PhotoSwipe中文API(一)

入门

您应知道之前先做起事情：

1. PhotoSwipe不是一个简单的jQuery插件，至少基本的JavaScript知识才能安装。

2. PhotoSwipe需要预定义的图像尺寸（更多关于这一点）。

3. 如果您在非回应网站上使用PhotoSwipe - 控制将在移动进行换算（整页缩放）。所以你需要实现自定义控件（在右上角例如单个大关闭按钮）。

4. 文档中所有的代码是纯香草JS和支持IE8及以上。如果您的网站或应用程序使用了一些JavaScript框架（像jQuery或MooTools的），或者你并不需要支持旧的浏览器 - 随意简化代码。

5. 避免对移动服务的大图像（大于2000x1500px），因为它们会极大地降低动画性能，并可能导致崩溃（尤其是iOS上的Safari浏览器）。可能的解决方案：一个单独的网页上投放响应图像，或者打开的图像，或者（在常见问题解答更多）使用支持平铺图像（如传单）库。

初始化

第1步：包括JS和CSS文件

您可以在GitHub的信息库DIST/文件夹中找到它们。萨斯和未编译的JS文件夹中的src /。我建议使用无礼的话，如果你打算修改现有的样式，有代码的结构和评述。https://github.com/dimsemenov/PhotoSwipe

 <!-- Core CSS file -->
 <link rel="stylesheet" href="path/to/photoswipe.css"> 

 <!-- Skin CSS file (styling of UI - buttons, caption, etc.)
      In the folder of skin CSS file there are also:
      - .png and .svg icons sprite,
      - preloader.gif (for browsers that do not support CSS animations) -->
 <link rel="stylesheet" href="path/to/default-skin/default-skin.css"> 

 <!-- Core JS file -->
 <script src="path/to/photoswipe.min.js"></script> 

 <!-- UI JS file -->
 <script src="path/to/photoswipe-ui-default.min.js"></script> 

不要紧，如何以及在哪里将包括JS和CSS文件。只有当你调用新PhotoSwipe代码被执行（）。可以随意推迟文件加载，如果你不需要PhotoSwipe被初步打开。

PhotoSwipe还支持AMD装载机（如RequireJS）和CommonJS的，使用起来就像这样：

 require([
         'path/to/photoswipe.js',
         'path/to/photoswipe-ui-default.js'
     ], function( PhotoSwipe, PhotoSwipeUI_Default ) {

     //      var gallery = new PhotoSwipe( someElement, PhotoSwipeUI_Default ...
     //      gallery.init()
     //      ...

 });

而且，您可以通过鲍尔安装（安装鲍尔photoswipe），或NPM（NPM安装photoswipe）。

第2步：PhotoSwipe（.pswp）元素添加到DOM

您可以通过JS动态添加HTML代码（直接在初始化之前），或者有它的页面开始（喜欢它的演示页面上完成）。该代码可以在任何地方附加，但理想的结束</ body>之前。 （你用相同的UI类只要）你可以重复使用它在多个画廊。

 <!-- Root element of PhotoSwipe. Must have class pswp. -->
 <div class="pswp" tabindex="-1" role="dialog" aria-hidden="true">

     <!-- Background of PhotoSwipe.
          It's a separate element as animating opacity is faster than rgba(). -->
     <div class="pswp__bg"></div>

     <!-- Slides wrapper with overflow:hidden. -->
     <div class="pswp__scroll-wrap">

         <!-- Container that holds slides.
             PhotoSwipe keeps only 3 of them in the DOM to save memory.
             Don't modify these 3 pswp__item elements, data is added later on. -->
         <div class="pswp__container">
             <div class="pswp__item"></div>
             <div class="pswp__item"></div>
             <div class="pswp__item"></div>
         </div>

         <!-- Default (PhotoSwipeUI_Default) interface on top of sliding area. Can be changed. -->
         <div class="pswp__ui pswp__ui--hidden">

             <div class="pswp__top-bar">

                 <!--  Controls are self-explanatory. Order can be changed. -->

                 <div class="pswp__counter"></div>

                 <button class="pswp__button pswp__button--close" title="Close (Esc)"></button>

                 <button class="pswp__button pswp__button--share" title="Share"></button>

                 <button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button>

                 <button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button>

                 <!-- Preloader demo http://codepen.io/dimsemenov/pen/yyBWoR -->
                 <!-- element will get class pswp__preloader--active when preloader is running -->
                 <div class="pswp__preloader">
                     <div class="pswp__preloader__icn">
                       <div class="pswp__preloader__cut">
                         <div class="pswp__preloader__donut"></div>
                       </div>
                     </div>
                 </div>
             </div>

