手机端点击图片放大特效PhotoSwipe.js插件实现

//根据需求自己添加的S//判断是单击还是双击 单击关闭 双击放大tap_num++;if(tap_num < 2){ setTimeout(function(){  if(tap_num > 1){   tap_num = 0;   return;  }else{   tap_num = 0;   //判断是否有拖拽 如有拖拽触发拖拽事件 没有则关闭   if(_isDragging){    return;   }else{    self.close();   }  } },200);}//根据需求自己添加的E

var tapTimer, tapReleasePoint = {}, _dispatchTapEvent = function(origEvent, releasePoint, pointerType) {    var e = document.createEvent( 'CustomEvent' ),   eDetail = {    origEvent:origEvent,     target:origEvent.target,     releasePoint: releasePoint,     pointerType:pointerType || 'touch'   };  e.initCustomEvent( 'pswpTap', true, true, eDetail );  origEvent.target.dispatchEvent(e); };var tap_num = 0;_registerModule('Tap', { publicMethods: {  initTap: function() {   _listen('firstTouchStart', self.onTapStart);   _listen('touchRelease', self.onTapRelease);   _listen('destroy', function() {    tapReleasePoint = {};    tapTimer = null;   });  },  onTapStart: function(touchList) {   if(touchList.length > 1) {    clearTimeout(tapTimer);    tapTimer = null;   }   //根据需求自己添加的S   //判断是单击还是双击 单击关闭 双击放大   tap_num++;   if(tap_num < 2){    setTimeout(function(){     if(tap_num > 1){      tap_num = 0;      return;     }else{      tap_num = 0;      //判断是否有拖拽 如有拖拽触发拖拽事件 没有则关闭      if(_isDragging){       return;      }else{       self.close();      }     }    },200);   }   //根据需求自己添加的E  },  onTapRelease: function(e, releasePoint) {   if(!releasePoint) {    return;   }   if(!_moved && !_isMultitouch && !_numAnimations) {    var p0 = releasePoint;    if(tapTimer) {     clearTimeout(tapTimer);     tapTimer = null;     // Check if taped on the same place     if ( _isNearbyPoints(p0, tapReleasePoint) ) {      _shout('doubleTap', p0);      return;     }    }    if(releasePoint.type === 'mouse') {     _dispatchTapEvent(e, releasePoint, 'mouse');     return;    }    var clickedTagName = e.target.tagName.toUpperCase();    // avoid double tap delay on buttons and elements that have class pswp__single-tap    if(clickedTagName === 'BUTTON' || framework.hasClass(e.target, 'pswp__single-tap') ) {     _dispatchTapEvent(e, releasePoint);     return;    }    _equalizePoints(tapReleasePoint, p0);    tapTimer = setTimeout(function() {     _dispatchTapEvent(e, releasePoint);     tapTimer = null;    }, 300);   }  } }});

<div id="demo-test-gallery" class="demo-gallery"> <a href="https://farm4.staticflickr.com/3894/15008518202_c265dfa55f_h.jpg" data-size="1600x1600" data-med="https://farm4.staticflickr.com/3894/15008518202_b016d7d289_b.jpg" data-med-size="1024x1024">  <img src="https://farm4.staticflickr.com/3894/15008518202_b016d7d289_m.jpg" alt="" /> </a> <a href="https://farm6.staticflickr.com/5591/15008867125_b61960af01_h.jpg" data-size="1600x1068" data-med="https://farm6.staticflickr.com/5591/15008867125_68a8ed88cc_b.jpg" data-med-size="1024x1024">  <img src="https://farm6.staticflickr.com/5591/15008867125_68a8ed88cc_m.jpg" alt="" /> </a></div>

