带有倒计时变量的 Whatsapp 共享按钮

Question

网络编码的初学者，我有一个问题来编写一个共享按钮，该按钮会导致 whatsapp 并共享倒计时。 我用静态字符串实现了它，但我无法在其中加载变量......

有人知道我的问题出在哪里吗？

   <script>
// Set the date we're counting down to
var countDownDate = new Date("Aug 20, 2022 12:00:00").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);

var countdown_iam = days + "j " + hours + "h "
+ minutes + "m " + seconds + "s "

// Output the result in an element with id="countdown"
document.getElementById("countdown").innerHTML = countdown_iam;

// If the count down is over, write some text 
if (distance < 0) {
    clearInterval(x);
    document.getElementById("countdown").innerHTML = "SURPRISE!!!";
}
}, 1000);

function openWhatsApp() {
    //var countdown_whatsapp = "test";
    //alert(countdown_iam);
    window.open('whatsapp://send?text=' + countdown_iam);
    }

</script>

<h2> WhatsApp sharing Link </h2> 

<!-- create an image icon to open the WhatsApp onclick -->     
<img src="img/whatsapp.png" height="50" size="50" onclick="openWhatsApp()">

感谢您的帮助

Answer 1

countdown_iam 变量是在函数内创建的，并且仅存在于该函数内。所以当其他函数（openWhatsApp）尝试使用该变量时，找不到它，就会出现错误。

您想从两个不同的函数访问倒计时字符串，因此一种选择是创建一个新函数来生成倒计时字符串并返回它。然后，您可以从两个地方调用该函数。我在这里做了：

<script>

  function getCountdown() {
    var countdownDate = new Date("Aug 20, 2022 12:00:00").getTime();
    var now = new Date().getTime();
    var distance = (countdownDate - now) / 1000;
    if (distance < 0) {
      return 'SURPRISE!!!';
    } else {
      var days = Math.floor(distance / (60 * 60 * 24));
      var hours = Math.floor((distance % (60 * 60 * 24)) / (60 * 60));
      var minutes = Math.floor((distance % (60 * 60)) / 60);
      var seconds = Math.floor(distance % 60);
      return days + "j " + hours + "h " + minutes + "m " + seconds + "s ";
    }
  }

  function openWhatsApp() {
    alert('whatsapp://send?text=' + getCountdown());
  }

  setInterval(function() {
    document.getElementById("countdown").innerHTML = getCountdown();
  }, 1000);

</script>

<h2>WhatsApp Sharing Link</h2>
<p id="countdown"></p>
<p><img src="img/whatsapp.png" height="50" size="50" onclick="openWhatsApp()"></p>