Question

我似乎无法让这个工作。我正在尝试将javascript书签转换为javascript onclick函数，以放大页面中的图像。

小书签如下......

javascript:(function(){ function zoomImage(image, amt) { if(image.initialHeight == null) { /* avoid accumulating integer-rounding error */ image.initialHeight=image.height; image.initialWidth=image.width; image.scalingFactor=1; } image.scalingFactor*=amt; image.width=image.scalingFactor*image.initialWidth; image.height=image.scalingFactor*image.initialHeight; } var i,L=document.images.length; for (i=0;i<L;++i) zoomImage(document.images[i], 2); if (!L) alert("This page contains no images."); })();

但这是我到目前为止所做的，但是工作不正常......

JS：

(function vbZoom() {
    function zoomImage(image, amt) {
        if (image.initialHeight == null) {
            image.initialHeight = image.height;
            image.initialWidth = image.width;
            image.scalingFactor = 1;
        }
        image.scalingFactor *= amt;
        image.width = image.scalingFactor * image.initialWidth;
        image.height = image.scalingFactor * image.initialHeight;
    }
    var i, L = document.images.length;
    for (i = 0; i < L; ++i) zoomImage(document.images[i], 2);
    if (!L) alert("This page contains no images.");
})();

链接:(来自图片）

<img id="vZoomIn" onclick="vbZoom()">

请帮助，任何人。

编辑：我应该注意......它部分有效。它目前所做的是在加载时使页面上的图像大两倍，但按钮什么都不做。

Answer 1

将这个功能包装在这些括号中意味着它会被立即调用而不能在括号外使用，称为Immediately-invoked function expression，将其更改为

function vbZoom() {
    function zoomImage(image, amt) {
        if (image.initialHeight == null) {
            image.initialHeight = image.height;
            image.initialWidth = image.width;
            image.scalingFactor = 1;
        }
        image.scalingFactor *= amt;
        image.width = image.scalingFactor * image.initialWidth;
        image.height = image.scalingFactor * image.initialHeight;
    }
    var i, L = document.images.length;
    for (i = 0; i < L; ++i) zoomImage(document.images[i], 2);
    if (!L) alert("This page contains no images.");
}

实际上在代码中可能会有很多变化，但这应该至少有效，并且可以在页面的其余部分使用，而不是自动调用。

Answer 2

你可以使用fancybox

使用Jquery然后使用fancybox css & js
使用下面给出的精美框 html，它有助于根据需要缩放图像。

<script src="https://cdn.jsdelivr.net/npm/jquery@3.5.1/dist/jquery.min.js"></script>

   <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/fancybox/3.5.7/jquery.fancybox.css">

   <a class="hidden-md hidden-lg" href="https://bdtender.com/tenderimage/Feb04/Feb04_BT040221-2A.jpg" data-fancybox="images" data-caption="My caption">
    <img src="https://bdtender.com/tenderimage/Feb04/Feb04_BT040221-2A.jpg" style="width:100%; height:auto;" alt="" />
   </a>

  <script src="https://cdnjs.cloudflare.com/ajax/libs/fancybox/3.5.7/jquery.fancybox.min.js"> 
 </script>

Answer 3

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;
    modalImg.alt = this.alt;
 
}

modal.onclick = function() {
    img01.className += " out";
    setTimeout(function() {
       modal.style.display = "none";
       img01.className = "modal-content";
     }, 400);
    
 }

#myImg {
    border-radius: 5px;
    cursor: pointer;
    transition: 0.3s;
    display: block;
    margin-left: auto;
    margin-right: auto
}

#myImg:hover {opacity: 0.7;}

/* The Modal (background) */
.modal {
    display: none; /* Hidden by default */
    position: fixed; /* Stay in place */
    z-index: 1; /* Sit on top */
    padding-top: 100px; /* Location of the box */
    left: 0;
    top: 0;
    width: 100%; /* Full width */
    height: 100%; /* Full height */
    overflow: auto; /* Enable scroll if needed */
    background-color: rgb(0,0,0); /* Fallback color */
    background-color: rgba(0,0,0,0.9); /* Black w/ opacity */
}

/* Modal Content (image) */
.modal-content {
    margin: auto;
    display: block;
    width: 75%;
    //max-width: 75%;
}

/* Caption of Modal Image */
#caption {
    margin: auto;
    display: block;
    width: 80%;
    max-width: 700px;
    text-align: center;
    color: #ccc;
    padding: 10px 0;
    height: 150px;
}

/* Add Animation */
.modal-content, #caption {
    -webkit-animation-name: zoom;
    -webkit-animation-duration: 0.6s;
    animation-name: zoom;
    animation-duration: 0.6s;
}

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

@-webkit-keyframes zoom {
    from {-webkit-transform:scale(1)}
    to {-webkit-transform:scale(2)}
}

@keyframes zoom {
    from {transform:scale(0.4)}
    to {transform:scale(1)}
}

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

/* The Close Button */
.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%;
    }
}

<img id="myImg" src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/3/journey_start_thumbnail.jpg" alt="Trolltunga, Norway" width="500" height="300">

<!-- The Modal -->
<div id="myModal" class="modal">
  <img class="modal-content" id="img01">
</div>

javascript来缩放图像

3 个答案: