60)) / 1000);
    
    // Output the result in an element with id="demo"
    document.getElementById("demo").innerHTML = hours + "h "
    + minutes + "m " + seconds + "s ";
    
    // If the count down is over, write some text 
    if (distance < 0) {
        clearInterval(x);
        document.getElementById("demo").innerHTML = "EXPIRED";
    }
}, 1000);
}
</script>

</body>
</html>
 Run code snippet
Disgusted Dove

contagem regressiva JS

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8" />
    <title>Countdown timer using HTML and JavaScript</title>
</head>

<body>
    <p id="demo"></p>

    <script>
        // Set the date we're counting down to
        var countDownDate = new Date("Jan 5, 2023 15:37:25").getTime();

        // Update the count down every 1 second
        var x = setInterval(function () {

            // Get today's date and time
            var now = new Date().getTime();

            // Find the distance between now and the count down date
            var distance = countDownDate - now;

            // Time calculations for days, hours, minutes and seconds
            var days = Math.floor(distance / (1000 * 60 * 60 * 24));
            var hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
            var minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
            var seconds = Math.floor((distance % (1000 * 60)) / 1000);

            // Display the result in the element with id="demo"
            document.getElementById("demo").innerHTML = days + "d " + hours + "h "
                + minutes + "m " + seconds + "s ";

            // If the count down is finished, write some text
            if (distance < 0) {
                clearInterval(x);
                document.getElementById("demo").innerHTML = "EXPIRED";
            }
        }, 1000);
    </script>
</body>

</html>
Evil Elephant

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