             <div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap">
                 <div class="pswp__share-tooltip"></div>
             </div>

             <button class="pswp__button pswp__button--arrow--left" title="Previous (arrow left)">
             </button>

             <button class="pswp__button pswp__button--arrow--right" title="Next (arrow right)">
             </button>

             <div class="pswp__caption">
                 <div class="pswp__caption__center"></div>
             </div>

         </div>

     </div>

 </div>

pswp__bg，pswp__scroll换行，pswp__container和pswp__item元素的顺序不应改变。

你可能会问，为什么PhotoSwipe不通过JS自动添加该代码，原因很简单 - 只是为了节省文件大小的情况下，如果你需要的布局做一些修改。

步骤3：初始化

执行PhotoSwipe构造函数。它接受4个参数：

1. 从步骤2（它必须被添加到DOM）.pswp元件。

2. PhotoSwipe UI类。如果包括了默认photoswipe-UI-default.js，类将是PhotoSwipeUI_Default。可以是假的。

3. 与对象（幻灯片）阵列。

4. options

 var pswpElement = document.querySelectorAll('.pswp')[0];

 // build items array
 var items = [
     {
         src: 'https://placekitten.com/600/400',
         w: 600,
         h: 400
     },
     {
         src: 'https://placekitten.com/1200/900',
         w: 1200,
         h: 900
     }
 ];

 // define options (if needed)
 var options = {
     // optionName: 'option value'
     // for example:
     index: 0 // start at first slide
 };

 // Initializes and opens PhotoSwipe
 var gallery = new PhotoSwipe( pswpElement, PhotoSwipeUI_Default, items, options);
 gallery.init();

在最后你应该得到的东西是这样的：

html:

 <button id="btn">Open PhotoSwipe</button>

 <!-- Root element of PhotoSwipe. Must have class pswp. -->
 <div class="pswp" tabindex="-1" role="dialog" aria-hidden="true">

     <!-- Background of PhotoSwipe.
          It's a separate element, as animating opacity is faster than rgba(). -->
     <div class="pswp__bg"></div>

     <!-- Slides wrapper with overflow:hidden. -->
     <div class="pswp__scroll-wrap">

         <!-- Container that holds slides. PhotoSwipe keeps only 3 slides in DOM to save memory. -->
         <div class="pswp__container">
             <!-- don't modify these 3 pswp__item elements, data is added later on -->
             <div class="pswp__item"></div>
             <div class="pswp__item"></div>
             <div class="pswp__item"></div>
         </div>

         <!-- Default (PhotoSwipeUI_Default) interface on top of sliding area. Can be changed. -->
         <div class="pswp__ui pswp__ui--hidden">

             <div class="pswp__top-bar">

                 <!--  Controls are self-explanatory. Order can be changed. -->

                 <div class="pswp__counter"></div>

                 <button class="pswp__button pswp__button--close" title="Close (Esc)"></button>

                 <button class="pswp__button pswp__button--share" title="Share"></button>

                 <button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button>

                 <button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button>

                 <!-- Preloader demo http://codepen.io/dimsemenov/pen/yyBWoR -->
                 <!-- element will get class pswp__preloader--active when preloader is running -->
                 <div class="pswp__preloader">
                     <div class="pswp__preloader__icn">
                       <div class="pswp__preloader__cut">
                         <div class="pswp__preloader__donut"></div>
                       </div>
                     </div>
                 </div>
             </div>

             <div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap">
                 <div class="pswp__share-tooltip"></div>
             </div>

             <button class="pswp__button pswp__button--arrow--left" title="Previous (arrow left)">
             </button>

             <button class="pswp__button pswp__button--arrow--right" title="Next (arrow right)">
             </button>

             <div class="pswp__caption">
                 <div class="pswp__caption__center"></div>
             </div>

           </div>

         </div>

 </div>

js :

var openPhotoSwipe = function() {
    var pswpElement = document.querySelectorAll('.pswp')[0];

