当我在移动设备上查看时倒计时消失

Question

这是我使用的 html 和 css 代码。当我在移动设备上查看或缩小屏幕时，倒计时会消失，但文本不会。我已经添加了 css 的另一部分。现在我添加了页面的所有 css，所以上半部分来自我在 html 中使用的导航栏。我也添加了 JS。我希望有人知道如何解决这个问题。先感谢您！我还添加了整个 html。我希望你知道所有问题的解决方案！

(function () {
  const second = 1000,
        minute = second * 60,
        hour = minute * 60,
        day = hour * 24;

  let birthday = "Dec 29, 2021",
      countDown = new Date(birthday).getTime(),
      x = setInterval(function() {    

        let now = new Date().getTime(),
            distance = countDown - now;

        document.getElementById("days").innerText = Math.floor(distance / (day)),
          document.getElementById("hours").innerText = Math.floor((distance % (day)) / (hour)),
          document.getElementById("minutes").innerText = Math.floor((distance % (hour)) / (minute)),
          document.getElementById("seconds").innerText = Math.floor((distance % (minute)) / second);

        //do something later when date is reached
        if (distance < 0) {
          let headline = document.getElementById("headline"),
              countdown = document.getElementById("countdown"),
              content = document.getElementById("content");

          headline.innerText = "Bestel nu je vuurwerk!";
          countdown.style.display = "none";
          content.style.display = "block";

          clearInterval(x);
        }
        //seconds
      }, 0)
  }());

nav{
  background: #151515;
}
nav:after{
  content: '';
  clear: both;
  display: table;
}
nav .logo{
  float: left;
  line-height: 70px;
  padding-left: 60px;
}
nav ul{
  float: right;
  margin-right: 4px;
  list-style: none;
  position: relative;
}
nav ul li{
  float: left;
  display: inline-block;
  background: #151515;
  margin: 5 5px;
}
nav ul li a{
  color: white;
  line-height: 70px;
  text-decoration: none;
  font-size: 18px;
  padding: 8px 15px;
}
nav ul li a:hover{
  color: white;
  border-radius: 5px;
  box-shadow:  0 0 5px #000000,
               0 0 10px #0a0a0a;
}
nav ul ul li a:hover{
  box-shadow: none;
}
nav ul ul{
  position: absolute;
  top: 90px;
  border-top: 3px solid red;
  opacity: 0;
  visibility: hidden;
  transition: top .3s;
}
nav ul ul ul{
  border-top: none;
}
nav ul li:hover > ul{
  top: 70px;
  opacity: 1;
  visibility: visible;
}
nav ul ul li{
  position: relative;
  margin: 0px -20px;
  width: 175px;
  float: none;
  display: list-item;
  border-bottom: 1px solid rgba(0,0,0,0.3);
  text-align:center;
}
nav ul ul li a{
  line-height: 50px;
}
nav ul ul ul li{
  position: relative;
  top: -60px;
  left: 150px;
}
.show,.icon,input{
  display: none;
}
.fa-plus{
  font-size: 15px;
  margin-left: 40px;
}
@media all and (max-width: 968px) {
  nav ul{
    margin-right: 0px;
    float: left;
  }
  nav .logo{
    padding-left: 30px;
    width: 100%;
  }
  .show + a, ul{
    display: none;
  }
  nav ul li,nav ul ul li{
    display: block;
    width: 100%;
  }
  nav ul li a:hover{
    box-shadow: none;
  }
  .show{
    display: block;
    color: white;
    font-size: 18px;
    padding: 0 15px;
    line-height: 70px;
    cursor: pointer;
  }
  .show:hover{
    background-color:red;
  color: white;
  border-radius:5px;
 
  }
  .icon{
    display: block;
    color: white;
    position: absolute;
    top: 25;
    right: 40px;
    line-height: 70px;
    cursor: pointer;
    font-size: 25px;
  }
  nav ul ul{
    top: 70px;
    border-top: 0px;
    float: none;
    position: static;
    display: none;
    opacity: 1;
    visibility: visible;
  }
  nav ul ul a{
    padding-left: 40px;
  }
  nav ul ul ul a{
    padding-left: 80px;
  }
  nav ul ul ul li{
    position: static;
  }
  [id^=btn]:checked + ul{
    display: block;
  }
  nav ul ul li{
    border-bottom: 0px;
  }
  span.cancel:before{
    content: '\f00d';
  }
}
*{
  margin: 0;
  padding: 0;
  user-select: none;
  box-sizing: border-box;
  font-family: 'Poppins', sans-serif;
}
body{
  background: #1b1b1b;
}
    .container {
      color: yellow;
      margin: 0 auto;
      text-align: center;
    }
.container li {
  display: inline-block;
  font-size: 1.5em;
  list-style-type: none;
  padding: 1em;
  text-transform: uppercase;
}

