移動端圖片預覽且可以手勢縮放
首先進入http://photoswipe.com/官網下載photoswipe.js,然後引入default-skin.css，photoswipe.css，photoswipe.min.js，photoswipe-ui-default.min.js四個檔案，但是不知道那個檔案會引用到一個svg圖片所以還需要把default-skin.svg也一併放入資料夾中。
所有程式碼：
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>photoswipe的使用</title>
<link rel="stylesheet prefetch" href="css/photoswipe.css">
<link rel="stylesheet prefetch" href="css/default-skin.css">
<style>
* {margin: 0;padding: 0;}
.clearfix::before, .clearfix::after {
display: block;
content: '';
visibility: hidden;
height: 100%;
clear: both;
}
body {padding-top: 2%;}
.my-gallery {width:96%;margin: 0 auto;}
.my-gallery .img-dv {width:100%;margin-bottom: 1%;}
.my-gallery .img-dv a {display:block;width:100%;text-align: center}
.my-gallery .img-dv a img {width:100%;}
</style>
</head>
<body>
<!--如果有多個data-pswp-uid 它的值是不能重複的-->
<div class="my-gallery" data-pswp-uid="1">
<figure>
<div class="img-dv"><a href="img/1.png" data-size="1920x1080"><img src="img/1.png"></a></div>
</figure>
</div>
<div class="pswp" tabindex="-1" role="dialog" aria-hidden="true">
<div class="pswp__bg"></div>
<div class="pswp__scroll-wrap">
<div class="pswp__container">
<div class="pswp__item"></div>
<div class="pswp__item"></div>
<div class="pswp__item"></div>
</div>
<div class="pswp__ui pswp__ui--hidden">
<div class="pswp__top-bar">
<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>
<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>
</body>
<script src="js/photoswipe.min.js"></script>
<script src="js/photoswipe-ui-default.min.js"></script>
<script type="text/javascript">
var initPhotoSwipeFromDOM = function(gallerySelector) {
// 解析來自DOM元素幻燈片資料（URL，標題，大小...）
var parseThumbnailElements = function(el) {
var thumbElements = el.childNodes,
numNodes = thumbElements.length,
items = [],
figureEl,
linkEl,
size,
item,
divEl;
for(var i = 0; i < numNodes; i++) {
figureEl = thumbElements[i]; // <figure> element
// 僅包括元素節點
if(figureEl.nodeType !== 1) {
continue;
}
divEl = figureEl.children[0];
linkEl = divEl.children[0]; // <a> element
size = linkEl.getAttribute('data-size').split('x');
// 建立幻燈片物件
item = {
src: linkEl.getAttribute('href'),
w: parseInt(size[0], 10),
h: parseInt(size[1], 10)
};
if(figureEl.children.length > 1) {
item.title = figureEl.children[1].innerHTML;
}
if(linkEl.children.length > 0) {
// <img> 縮圖節點, 檢索縮圖網址
item.msrc = linkEl.children[0].getAttribute('src');
}
item.el = figureEl; // 儲存連結元素 for getThumbBoundsFn
items.push(item);
}
return items;
};
// 查詢最近的父節點
var closest = function closest(el, fn) {
return el && ( fn(el) ? el : closest(el.parentNode, fn) );
};
// 當用戶點選縮圖觸發
var onThumbnailsClick = function(e) {
e = e || window.event;
e.preventDefault ? e.preventDefault() : e.returnValue = false;
var eTarget = e.target || e.srcElement;
var clickedListItem = closest(eTarget, function(el) {
return (el.tagName && el.tagName.toUpperCase() === 'FIGURE');
});
if(!clickedListItem) {
return;
}
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) {
openPhotoSwipe( index, clickedGallery );
}
return false;
};
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);
options = {
barsSize: {
top: 100,
bottom: 100
},
fullscreenEl : false,
shareButtons: [],
galleryUID: galleryElement.getAttribute('data-pswp-uid'),
getThumbBoundsFn: function(index) {
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};
}
};
if(fromURL) {
if(options.galleryPIDs) {
for(var j = 0; j < items.length; j++) {
if(items[j].pid == index) {
options.index = j;
break;
}
}
} else {
options.index = parseInt(index, 10) - 1;
}
} else {
options.index = parseInt(index, 10);
}
if( isNaN(options.index) ) {
return;
}
if(disableAnimation) {
options.showAnimationDuration = 0;
}
gallery = new PhotoSwipe( pswpElement, PhotoSwipeUI_Default, items, options);
gallery.init();
};
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;
}
var hashData = photoswipeParseHash();
if(hashData.pid && hashData.gid) {
openPhotoSwipe( hashData.pid , galleryElements[ hashData.gid - 1 ], true, true );
}
};
initPhotoSwipeFromDOM('.my-gallery');
</script>
</html>
這樣就可以了，當然如果是要預覽多個圖片，只要在節點上面加
<figure>
<div class="img-dv"><a href="img/1.png" data-size="1920x1080"><img src="img/1.png"></a></div>
</figure>
就可以實現了。