先来几张效果图：
点击其中一张照片可放大，可支持图片文字描述：
同时支持分享功能：
支持手势放大缩小
使用js框架是PhotoSwipe。
PhotoSwipe是一个图片放大插件，兼容pc和移动端，经历过多个版本的迭代且一直在不断更新，踩过的坑不知凡几，在移动端有着巨大的优势。
1、可控制多种风格如：
标题、分享、全屏按钮，点击事件、是否加入字幕，背景透明等。
2、可支持移动端触摸手势兼容pc端
所有的基本手势支持：滑动下一个或上一个，拖动平移、缩放、放大或关闭，点击切换控件，双击放大或缩放。
3、分享
默认的UI有一个按钮，分享链接。默认的链接是facebook，推特和Pinterest，但你可以通过API设置分享类型。
4、用户界面
用户界面是完全从核心脚本分离。完全可以自定义界面。默认photoswipe UI是响应式的，桌面、平板电脑和移动设备完全可以使用。
5、更多功能等你发现。
官网：
github：https://github.com/dimsemenov/photoswipe
1、在官网下载PhotoSwipe，在页面中引入
<link href="https://www.jb51.net/css/photoswipe.css"> <link href="https://www.jb51.net/css/default-skin/default-skin.css"> <script src="https://www.jb51.net/js/photoswipe.js"></script> <script src="https://www.jb51.net/js/photoswipe-ui-default.min.js"></script>
2、页面中必须加入以下代码结构（此结构是插件图片浏览必须代码，作者并没有集成到js中，所以使用者必须手动加入自己的网页中）：
<!-- Root element of PhotoSwipe. Must have class pswp. --> <div tabindex="-1" role="dialog" aria-hidden="true"> <!-- Background of PhotoSwipe. It's a separate element as animating opacity is faster than rgba(). --> <div></div> <!-- Slides wrapper with overflow:hidden. --> <div> <!-- 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> <div></div> <div></div> <div></div> </div> <!-- Default (PhotoSwipeUI_Default) interface on top of sliding area. Can be changed. --> <div> <div> <!-- Controls are self-explanatory. Order can be changed. --> <div></div> <button title="Close (Esc)"></button> <button title="Share"></button> <button title="Toggle fullscreen"></button> <button title="Zoom in/out"></button> <!-- element will get class pswp__preloader--active when preloader is running --> <div> <div> <div> <div></div> </div> </div> </div> </div> <div> <div></div> </div> <button title="Previous (arrow left)"> </button> <button title="Next (arrow right)"> </button> <div> <div></div> </div> </div> </div> </div>
3、需要浏览的图片加入photoswipe结构代码，这里需要注意的是
data-pswp-uid在每个相册中必须是唯一的，data-size是指定放大时图片显示的宽和高，若指定的宽高与图片不符会导致显示的图片变形；目前还没找到去掉 data-size的办法，但然有时间可以找下替代办法。
<!--data-pswp-uid在每个相册中必须是唯一的，data-size指定放大时图片显示的宽和高--> <div data-pswp-uid="1"> <figure> <a href="https://www.jb51.net/img/m3.jpg" data-size="670x712"> <img src="https://www.jb51.net/img/th1.jpg"> </a> </figure> </div>
4、加入js代码，此代码作者也没有集成到photoswipe框架中，需要自己手动加入网页里
<script type="text/javascript"> var initPhotoSwipeFromDOM = function(gallerySelector) { // 解析来自DOM元素幻灯片数据（URL，标题，大小...） // (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 // 仅包括元素节点 if(figureEl.nodeType !== 1) { continue; } 25 linkEl = figureEl.children[0]; // <a> element size = linkEl.getAttribute('data-size').split('x'); // 创建幻灯片对象 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> 缩略图节点, 检索缩略图网址 item.msrc = linkEl.children[0].getAttribute('src'); } item.el = figureEl; // 保存链接元素 for getThumbBoundsFn items.push(item); } return items; }; // 查找最近的父节点 var closest = function closest(el, fn) { return el && ( fn(el) ? el : closest(el.parentNode, fn) ); }; // 当用户点击缩略图触发 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); // 这里可以定义参数 options = { barsSize: { top: 100, bottom: 100 }, fullscreenEl : false, // 是否支持全屏按钮 shareButtons: [ {id:'wechat', label:'分享微信', url:'#'}, {id:'weibo', label:'新浪微博', url:'#'}, {id:'download', label:'保存图片', url:'{{raw_image_url}}', download:true} ], // 分享按钮 // 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 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'); </script>
本文已被整理到了《JavaScript微信开发技巧汇总》，欢迎大家学习阅读。