javascript - 两个 css 代码相互重叠，看不到其中一个

Question

我想创建一个网页，在那里我可以看到我的视频和一些图片。我从 w3schools 获得了一些图库页面的免费示例，并从其他地方获得了一些视频嵌入代码。这些代码可以独立运行，但当我将它们放在一起时，我无法弄清楚问题出在哪里。

在样式标签中有一个

.modal {
  display: none;
  position: fixed;
  z-index: 1;
  padding-top: 100px;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: black;
}

我认为问题就出在这里。

这是我的代码

 /* video */
$(document).ready(function() {
  $('#videos a').each(function() {
    var data = $(this).attr('data');
    $(this).append('<img src="http://img.youtube.com/vi/'+data+'/maxresdefault.jpg" />');
  });

  $('#videos a').click(function() {
    var data = $(this).attr('data');
    $('#loader').append('<iframe src="https://www.youtube.com/embed/'+data+'" frameborder="0" allowfullscreen></iframe>');
    $('#overlay').fadeIn(250);
  });

  $('#close').click(function() {
    $('#overlay').fadeOut(250,function() {
       $('#loader').html('');
    });
  });
});

/* VIDEÓ */
function openModal() {
  document.getElementById("myModal").style.display = "block";
}

function closeModal() {
  document.getElementById("myModal").style.display = "none";
}

var slideIndex = 1;
showSlides(slideIndex);

function plusSlides(n) {
  showSlides(slideIndex += n);
}

function currentSlide(n) {
  showSlides(slideIndex = n);
}

function showSlides(n) {
  var i;
  var slides = document.getElementsByClassName("mySlides");
  var dots = document.getElementsByClassName("demo");
  var captionText = document.getElementById("caption");
  if (n > slides.length) {slideIndex = 1}
  if (n < 1) {slideIndex = slides.length}
  for (i = 0; i < slides.length; i++) {
    slides[i].style.display = "none";
  }
  for (i = 0; i < dots.length; i++) {
    dots[i].className = dots[i].className.replace(" active", "");
  }
  slides[slideIndex-1].style.display = "block";
  dots[slideIndex-1].className += " active";
  captionText.innerHTML = dots[slideIndex-1].alt;
}

#videos a {
   display: block;
   width: 25%;
   margin-bottom: 20px;
   box-sizing: border-box;
   padding: 0 10px;
   float: left;
   cursor: pointer;
   text-decoration: none;
   outline: 0;
}

#videos a:hover {
   opacity: 0.7;
}

#videos a img {
   width: 100%;
   height: auto;
}

#overlay {
   background: rgba(0,0,0,0.8);
   position:fixed;
   top: 0;
   right: 0;
   left:0;
   bottom: 0;
   width: 100%;
   height: 100%;
   z-index: 99999;
   display: none;
}

#overlay .modal {
   background: #fff;
   border-radius: 5px;
   width: 90%;
   margin: 100px auto;
   max-width: 800px;
   min-height: 100px;
   position: relative;
   padding: 30px 20px 15px;
}

#overlay .modal #close {
   position: absolute;
   top: 5px;
   right: 5px;
   cursor: pointer;
}

#overlay iframe {
   width: 100%;
}
/* VIDEÓ VÉGE */

body {
  font-family: Verdana, sans-serif;
  margin: 0;
}

* {
  box-sizing: border-box;
}

.row > .column {
  padding: 0 8px;
}

.row:after {
  content: "";
  display: table;
  clear: both;
}

.column {
  float: left;
  width: 25%;
}

/* The Modal (background) */
.modal {
  display: none;
  position: fixed;
  z-index: 1;
  padding-top: 100px;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: black;
}

/* Modal Content */
.modal-content {
  position: relative;
  background-color: #fefefe;
  margin: auto;
  padding: 0;
  width: 90%;
  max-width: 1200px;
}

/* The Close Button */
.close {
  color: white;
  position: absolute;
  top: 10px;
  right: 25px;
  font-size: 35px;
  font-weight: bold;
}

.close:hover,
.close:focus {
  color: #999;
  text-decoration: none;
  cursor: pointer;
}

.mySlides {
  display: none;
}

.cursor {
  cursor: pointer;
}

/* Next & previous buttons */
.prev,
.next {
  cursor: pointer;
  position: absolute;
  top: 50%;
  width: auto;
  padding: 16px;
  margin-top: -50px;
  color: white;
  font-weight: bold;
  font-size: 20px;
  transition: 0.6s ease;
  border-radius: 0 3px 3px 0;
  user-select: none;
  -webkit-user-select: none;
}

