javascript - [variable].onclick = function () 没有执行，控制台没有错误

Question

我是 javascript 的新手，这可能非常简单。我正在尝试创建代码，当我单击图像时，同一图像将以模式启动。这适用于查看完整尺寸图像的作品集。我的 javascript 控制台没有错误，但是当我单击图像时没有任何反应。

JavaScript:

var modal = document.getElementById("myModal");
var srcImg = document.getElementsByClassName("showFull");
var modalImg = document.getElementById("img01");
var captionText = document.getElementById("caption");
srcImg.onclick = function () {
    modal.style.display = "block";
    modalImg.src = this.src;
    modalImg.alt = this.alt;
    captionText.innerHTML = this.alt;
}

  var exit = document.getElementsByClassName("close")[0];

  exit.onclick = function () {
    modal.style.display = "none";
  };

html:

<div class="mySlides fade">
                <img class="slide showFull" src="images/mikesHarder.jpg alt="caption 123" style="width:100%" />
</div>

<div class="mySlides fade">
                <img class="slide showFull" src="images/Going-Green.jpg" alt="caption 123" style="width:100%" />
</div>

<div id="myModal" class="modal">

                      <!-- The Close Button -->
                      <span class="close">&times;</span>

                      <!-- Modal Content -->
                      <img id="img01" class="modal-content"/>
                      <div id="caption"></div>
</div>

CSS:

.showFull {
    border-radius: 5px;
    cursor: pointer;
    transition: 0.3s;
}

.showFull:hover {opacity: 0.9;}

.modal {
    display: none;
    position: fixed; 
    z-index: 1; 
    padding-top: 100px; 
    left: 0;
    top: 0;
    width: 100%; 
    height: 100%; 
    overflow: auto; 
    background-color: rgb(0,0,0);
    background-color: rgba(0,0,0,0.8);
}

.modal-content {
    margin: auto;
    display: block;
    width: 80%;
    max-width: 480px;
}

.modal-content { 
    animation-name: zoom;
    animation-duration: 0.6s;
}

@keyframes zoom {
    from {transform:scale(0)} 
    to {transform:scale(1)}
}

.close {
    position: absolute;
    top: 15px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    transition: 0.3s;
}

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

@media only screen and (max-width: 700px){
    .modal-content {
        width: 100%;
    }
}

Answer 1

我认为 1 个问题是 srcImg 是一个 html 元素数组而不是单个元素，因此当您编写 srcImg.onclick 时它不起作用，因为您只能对表示 html 元素的 DOM 对象使用 onclick。