    // build items array
    var items = [
        {
            src: 'https://farm2.staticflickr.com/1043/5186867718_06b2e9e551_b.jpg',
            w: 964,
            h: 1024
        },
        {
            src: 'https://farm7.staticflickr.com/6175/6176698785_7dee72237e_b.jpg',
            w: 1024,
            h: 683
        }
    ];

    // define options (if needed)
    var options = {
             // history & focus options are disabled on CodePen
        history: false,
        focus: false,

        showAnimationDuration: 0,
        hideAnimationDuration: 0

    };

    var gallery = new PhotoSwipe( pswpElement, PhotoSwipeUI_Default, items, options);
    gallery.init();
};

openPhotoSwipe();

document.getElementById('btn').onclick = openPhotoSwipe;

结果：

创建幻灯片对象的数组

数组应包含有关幻灯片数据中的每个对象，也可以是你希望在PhotoSwipe显示任何东西 - 路径图像，标题字符串，股数，评论等。

默认情况下PhotoSwipe只使用了5个属性：SRC（路径图），W（图像宽度），H（图像高度），MSRC（路径的小图像占位符，大的图像会在上面装），HTML（自定义HTML，更 关于它）。

在导航，PhotoSwipe增加自己的属性到这个对象（如MINZOOM或加载）。

 var slides = [

     // slide 1
     {

         src: 'path/to/image1.jpg', // path to image
         w: 1024, // image width
         h: 768, // image height

         msrc: 'path/to/small-image.jpg', // small image placeholder,
                         // main (large) image loads on top of it,
                         // if you skip this parameter - grey rectangle will be displayed,
                         // try to define this property only when small image was loaded before

         title: 'Image Caption'  // used by Default PhotoSwipe UI
                                 // if you skip it, there won't be any caption

         // You may add more properties here and use them.
         // For example, demo gallery uses "author" property, which is used in the caption.
         // author: 'John Doe'

     },

     // slide 2
     {
         src: 'path/to/image2.jpg',
         w: 600,
         h: 600

         // etc.
     }

     // etc.

 ];

您可以动态地定义幻灯片对象的属性PhotoSwipe读取它们直接之前，使用gettingData事件（在文档的API部分的更多信息）。例如，该技术可用于为不同的屏幕尺寸不同的图像。

如何从一个链接列表建立幻灯片的数组

让我们假设你有一个看起来像这样（约画廊的标记更多信息）的链接/缩略图列表：

 <div class="my-gallery" itemscope itemtype="http://schema.org/ImageGallery">

     <figure itemprop="associatedMedia" itemscope itemtype="http://schema.org/ImageObject">
         <a href="large-image.jpg" itemprop="contentUrl" data-size="600x400">
             <img src="small-image.jpg" itemprop="thumbnail" alt="Image description" />
         </a>
         <figcaption itemprop="caption description">Image caption</figcaption>
     </figure>

     <figure itemprop="associatedMedia" itemscope itemtype="http://schema.org/ImageObject">
         <a href="large-image.jpg" itemprop="contentUrl" data-size="600x400">
             <img src="small-image.jpg" itemprop="thumbnail" alt="Image description" />
         </a>
         <figcaption itemprop="caption description">Image caption</figcaption>
     </figure>

 </div>

...你要点击缩略图与大型图像打开PhotoSwipe（喜欢它的演示页上完成）。所有你需要做的是：

1. 绑定click事件链接/缩略图。

2. 用户点击缩略图后，找到它的索引。

3. 创建DOM元素幻灯片对象的数组 - 通过各环节循环和检索href属性（大图像URL），数据大小属性（其大小），缩略图的SRC和字幕的内容。

PhotoSwipe并不真正关心你将如何做到这一点。如果你使用像jQuery或MooTools的框架，或者如果你不需要支持IE8，代码可以大大简化。

这里是纯香草JS实现与IE8的支持：

 var initPhotoSwipeFromDOM = function(gallerySelector) {

     // parse slide data (url, title, size ...) from DOM elements
     // (children of gallerySelector)
     var parseThumbnailElements = function(el) {
         var thumbElements = el.childNodes,
             numNodes = thumbElements.length,
             items = [],
             figureEl,
             linkEl,
             size,
             item;

         for(var i = 0; i < numNodes; i++) {

             figureEl = thumbElements[i]; // <figure> element

             // include only element nodes
             if(figureEl.nodeType !== 1) {
                 continue;
             }

             linkEl = figureEl.children[0]; // <a> element

             size = linkEl.getAttribute('data-size').split('x');

