Question

我刚开始使用js而且我不知道为什么它不倒计时。有小费吗？（当我使用setInterval）时它也不起作用。

当eventDate是一种任何通常的日期，如

var eventDate =new date (2016,12,25);

它有效。控制台没有显示任何错误。

    
        function countdown() {
            var now = Date.parse(new Date);
            var eventDate = new Date(now + 1800000);
    
            var remTime = eventDate - now;
    
            var s = Math.floor(remTime / 1000);
            var m = Math.floor(s / 60);
    
            m %= 60;
            s %= 60;
    
            m = (m < 10) ? "0" + m : m;
            s = (s < 10) ? "0" + s : s;
    
            document.getElementById("minutes").textContent = m;
            document.getElementById("seconds").textContent = s;
    
            setTimeout("countdown()", 1000);
        }
    
        countdown();

body {
                 background: #f6f6f6;
             }
    
             .countdownContainer {
                 position: absolute;
                 top: 50%;
                 left: 50%;
                 transform: translateX(-50%) translateY(-50%);
                 text-align: center;
                 background: #ddd;
                 border: 1px solid #ddd;
                 padding: 10px;
                 box-shadow: 0 0 5px 3px #ccc;
             }
    
             .info {
                 font-size: 80px;
             }

<!DOCTYPE html>
    <html>
    <head>
        <title>Christmas Countdown</title>
       
    </head>
    <body>
    <table class="countdownContainer">
        <tr class="info">
            <td colspan="4">Christmas Countdown</td>
        </tr>
        <tr class="info">
            <td id="minutes">12</td>
            <td id="seconds">22</td>
        </tr>
        <tr>
            <td>Minutes</td>
            <td>Seconds</td>
        </tr>
    </table>
    </body>
    </html>

Answer 1

这里有一些错误，一个是代码，第二个是函数的逻辑。

首先，您需要在setTimeout中传递函数，因此它应该是setTimeout(countdown, 100);

其次在你正在计算的逻辑中

var now = Date.parse(new Date);

var eventDate = new Date(now + 1800000);

然后计算两者的参数，这将导致每个循环的值相同。

＆＃13;

var eventDate = new Date(Date.parse(new Date) + 1800000);

function countdown() {
  var now = Date.parse(new Date);


  var remTime = eventDate - now;

  var s = Math.floor(remTime / 1000);
  var m = Math.floor(s / 60);

  m %= 60;
  s %= 60;

  m = (m < 10) ? "0" + m : m;
  s = (s < 10) ? "0" + s : s;

  document.getElementById("minutes").innerHTML = m;
  document.getElementById("seconds").innerHTML = s;

  setTimeout(countdown, 1000);
}

countdown();

＆＃13;

body {
  background: #f6f6f6;
}
.countdownContainer {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translateX(-50%) translateY(-50%);
  text-align: center;
  background: #ddd;
  border: 1px solid #ddd;
  padding: 10px;
  box-shadow: 0 0 5px 3px #ccc;
}
.info {
  font-size: 80px;
}

＆＃13;

<table class="countdownContainer">
  <tr class="info">
    <td colspan="4">Christmas Countdown</td>
  </tr>
  <tr class="info">
    <td id="minutes">12</td>
    <td id="seconds">22</td>
  </tr>
  <tr>
    <td>Minutes</td>
    <td>Seconds</td>
  </tr>
</table>

＆＃13;

setTimeout不起作用

1 个答案: