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关闭图片外的弹出窗口（工作中的新手）

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我是脚本的新手。我下面有这段代码，需要知道如何通过单击图像外部的任意位置而不是仅单击“ X”来关闭灯箱。
我也包括.css，以防您需要。 我尝试了其他一些在网上找到的代码，但无法弄清楚如何将我发现的内容“翻译”为特定的代码。 我非常感谢您的帮助。

谢谢

<!DOCTYPE html>
<html>
<meta name="viewport" content="width=device-width,initial-scale=1">
<style>
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(0,0.8);
}

/* 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(0,0.2),0 6px 20px 0 rgba(0,0.19);
}
</style>
<body>

<h2 style="text-align:center">Lightbox</h2>

<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>

<script>
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;
}
</script>

</body>
</html>
moyear 回答：关闭图片外的弹出窗口（工作中的新手）
暂时没有好的解决方案，如果你有好的解决方案，请发邮件至：iooj@foxmail.com
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