/* Position the "next button" to the right */
.next {
  right: 0;
  border-radius: 3px 0 0 3px;
}

/* On hover, add a black background color with a little bit see-through */
.prev:hover,
.next:hover {
  background-color: rgba(0, 0, 0, 0.8);
}

/* Number text (1/3 etc) */
.numbertext {
  color: #f2f2f2;
  font-size: 12px;
  padding: 8px 12px;
  position: absolute;
  top: 0;
}

img {
  margin-bottom: -4px;
}

.caption-container {
  text-align: center;
  background-color: black;
  padding: 2px 16px;
  color: white;
}

.demo {
  opacity: 0.6;
}

.active,
.demo:hover {
  opacity: 1;
}

img.hover-shadow {
  transition: 0.3s;
}

.hover-shadow:hover {
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
}

<link href='https://fonts.googleapis.com/css?family=Roboto+Mono:400,300' rel='stylesheet' type='text/css'>
<script src="https://code.jquery.com/jquery-3.4.1.js"></script>

              
<h1 style="text-align:center">Lightbox</h1>

<div class="row">
  <div class="column">
    <img src="img_nature.jpg" style="width:100%" onclick="openModal();currentSlide(1)" class="hover-shadow cursor">
  </div>
  <div class="column">
    <img src="img_snow.jpg" style="width:100%" onclick="openModal();currentSlide(2)" class="hover-shadow cursor">
  </div>
  <div class="column">
    <img src="img_mountains.jpg" style="width:100%" onclick="openModal();currentSlide(3)" class="hover-shadow cursor">
  </div>
  <div class="column">
    <img src="img_lights.jpg" style="width:100%" onclick="openModal();currentSlide(4)" class="hover-shadow cursor">
  </div>
</div>

<div id="myModal" class="modal">
  <span class="close cursor" onclick="closeModal()">&times;</span>
  <div class="modal-content">

    <div class="mySlides">
      <div class="numbertext">1 / 4</div>
      <img src="img_nature_wide.jpg" style="width:100%">
    </div>

    <div class="mySlides">
      <div class="numbertext">2 / 4</div>
      <img src="img_snow_wide.jpg" style="width:100%">
    </div>

    <div class="mySlides">
      <div class="numbertext">3 / 4</div>
      <img src="img_mountains_wide.jpg" style="width:100%">
    </div>

    <div class="mySlides">
      <div class="numbertext">4 / 4</div>
      <img src="img_lights_wide.jpg" style="width:100%">
    </div>

    <a class="prev" onclick="plusSlides(-1)">&#10094;</a>
    <a class="next" onclick="plusSlides(1)">&#10095;</a>

    <div class="caption-container">
      <p id="caption"></p>
    </div>


    <div class="column">
      <img class="demo cursor" src="img_nature_wide.jpg" style="width:100%" onclick="currentSlide(1)" alt="Nature and sunrise">
    </div>
    <div class="column">
      <img class="demo cursor" src="img_snow_wide.jpg" style="width:100%" onclick="currentSlide(2)" alt="Snow">
    </div>
    <div class="column">
      <img class="demo cursor" src="img_mountains_wide.jpg" style="width:100%" onclick="currentSlide(3)" alt="Mountains and fjords">
    </div>
    <div class="column">
      <img class="demo cursor" src="img_lights_wide.jpg" style="width:100%" onclick="currentSlide(4)" alt="Northern Lights">
    </div>
  </div>
</div>
<br>
<h2 style="text-align:center">Videos</h2>
 <div id="videos">
    <a data="uT6YOI6JcRs"></a>
    <a data="B9FzVhw8_bY"></a>
    <a data="d0K436vUM4w"></a>
    <a data="PhbWIFDqQfk"></a>
 </div>

 <div id="overlay">
    <div class="modal">
       <div id="close">X</div>
       <div id="loader"></div>
    </div>
 </div>

       
    

我没有收到错误。我希望能够点击与视频分开的图像，反之亦然。如果删除从 VIDEÓ 到 VIDEÓVÉGE 的 css，您可以看到图片库正在运行。如果您从 VIDEÓ VÉGE 删除样式底部的 css，您可以看到视频页面也能正常工作。

我尝试修改两个 css 代码的 z-indexes。

Answer 1

好的，问题是我在 css 中使用了两个相同的 .modal。我在 css 和 html 中将视频的 css modal 重命名为 modale，一切正常。谢谢大家!