.container li span {
  display: block;
  font-size: 4.5rem;
}

.message {
  font-size: 4rem;
}

#content {
  display: none;
  padding: 1rem;
}

@media all and (max-width: 768px) {
  h1 {
    font-size: 1.5rem;
  }
  
  li {
    font-size: 1.125rem;
    padding: .75rem;
  }
  
  li span {
    font-size: 3.375rem;
  }
}

  

 <html lang="en" dir="ltr">
   <head>
      <meta charset="utf-8">
      <link rel="stylesheet" href="css/style.css">
      <script src="https://code.jquery.com/jquery-3.5.0.js"></script>
      <script src="https://kit.fontawesome.com/a076d05399.js"></script>
      <script src="js/countdown.js"></script>
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
      <link rel="shortcut icon" type="image/xicon" href="images/logo-klein.png">
      <title>Knalhuis Ochten</title>
   </head>
   <body>
      <nav>
         <div class="logo">
            <div id="myMenu">
            <div class="logo-navbar">
        <nav>
            <a href="index.html"><img src="images/logo-groot.png" height="80" /></a>
        </nav>
        </div>
        </div>
         </div>
    
         <label for="btn" class="icon">
         <span class="fa fa-bars"></span>
         </label>
         <input type="checkbox" id="btn">
         <ul>
            <li><a href="index.html">Home</a></li>
         
            <li>
               <label for="btn-2" class="show">Assortiment</label>
               <a href="#">Assortiment</a>
               <input type="checkbox" id="btn-2">
               <ul>
                  <li><a href="#">Knalvuurwerk</a></li>
                  <li><a href="#">Siervuurwerk</a></li>
                  <li><a href="#">Kindervuurwerk</a></li>
                 
               </ul>
            </li>
            <li><a href="contact.html">Contact</a></li>
         </ul>
      </nav>
    
     <div class="container">
  <h1 id="headline">Dagen tot vuurwerkverkoop:</h1>
  <div id="countdown">
    <ul>
      <li><span id="days"></span>dagen</li>
      <li><span id="hours"></span>uren</li>
      <li><span id="minutes"></span>minuten</li>
      <li><span id="seconds"></span>seconden</li>
    </ul>
  </div>
</div>
      <script>
         $('.icon').click(function(){
           $('span').toggleClass("cancel");
         });
      </script>
   </body>
</html>

Answer 1

原因是因为在你的媒体查询中你有这个：

.show + a, ul{
    display: none;
  }

您正在隐藏所有 ul 元素。删除它，你会看到你的号码。您可能需要保留 .show + a，但 ul 是导致它被隐藏的原因。

.show + a, nav > ul{
    display: none;
  }

这可确保不是每个 ul 都被定位，而只是菜单中的顶级。

编辑 在您提到的导航菜单未折叠的评论中。你可以这样做（或类似的东西，因为我没有所有的代码）：

EDIT 2 您在数字之前看到了 ::before 字体很棒的元素，因为所有跨度都添加了 .cancel 类。下面的 CSS 将解决这个问题。

#countdown li span.cancel::before {
    display: none;
  }

(function() {
  const second = 1000,
    minute = second * 60,
    hour = minute * 60,
    day = hour * 24;

  let birthday = "Dec 29, 2021",
    countDown = new Date(birthday).getTime(),
    x = setInterval(function() {

      let now = new Date().getTime(),
        distance = countDown - now;

      document.getElementById("days").innerText = Math.floor(distance / (day)),
        document.getElementById("hours").innerText = Math.floor((distance % (day)) / (hour)),
        document.getElementById("minutes").innerText = Math.floor((distance % (hour)) / (minute)),
        document.getElementById("seconds").innerText = Math.floor((distance % (minute)) / second);

      //do something later when date is reached
      if (distance < 0) {
        let headline = document.getElementById("headline"),
          countdown = document.getElementById("countdown"),
          content = document.getElementById("content");

        headline.innerText = "Bestel nu je vuurwerk!";
        countdown.style.display = "none";
        content.style.display = "block";

        clearInterval(x);
      }
      //seconds
    }, 0)
}());

nav {
  background: #151515;
}

nav:after {
  content: '';
  clear: both;
  display: table;
}

nav .logo {
  float: left;
  line-height: 70px;
  padding-left: 60px;
}

nav ul {
  float: right;
  margin-right: 4px;
  list-style: none;
  position: relative;
}

nav ul li {
  float: left;
  display: inline-block;
  background: #151515;
  margin: 5 5px;
}

nav ul li a {
  color: white;
  line-height: 70px;
  text-decoration: none;
  font-size: 18px;
  padding: 8px 15px;
}

nav ul li a:hover {
  color: white;
  border-radius: 5px;
  box-shadow: 0 0 5px #000000, 0 0 10px #0a0a0a;
}

nav ul ul li a:hover {
  box-shadow: none;
}

nav ul ul {
  position: absolute;
  top: 90px;
  border-top: 3px solid red;
  opacity: 0;
  visibility: hidden;
  transition: top .3s;
}