             // create slide object
             item = {
                 src: linkEl.getAttribute('href'),
                 w: parseInt(size[0], 10),
                 h: parseInt(size[1], 10)
             };

             if(figureEl.children.length > 1) {
                 // <figcaption> content
                 item.title = figureEl.children[1].innerHTML;
             }

             if(linkEl.children.length > 0) {
                 // <img> thumbnail element, retrieving thumbnail url
                 item.msrc = linkEl.children[0].getAttribute('src');
             } 

             item.el = figureEl; // save link to element for getThumbBoundsFn
             items.push(item);
         }

         return items;
     };

     // find nearest parent element
     var closest = function closest(el, fn) {
         return el && ( fn(el) ? el : closest(el.parentNode, fn) );
     };

     // triggers when user clicks on thumbnail
     var onThumbnailsClick = function(e) {
         e = e || window.event;
         e.preventDefault ? e.preventDefault() : e.returnValue = false;

         var eTarget = e.target || e.srcElement;

         // find root element of slide
         var clickedListItem = closest(eTarget, function(el) {
             return (el.tagName && el.tagName.toUpperCase() === 'FIGURE');
         });

         if(!clickedListItem) {
             return;
         }

         // find index of clicked item by looping through all child nodes
         // alternatively, you may define index via data- attribute
         var clickedGallery = clickedListItem.parentNode,
             childNodes = clickedListItem.parentNode.childNodes,
             numChildNodes = childNodes.length,
             nodeIndex = 0,
             index;

         for (var i = 0; i < numChildNodes; i++) {
             if(childNodes[i].nodeType !== 1) {
                 continue;
             }

             if(childNodes[i] === clickedListItem) {
                 index = nodeIndex;
                 break;
             }
             nodeIndex++;
         }

         if(index >= 0) {
             // open PhotoSwipe if valid index found
             openPhotoSwipe( index, clickedGallery );
         }
         return false;
     };

     // parse picture index and gallery index from URL (#&pid=1&gid=2)
     var photoswipeParseHash = function() {
         var hash = window.location.hash.substring(1),
         params = {};

         if(hash.length < 5) {
             return params;
         }

         var vars = hash.split('&');
         for (var i = 0; i < vars.length; i++) {
             if(!vars[i]) {
                 continue;
             }
             var pair = vars[i].split('=');
             if(pair.length < 2) {
                 continue;
             }
             params[pair[0]] = pair[1];
         }

         if(params.gid) {
             params.gid = parseInt(params.gid, 10);
         }

         return params;
     };

     var openPhotoSwipe = function(index, galleryElement, disableAnimation, fromURL) {
         var pswpElement = document.querySelectorAll('.pswp')[0],
             gallery,
             options,
             items;

         items = parseThumbnailElements(galleryElement);

         // define options (if needed)
         options = {

             // define gallery index (for URL)
             galleryUID: galleryElement.getAttribute('data-pswp-uid'),

             getThumbBoundsFn: function(index) {
                 // See Options -> getThumbBoundsFn section of documentation for more info
                 var thumbnail = items[index].el.getElementsByTagName('img')[0], // find thumbnail
                     pageYScroll = window.pageYOffset || document.documentElement.scrollTop,
                     rect = thumbnail.getBoundingClientRect(); 

                 return {x:rect.left, y:rect.top + pageYScroll, w:rect.width};
             }

         };

         // PhotoSwipe opened from URL
         if(fromURL) {
             if(options.galleryPIDs) {
                 // parse real index when custom PIDs are used
                 // http://photoswipe.com/documentation/faq.html#custom-pid-in-url
                 for(var j = 0; j < items.length; j++) {
                     if(items[j].pid == index) {
                         options.index = j;
                         break;
                     }
                 }
             } else {
                 // in URL indexes start from 1
                 options.index = parseInt(index, 10) - 1;
             }
         } else {
             options.index = parseInt(index, 10);
         }

         // exit if index not found
         if( isNaN(options.index) ) {
             return;
         }

         if(disableAnimation) {
             options.showAnimationDuration = 0;
         }

         // Pass data to PhotoSwipe and initialize it
         gallery = new PhotoSwipe( pswpElement, PhotoSwipeUI_Default, items, options);
         gallery.init();
     };

