当我将警报代码与网站的其余代码组合在一起时，警报代码将不起作用

我分别测试和调试了警报的代码与我网站的其余部分，当它分开时它可以完美运行，但是当我将代码放入我的网站时，警报将不起作用。

测试网站的代码显示一个警报，说"这个网站有假新闻"，但实际网站没有显示任何内容。

我尝试手动调试代码，尝试使用Visual Studio Code的调试器调试代码，我让我的朋友查看代码，没有人可以在代码中找到错误。

以下是网站的一些警报代码：

    <div class="popup">The Earth Is Flat
         <span class="popuptext" id="myPopup"><img src="images/fi.jpg">                                        
         <b>ALERT!</b><br>The Blank Device has scanned this website and found Fake News. The phrase "The Earth is flat." is Fake News.</span>
    </div>

这是它工作的测试网站中的警报代码：

    <div class="popup">The Earth Is Flat
         <span class="popuptext" id="myPopup"><img src="images/fi.jpg"> 
         <b>ALERT!</b><br>The Blank Device has scanned this website and found Fake News. The phrase "The Earth is flat." is Fake News.</span>
    </div>

这是两个网站中的JavaScript代码：

    function myFunction() {
       var popup = document.getElementById("myPopup");
       setTimeout(function(){ popup.classList.toggle("show");}, 3000);
    }

这是 CSS：

  position: relative;
  display: inline-block;
  cursor: pointer;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}
/* The actual popup */
.popup .popuptext {
  visibility: hidden;
  width: 160px;
  background-color: #FF0000;
  color: #fff;
  text-align: center;
  border-radius: 6px;
  padding: 8px 0;
  position: absolute;
  z-index: 1;
  bottom: 125%;
  left: 50%;
  margin-left: -80px;
}
/* Popup arrow */
.popup .popuptext::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  margin-left: -5px;
  border-width: 5px;
  border-style: solid;
  border-color: #FF0000 transparent transparent transparent;
}
/* Toggle this class - hide and show the popup */
.popup .show {
  visibility: visible;
  -webkit-animation: fadeIn 1s;
  animation: fadeIn 1s;
}
/* Add animation (fade in the popup) */
@-webkit-keyframes fadeIn {
  from {opacity: 0;} 
  to {opacity: 1;}
}
@keyframes fadeIn {
  from {opacity: 0;}
  to {opacity:1 ;}
}

测试网站的代码显示一个警报，说"这个网站有假新闻"，但实际网站没有显示任何内容。

你试过这个吗？从逻辑上讲它会起作用

<body onload="myFunction()">
 <div class="popup">The Earth Is Flat
     <span class="popuptext" id="myPopup"><img src="images/fi.jpg">                                        
     <b>ALERT!</b><br>The Blank Device has scanned this website and found Fake News. The phrase "The Earth is flat." is Fake News.</span>
</div>
   <div class="popup">The Earth Is Flat
     <span class="popuptext" id="myPopup"><img src="images/fi.jpg"> 
     <b>ALERT!</b><br>The Blank Device has scanned this website and found Fake News. The phrase "The Earth is flat." is Fake News.</span>
</div>

</body>

您是否忘记在正文标签中输入 js 函数？

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