DIV CSS 佈局教程網

先來幾張效果圖：

點擊其中一張照片可放大，可支持圖片文字描述：

同時支持分享功能：

支持手勢放大縮小

使用js框架是PhotoSwipe。 
PhotoSwipe是一個圖片放大插件，兼容pc和移動端，經歷過多個版本的迭代且一直在不斷更新，踩過的坑不知凡幾，在移動端有著巨大的優勢。
1、可控制多種風格如：
標題、分享、全屏按鈕，點擊事件、是否加入字幕，背景透明等。
2、可支持移動端觸摸手勢兼容pc端
所有的基本手勢支持：滑動下一個或上一個，拖動平移、縮放、放大或關閉，點擊切換控件，雙擊放大或縮放。
3、分享
默認的UI有一個按鈕，分享鏈接。默認的鏈接是facebook，推特和Pinterest，但你可以通過API設置分享類型。
4、用戶界面
用戶界面是完全從核心腳本分離。完全可以自定義界面。默認photoswipe UI是響應式的，桌面、平板電腦和移動設備完全可以使用。 
5、更多功能等你發現。 
官網：http://photoswipe.com/ 
github：https://github.com/dimsemenov/photoswipe

1、在官網下載PhotoSwipe，在頁面中引入

<link rel="stylesheet prefetch" href="css/photoswipe.css">
<link rel="stylesheet prefetch" href="css/default-skin/default-skin.css">
<script src="js/photoswipe.js"></script>
<script src="js/photoswipe-ui-default.min.js"></script> 

2、頁面中必須加入以下代碼結構（此結構是插件圖片浏覽必須代碼，作者並沒有集成到js中，所以使用者必須手動加入自己的網頁中）：

<!-- 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>

 <!-- 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>

3、需要浏覽的圖片加入photoswipe結構代碼，這裡需要注意的是
 data-pswp-uid在每個相冊中必須是唯一的，data-size是指定放大時圖片顯示的寬和高，若指定的寬高與圖片不符會導致顯示的圖片變形；目前還沒找到去掉 data-size的辦法，但然有時間可以找下替代辦法。

<!--data-pswp-uid在每個相冊中必須是唯一的，data-size指定放大時圖片顯示的寬和高-->
<div class="my-gallery" data-pswp-uid="1">
　　<figure>
  <a href="img/m3.jpg" data-size="670x712">
  <img src="img/th1.jpg">
  </a>
  </figure>
</div>

4、加入js代碼，此代碼作者也沒有集成到photoswipe框架中，需要自己手動加入網頁裡

<script type="text/javascript">
 var initPhotoSwipeFromDOM = function(gallerySelector) {

 // 解析來自DOM元素幻燈片數據（URL，標題，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

 // 僅包括元素節點
 if(figureEl.nodeType !== 1) {
 continue;
 } 25 linkEl = figureEl.children[0]; // <a> element
 
 size = linkEl.getAttribute('data-size').split('x');

 // 創建幻燈片對象
 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> 縮略圖節點, 檢索縮略圖網址
 item.msrc = linkEl.children[0].getAttribute('src');
 }

 item.el = figureEl; // 保存鏈接元素 for getThumbBoundsFn
 items.push(item);
 }

 return items;
 };

 // 查找最近的父節點
 var closest = function closest(el, fn) {
 return el && ( fn(el) ? el : closest(el.parentNode, fn) );
 };

 // 當用戶點擊縮略圖觸發
 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);

 // 這裡可以定義參數
 options = {
 barsSize: { 
 top: 100,
 bottom: 100
 }, 
 fullscreenEl : false, // 是否支持全屏按鈕
 shareButtons: [
 {id:'wechat', label:'分享微信', url:'#'},
 {id:'weibo', label:'新浪微博', url:'#'},
 {id:'download', label:'保存圖片', url:'{{raw_image_url}}', download:true}
 ], // 分享按鈕

 // 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>

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