     // loop through all gallery elements and bind events
     var galleryElements = document.querySelectorAll( gallerySelector );

     for(var i = 0, l = galleryElements.length; i < l; i++) {
         galleryElements[i].setAttribute('data-pswp-uid', i+1);
         galleryElements[i].onclick = onThumbnailsClick;
     }

     // Parse URL and open gallery if it contains #&pid=3&gid=1
     var hashData = photoswipeParseHash();
     if(hashData.pid && hashData.gid) {
         openPhotoSwipe( hashData.pid ,  galleryElements[ hashData.gid - 1 ], true, true );
     }
 };

 // execute above function
 initPhotoSwipeFromDOM('.my-gallery');

例如在CodePen（重点和历史选项被禁用，由于嵌入的问题）：

 <h2>First gallery:</h2>

   <div class="my-gallery" itemscope itemtype="http://schema.org/ImageGallery">

     <figure itemprop="associatedMedia" itemscope itemtype="http://schema.org/ImageObject">
       <a href="https://farm3.staticflickr.com/2567/5697107145_a4c2eaa0cd_o.jpg" itemprop="contentUrl" data-size="1024x1024">
           <img src="https://farm3.staticflickr.com/2567/5697107145_3c27ff3cd1_m.jpg" itemprop="thumbnail" alt="Image description" />
       </a>
                                           <figcaption itemprop="caption description">Image caption  1</figcaption>

     </figure>

     <figure itemprop="associatedMedia" itemscope itemtype="http://schema.org/ImageObject">
       <a href="https://farm2.staticflickr.com/1043/5186867718_06b2e9e551_b.jpg" itemprop="contentUrl" data-size="964x1024">
           <img src="https://farm2.staticflickr.com/1043/5186867718_06b2e9e551_m.jpg" itemprop="thumbnail" alt="Image description" />
       </a>
       <figcaption itemprop="caption description">Image caption 2</figcaption>
     </figure>

     <figure itemprop="associatedMedia" itemscope itemtype="http://schema.org/ImageObject">
       <a href="https://farm7.staticflickr.com/6175/6176698785_7dee72237e_b.jpg" itemprop="contentUrl" data-size="1024x683">
           <img src="https://farm7.staticflickr.com/6175/6176698785_7dee72237e_m.jpg" itemprop="thumbnail" alt="Image description" />
       </a>
       <figcaption itemprop="caption description">Image caption 3</figcaption>
     </figure>

     <figure itemprop="associatedMedia" itemscope itemtype="http://schema.org/ImageObject">
       <a href="https://farm6.staticflickr.com/5023/5578283926_822e5e5791_b.jpg" itemprop="contentUrl" data-size="1024x768">
           <img src="https://farm6.staticflickr.com/5023/5578283926_822e5e5791_m.jpg" itemprop="thumbnail" alt="Image description" />
       </a>
       <figcaption itemprop="caption description">Image caption 4</figcaption>
     </figure>

   </div>

 <h2>Second gallery:</h2>

   <div class="my-gallery" itemscope itemtype="http://schema.org/ImageGallery">

     <figure itemprop="associatedMedia" itemscope itemtype="http://schema.org/ImageObject">
       <a href="https://farm2.staticflickr.com/1043/5186867718_06b2e9e551_b.jpg" itemprop="contentUrl" data-size="964x1024">
           <img src="https://farm2.staticflickr.com/1043/5186867718_06b2e9e551_m.jpg" itemprop="thumbnail" alt="Image description" />
       </a>
       <figcaption itemprop="caption description">Image caption 2.1</figcaption>
     </figure>

     <figure itemprop="associatedMedia" itemscope itemtype="http://schema.org/ImageObject">
       <a href="https://farm7.staticflickr.com/6175/6176698785_7dee72237e_b.jpg" itemprop="contentUrl" data-size="1024x683">
           <img src="https://farm7.staticflickr.com/6175/6176698785_7dee72237e_m.jpg" itemprop="thumbnail" alt="Image description" />
       </a>
       <figcaption itemprop="caption description">Image caption 2.2</figcaption>
     </figure>

     <figure itemprop="associatedMedia" itemscope itemtype="http://schema.org/ImageObject">
       <a href="https://farm6.staticflickr.com/5023/5578283926_822e5e5791_b.jpg" itemprop="contentUrl" data-size="1024x768">
           <img src="https://farm6.staticflickr.com/5023/5578283926_822e5e5791_m.jpg" itemprop="thumbnail" alt="Image description" />
       </a>
       <figcaption itemprop="caption description">Image caption 2.3</figcaption>
     </figure>

