Question

我相对较新，但是我找到了一个程序，用于弹出一个使用图像的模态/对话框。

    <!DOCTYPE html>
<html>
<head>
    <style type="text/css">
    #myImg {
        border-radius: 5px;
        cursor: pointer;
        transition: 0.3s;
    }
    #myImg:hover {opacity: 0.7;}

    .modal {
        display: none;
        position: fixed;
        z-index: 1;
        padding-top: 100px;
        left: 0;
        right: 0;
        width: 100%;
        height: 100%;
        overflow: auto;
        background-color: rgba (0,0,0,0.7);
    }
    .modal-content {
        margin: auto;
        display: block;
        width 80%;
        max-width: 80%;
    }
    #caption {
        margin: auto;
        display: block;
        width: 80%;
        max-width: 700px;
        text-align: center;
        color: #CCC;
        padding: 10px 0;
        height: 150px;
    }
    .modal-content, #caption {
        -webkit-animation-name: zoom;
        -webkit-animation-duration: 0.6s;
        animation-name: zoom;
        animation-duration: 0.6s;
    }
    @-webkit-keyframes zoom {
        from {-webkit-transform:scale(0)}
        to {-webkit-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;
    }

    </style>
</head>
<body>
<img src='https://cdn.sstatic.net/Sites/stackoverflow/img/apple-touch-icon@2.png?v=73d79a89bded' id="myImg" alt="Floor 1" width="300" height="200">
<div id="myModal" class="modal">
    <span class="close" onclick="document.getElementById('myModal').style.display='none'">&times;</span>
    <img class="modal-content" id="img01" >
    <div id="caption"></div>
</div>

<script>
    var modal = document.getElementById('myModal');
    var img = document.getElementById('myImg');
    var modalImg = document.getElementById("img01");
    var captionText = document.getElementById("caption");

    img.onclick = function() {
        modal.style.display = "block";
        modalImg.src = this.src;
        captionText.innerHTML = this.alt;
    }
    var span = document.getElementsByClassName("close")[0];
    span.onclick = function () {
        modal.style.display = "none";
    }
</script>

这是它的代码，它完美无缺。我关心的是特定的片段：

    img.onclick = function() {
        modal.style.display = "block";
        modalImg.src = this.src;
        captionText.innerHTML = this.alt;
    }

我试图在嵌套在span标签内的图像上使用此onclick功能。有没有办法在上面粘贴的函数中使用：nth-child选择器？理想情况下，程序将在单击跨度时执行，并且嵌套图像将被执行。＆＃39; SRC＆＃39;将在这里分配：

     <img class="modal-content" id="img01" >

Answer 1

目前还不清楚你的意思是：nth-child选择器，但通常的过程就是你首先得到你想要复制的元素源：

var source = document.getElementById('image').src

然后你将src分配给另一个元素，如：

document.getElementById('image2').src = source;

现在关于如何选择第二个元素（要为其分配新src的元素），它取决于它的确切位置。你能澄清一下吗？

如何通过JS将元素的第n个子元素的src属性赋值给另一个元素

1 个答案: