javascript - 如何自动校正此灯箱中的图像尺寸？

Question

我正在尝试制作 this lightbox在我的网站上工作，但图像没有以其原始尺寸显示，as you can see here (点击“Galeria de fotos”)。我该如何编写以下代码来纠正此问题？

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;
}

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

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

.column {
  float: left;
  width: 33.3%;
}

/* 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;
}

<div role="tabpanel" class="tab-pane" id="messages">
<div class="trip-tab-gallery">
<ul>
  <div class="column">
    <li><img src="images/tab-gallery-img-1.jpg" onclick="openModalhttps://s30.postimg.org/rxspwis5p/tab_gallery_img_1.jpgover-shadow">
  </li>
  </div>
  <div class="column">
    <li><img src="]https://s30.postimg.org/5n4uwjuvh/tab_gallery_img_2.jpg" onclick="openModal();currentSlide(2)" class="hover-shadow">
  </li>
  </div>
  <div class="column">
    <li><img src="https://s30.postimg.org/h0vzlhurx/tab_gallery_img_3.jpg" onclick="openModal();currentSlide(3)" class="hover-shadow">
  </li>
  </div>
  <div class="column">
    <li><img src="https://s30.postimg.org/eku67ncp9/tab_gallery_img_4.jpg" onclick="openModal();currentSlide(4)" class="hover-shadow">
  </li>
  </div>
  </ul>

<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="https://s30.postimg.org/rxspwis5p/tab_gallery_img_1.jpg" style="width:100%">
    </div>

    <div class="mySlides">
      <div class="numbertext">2 / 4</div>
        <img src="]https://s30.postimg.org/5n4uwjuvh/tab_gallery_img_2.jpg" style="width:100%">
    </div>

    <div class="mySlides">
      <div class="numbertext">3 / 4</div>
        <img src="https://s30.postimg.org/h0vzlhurx/tab_gallery_img_3.jpg" style="width:100%">
    </div>

    <div class="mySlides">
      <div class="numbertext">4 / 4</div>
        <img src="https://s30.postimg.org/eku67ncp9/tab_gallery_img_4.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" src="https://s30.postimg.org/rxspwis5p/tab_gallery_img_1.jpg" onclick="currentSlide(1)" alt="Nature">
    </div>

    <div class="column">
      <img class="demo" src="]https://s30.postimg.org/5n4uwjuvh/tab_gallery_img_2.jpg" onclick="currentSlide(2)" alt="Trolltunga">
    </div>

    <div class="column">
      <img class="demo" src="https://s30.postimg.org/h0vzlhurx/tab_gallery_img_3.jpg" onclick="currentSlide(3)" alt="Mountains">
    </div>

    <div class="column">
      <img class="demo" src="https://s30.postimg.org/eku67ncp9/tab_gallery_img_4.jpg" onclick="currentSlide(4)" alt="Lights">
    </div>
  </div>
</div>
</div>
</div>

Answer 1

我看到在所有图像上，宽度都是 100%:

<img src="https://s30.postimg.org/5n4uwjuvh/tab_gallery_img_2.jpg" style="width:100%">

将宽度设置为 100% 会强制图像扩展到容器的大小。将其更改为 ma​​x-width 应该可以解决该问题，同时确保图像不会超出容器。

<img src="https://s30.postimg.org/5n4uwjuvh/tab_gallery_img_2.jpg" style="max-width:100%">

之后，您可以考虑将图像居中并使其在较小时看起来不错。

旁注:我注意到一些图片网址上有一个 [，我猜这是一个拼写错误？

更新:要使图像与中心对齐并“移除”背景:

添加以下 CSS:

.mySlides{
    background: black;
    text-align: center;
}

这会将背景设置为黑色，这样看起来就不会很差，并将图片居中对齐。