   </div>

 <!-- Root element of PhotoSwipe. Must have class pswp. -->
 <div class="pswp" tabindex="-1" role="dialog" aria-hidden="true">

     <!-- Background of PhotoSwipe.
          It's a separate element, as animating opacity is faster than rgba(). -->
     <div class="pswp__bg"></div>

     <!-- Slides wrapper with overflow:hidden. -->
     <div class="pswp__scroll-wrap">

         <!-- Container that holds slides. PhotoSwipe keeps only 3 slides in DOM to save memory. -->
         <!-- don't modify these 3 pswp__item elements, data is added later on. -->
         <div class="pswp__container">
             <div class="pswp__item"></div>
             <div class="pswp__item"></div>
             <div class="pswp__item"></div>
         </div>

         <!-- Default (PhotoSwipeUI_Default) interface on top of sliding area. Can be changed. -->
         <div class="pswp__ui pswp__ui--hidden">

             <div class="pswp__top-bar">

                 <!--  Controls are self-explanatory. Order can be changed. -->

                 <div class="pswp__counter"></div>

                 <button class="pswp__button pswp__button--close" title="Close (Esc)"></button>

                 <button class="pswp__button pswp__button--share" title="Share"></button>

                 <button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button>

                 <button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button>

                 <!-- Preloader demo http://codepen.io/dimsemenov/pen/yyBWoR -->
                 <!-- element will get class pswp__preloader--active when preloader is running -->
                 <div class="pswp__preloader">
                     <div class="pswp__preloader__icn">
                       <div class="pswp__preloader__cut">
                         <div class="pswp__preloader__donut"></div>
                       </div>
                     </div>
                 </div>
             </div>

             <div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap">
                 <div class="pswp__share-tooltip"></div>
             </div>

             <button class="pswp__button pswp__button--arrow--left" title="Previous (arrow left)">
             </button>

             <button class="pswp__button pswp__button--arrow--right" title="Next (arrow right)">
             </button>

             <div class="pswp__caption">
                 <div class="pswp__caption__center"></div>
             </div>

           </div>

         </div>

 </div>

 .my-gallery {
   width: 100%;
   float: left;
 }
 .my-gallery img {
   width: 100%;
   height: auto;
 }
 .my-gallery figure {
   display: block;
   float: left;
   margin: 0 5px 5px 0;
   width: 150px;
 }
 .my-gallery figcaption {
   display: none;
 }

 var initPhotoSwipeFromDOM = function(gallerySelector) {

     // parse slide data (url, title, size ...) from DOM elements
     // (children of gallerySelector)
     var parseThumbnailElements = function(el) {
         var thumbElements = el.childNodes,
             numNodes = thumbElements.length,
             items = [],
             figureEl,
             linkEl,
             size,
             item;

         for(var i = 0; i < numNodes; i++) {

             figureEl = thumbElements[i]; // <figure> element

             // include only element nodes
             if(figureEl.nodeType !== 1) {
                 continue;
             }

             linkEl = figureEl.children[0]; // <a> element

             size = linkEl.getAttribute('data-size').split('x');

             // create slide object
             item = {
                 src: linkEl.getAttribute('href'),
                 w: parseInt(size[0], 10),
                 h: parseInt(size[1], 10)
             };

             if(figureEl.children.length > 1) {
                 // <figcaption> content
                 item.title = figureEl.children[1].innerHTML;
             }

             if(linkEl.children.length > 0) {
                 // <img> thumbnail element, retrieving thumbnail url
                 item.msrc = linkEl.children[0].getAttribute('src');
             } 

             item.el = figureEl; // save link to element for getThumbBoundsFn
             items.push(item);
         }

         return items;
     };

     // find nearest parent element
     var closest = function closest(el, fn) {
         return el && ( fn(el) ? el : closest(el.parentNode, fn) );
     };

     // triggers when user clicks on thumbnail
     var onThumbnailsClick = function(e) {
         e = e || window.event;
         e.preventDefault ? e.preventDefault() : e.returnValue = false;

         var eTarget = e.target || e.srcElement;