nav ul ul ul {
  border-top: none;
}

nav ul li:hover>ul {
  top: 70px;
  opacity: 1;
  visibility: visible;
}

nav ul ul li {
  position: relative;
  margin: 0px -20px;
  width: 175px;
  float: none;
  display: list-item;
  border-bottom: 1px solid rgba(0, 0, 0, 0.3);
  text-align: center;
}

nav ul ul li a {
  line-height: 50px;
}

nav ul ul ul li {
  position: relative;
  top: -60px;
  left: 150px;
}

.show,
.icon,
input {
  display: none;
}

.fa-plus {
  font-size: 15px;
  margin-left: 40px;
}

@media all and (max-width: 968px) {
  nav ul {
    margin-right: 0px;
    float: left;
  }
  nav .logo {
    padding-left: 30px;
    width: 100%;
  }
  nav ul li,
  nav ul ul li {
    display: block;
    width: 100%;
  }
  nav ul li a:hover {
    box-shadow: none;
  }
  .show {
    display: block;
    color: white;
    font-size: 18px;
    padding: 0 15px;
    line-height: 70px;
    cursor: pointer;
  }
  .show+a,
  nav>ul {
    display: none;
  }
  .show:hover {
    background-color: red;
    color: white;
    border-radius: 5px;
  }
  .icon {
    display: block;
    color: white;
    position: absolute;
    top: 25;
    right: 40px;
    line-height: 70px;
    cursor: pointer;
    font-size: 25px;
  }
  nav ul ul {
    top: 70px;
    border-top: 0px;
    float: none;
    position: static;
    display: none;
    opacity: 1;
    visibility: visible;
  }
  nav ul ul a {
    padding-left: 40px;
  }
  nav ul ul ul a {
    padding-left: 80px;
  }
  nav ul ul ul li {
    position: static;
  }
  [id^=btn]:checked+ul {
    display: block;
  }
  nav ul ul li {
    border-bottom: 0px;
  }
  span.cancel:before {
    content: '\f00d';
  }
  #countdown li span.cancel::before {
    display: none;
  }
}

* {
  margin: 0;
  padding: 0;
  user-select: none;
  box-sizing: border-box;
  font-family: 'Poppins', sans-serif;
}

body {
  background: #1b1b1b;
}

.container {
  color: yellow;
  margin: 0 auto;
  text-align: center;
}

.container li {
  display: inline-block;
  font-size: 1.5em;
  list-style-type: none;
  padding: 1em;
  text-transform: uppercase;
}

.container li span {
  display: block;
  font-size: 4.5rem;
}

.message {
  font-size: 4rem;
}

#content {
  display: none;
  padding: 1rem;
}

@media all and (max-width: 768px) {
  h1 {
    font-size: 1.5rem;
  }
  li {
    font-size: 1.125rem;
    padding: .75rem;
  }
  li span {
    font-size: 3.375rem;
  }
}

<html lang="en" dir="ltr">

<head>
  <meta charset="utf-8">
  <link rel="stylesheet" href="css/style.css">
  <script src="https://code.jquery.com/jquery-3.5.0.js"></script>
  <script src="https://kit.fontawesome.com/a076d05399.js"></script>
  <script src="js/countdown.js"></script>
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <link rel="shortcut icon" type="image/xicon" href="images/logo-klein.png">
  <title>Knalhuis Ochten</title>
</head>

<body>
  <nav>
    <div class="logo">
      <div id="myMenu">
        <div class="logo-navbar">
          <nav>
            <a href="index.html"><img src="images/logo-groot.png" height="80" /></a>
          </nav>
        </div>
      </div>
    </div>

    <label for="btn" class="icon">
         <span class="fa fa-bars"></span>
         </label>
    <input type="checkbox" id="btn">
    <ul>
      <li><a href="index.html">Home</a></li>

      <li>
        <label for="btn-2" class="show">Assortiment</label>
        <a href="#">Assortiment</a>
        <input type="checkbox" id="btn-2">
        <ul>
          <li><a href="#">Knalvuurwerk</a></li>
          <li><a href="#">Siervuurwerk</a></li>
          <li><a href="#">Kindervuurwerk</a></li>

        </ul>
      </li>
      <li><a href="contact.html">Contact</a></li>
    </ul>
  </nav>

  <div class="container">
    <h1 id="headline">Dagen tot vuurwerkverkoop:</h1>
    <div id="countdown">
      <ul>
        <li><span id="days"></span>dagen</li>
        <li><span id="hours"></span>uren</li>
        <li><span id="minutes"></span>minuten</li>
        <li><span id="seconds"></span>seconden</li>
      </ul>
    </div>
  </div>
  <script>
    $('.icon').click(function() {
      $('span').toggleClass("cancel");
    });
  </script>
</body>

</html>