         // find root element of slide
         var clickedListItem = closest(eTarget, function(el) {
             return (el.tagName && el.tagName.toUpperCase() === 'FIGURE');
         });

         if(!clickedListItem) {
             return;
         }

         // find index of clicked item by looping through all child nodes
         // alternatively, you may define index via data- attribute
         var clickedGallery = clickedListItem.parentNode,
             childNodes = clickedListItem.parentNode.childNodes,
             numChildNodes = childNodes.length,
             nodeIndex = 0,
             index;

         for (var i = 0; i < numChildNodes; i++) {
             if(childNodes[i].nodeType !== 1) {
                 continue;
             }

             if(childNodes[i] === clickedListItem) {
                 index = nodeIndex;
                 break;
             }
             nodeIndex++;
         }

         if(index >= 0) {
             // open PhotoSwipe if valid index found
             openPhotoSwipe( index, clickedGallery );
         }
         return false;
     };

     // parse picture index and gallery index from URL (#&pid=1&gid=2)
     var photoswipeParseHash = function() {
         var hash = window.location.hash.substring(1),
         params = {};

         if(hash.length < 5) {
             return params;
         }

         var vars = hash.split('&');
         for (var i = 0; i < vars.length; i++) {
             if(!vars[i]) {
                 continue;
             }
             var pair = vars[i].split('=');
             if(pair.length < 2) {
                 continue;
             }
             params[pair[0]] = pair[1];
         }

         if(params.gid) {
             params.gid = parseInt(params.gid, 10);
         }

         return params;
     };

     var openPhotoSwipe = function(index, galleryElement, disableAnimation, fromURL) {
         var pswpElement = document.querySelectorAll('.pswp')[0],
             gallery,
             options,
             items;

         items = parseThumbnailElements(galleryElement);

         // define options (if needed)
         options = {

             // define gallery index (for URL)
             galleryUID: galleryElement.getAttribute('data-pswp-uid'),

             getThumbBoundsFn: function(index) {
                 // See Options -> getThumbBoundsFn section of documentation for more info
                 var thumbnail = items[index].el.getElementsByTagName('img')[0], // find thumbnail
                     pageYScroll = window.pageYOffset || document.documentElement.scrollTop,
                     rect = thumbnail.getBoundingClientRect(); 

                 return {x:rect.left, y:rect.top + pageYScroll, w:rect.width};
             }

         };

         // PhotoSwipe opened from URL
         if(fromURL) {
             if(options.galleryPIDs) {
                 // parse real index when custom PIDs are used
                 // http://photoswipe.com/documentation/faq.html#custom-pid-in-url
                 for(var j = 0; j < items.length; j++) {
                     if(items[j].pid == index) {
                         options.index = j;
                         break;
                     }
                 }
             } else {
                 // in URL indexes start from 1
                 options.index = parseInt(index, 10) - 1;
             }
         } else {
             options.index = parseInt(index, 10);
         }

         // exit if index not found
         if( isNaN(options.index) ) {
             return;
         }

         if(disableAnimation) {
             options.showAnimationDuration = 0;
         }

         // Pass data to PhotoSwipe and initialize it
         gallery = new PhotoSwipe( pswpElement, PhotoSwipeUI_Default, items, options);
         gallery.init();
     };

     // loop through all gallery elements and bind events
     var galleryElements = document.querySelectorAll( gallerySelector );

     for(var i = 0, l = galleryElements.length; i < l; i++) {
         galleryElements[i].setAttribute('data-pswp-uid', i+1);
         galleryElements[i].onclick = onThumbnailsClick;
     }

     // Parse URL and open gallery if it contains #&pid=3&gid=1
     var hashData = photoswipeParseHash();
     if(hashData.pid && hashData.gid) {
         openPhotoSwipe( hashData.pid ,  galleryElements[ hashData.gid - 1 ], true, true );
     }
 };

 // execute above function
 initPhotoSwipeFromDOM('.my-gallery');

提示：您可以从CodePen例如下载在本地发挥它（编辑上CodePen - >分享 - >导出.zip文件）。

如果您使用的标记，从这个例子不同，你需要编辑功能解析缩略图元素。

如果你没有在纯JavaScript经验，不知道如何解析DOM，请参阅怪异模式和文档在MSDN上。

需要注意的是IE8不支持HTML5<图>和<figcaption>元素，所以你需要在<head>部分（托管版本的例子中使用cdnjs）html5shiv：

<!--[if lt IE 9]>
    <script src="//cdnjs.cloudflare.com/ajax/libs/html5shiv/3.7.2/html5shiv.min.js"></script>
<![endif]-->