document.writeln("<!-- Root element of PhotoSwipe. Must have class pswp. -->");document.writeln("<div class=/"pswp/" tabindex=/"-1/" role=/"dialog/" aria-hidden=/"true/">");document.writeln("");document.writeln(" <!-- Background of PhotoSwipe.");document.writeln("   It/'s a separate element as animating opacity is faster than rgba(). -->");document.writeln(" <div class=/"pswp__bg/"><//div>");document.writeln("");document.writeln(" <!-- Slides wrapper with overflow:hidden. -->");document.writeln(" <div class=/"pswp__scroll-wrap/">");document.writeln("");document.writeln("  <!-- Container that holds slides.");document.writeln("   PhotoSwipe keeps only 3 of them in the DOM to save memory.");document.writeln("   Don/'t modify these 3 pswp__item elements, data is added later on. -->");document.writeln("  <div class=/"pswp__container/">");document.writeln("   <div class=/"pswp__item/"><//div>");document.writeln("   <div class=/"pswp__item/"><//div>");document.writeln("   <div class=/"pswp__item/"><//div>");document.writeln("  <//div>");document.writeln("");document.writeln("  <!-- Default (PhotoSwipeUI_Default) interface on top of sliding area. Can be changed. -->");document.writeln("  <div class=/"pswp__ui pswp__ui--hidden/">");document.writeln("");document.writeln("   <div class=/"pswp__top-bar/">");document.writeln("");document.writeln("    <!-- Controls are self-explanatory. Order can be changed. -->");document.writeln("");document.writeln("    <div class=/"pswp__counter/"><//div>");document.writeln("");document.writeln("    <button class=/"pswp__button pswp__button--close/" title=/"Close (Esc)/"><//button>");document.writeln("");document.writeln("    <button class=/"pswp__button pswp__button--share/" title=/"Share/"><//button>");document.writeln("");document.writeln("    <button class=/"pswp__button pswp__button--fs/" title=/"Toggle fullscreen/"><//button>");document.writeln("");document.writeln("    <button class=/"pswp__button pswp__button--zoom/" title=/"Zoom in//out/"><//button>");document.writeln("");document.writeln("    <!-- Preloader demo http:////codepen.io//dimsemenov//pen//yyBWoR -->");document.writeln("    <!-- element will get class pswp__preloader--active when preloader is running -->");document.writeln("    <div class=/"pswp__preloader/">");document.writeln("     <div class=/"pswp__preloader__icn/">");document.writeln("      <div class=/"pswp__preloader__cut/">");document.writeln("       <div class=/"pswp__preloader__donut/"><//div>");document.writeln("      <//div>");document.writeln("     <//div>");document.writeln("    <//div>");document.writeln("   <//div>");document.writeln("");document.writeln("   <div class=/"pswp__share-modal pswp__share-modal--hidden pswp__single-tap/">");document.writeln("    <div class=/"pswp__share-tooltip/"><//div>");document.writeln("   <//div>");document.writeln("");document.writeln("   <button class=/"pswp__button pswp__button--arrow--left/" title=/"Previous (arrow left)/">");document.writeln("   <//button>");document.writeln("");document.writeln("   <button class=/"pswp__button pswp__button--arrow--right/" title=/"Next (arrow right)/">");document.writeln("   <//button>");document.writeln("");document.writeln("   <div class=/"pswp__caption/">");document.writeln("    <div class=/"pswp__caption__center/"><//div>");document.writeln("   <//div>");document.writeln("");document.writeln("  <//div>");document.writeln("");document.writeln(" <//div>");document.writeln("");document.writeln("<//div>");(function() {  var initPhotoSwipeFromDOM = function(gallerySelector) {   var parseThumbnailElements = function(el) {    var thumbElements = el.childNodes,      numNodes = thumbElements.length,      items = [],      el,      childElements,      thumbnailEl,      size,      item;    for(var i = 0; i < numNodes; i++) {     el = thumbElements[i];     // include only element nodes     if(el.nodeType !== 1) {      continue;     }     childElements = el.children;     size = el.getAttribute('data-size').split('x');     // create slide object     item = {      src: el.getAttribute('href'),      w: parseInt(size[0], 10),      h: parseInt(size[1], 10),      author: el.getAttribute('data-author')     };     item.el = el; // save link to element for getThumbBoundsFn     if(childElements.length > 0) {      item.msrc = childElements[0].getAttribute('src'); // thumbnail url      if(childElements.length > 1) {       item.title = childElements[1].innerHTML; // caption (contents of figure)      }     }     var mediumSrc = el.getAttribute('data-med');     if(mediumSrc) {      size = el.getAttribute('data-med-size').split('x');      // "medium-sized" image      item.m = {       src: mediumSrc,       w: parseInt(size[0], 10),       h: parseInt(size[1], 10)      };     }     // original image     item.o = {      src: item.src,      w: item.w,      h: item.h     };     items.push(item);    }    return items;   };   // find nearest parent element   var closest = function closest(el, fn) {    return el && ( fn(el) ? el : closest(el.parentNode, fn) );   };   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 === 'A';    });    if(!clickedListItem) {     return;    }    var clickedGallery = clickedListItem.parentNode;    var 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) { // pid=1     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 = {     galleryUID: galleryElement.getAttribute('data-pswp-uid'),     getThumbBoundsFn: function(index) {      // See Options->getThumbBoundsFn section of docs for more info      var thumbnail = items[index].el.children[0],        pageYScroll = window.pageYOffset || document.documentElement.scrollTop,        rect = thumbnail.getBoundingClientRect();      return {x:rect.left, y:rect.top + pageYScroll, w:rect.width};     },     addCaptionHTMLFn: function(item, captionEl, isFake) {      if(!item.title) {       captionEl.children[0].innerText = '';       return false;      }      captionEl.children[0].innerHTML = item.title + '<br/><small>Photo: ' + item.author + '</small>';      return true;     }    };    // options for control bar    options.shareEl = false;    options.fullscreenEl = false;    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 {      options.index = parseInt(index, 10) - 1;     }    } else {     options.index = parseInt(index, 10);    }    // exit if index not found    if( isNaN(options.index) ) {     return;    }    // Pass data to PhotoSwipe and initialize it    gallery = new PhotoSwipe( pswpElement, PhotoSwipeUI_Default, items, options);    // see: http://photoswipe.com/documentation/responsive-images.html    var realViewportWidth,      useLargeImages = false,      firstResize = true,      imageSrcWillChange;    gallery.listen('beforeResize', function() {     var dpiRatio = window.devicePixelRatio ? window.devicePixelRatio : 1;     dpiRatio = Math.min(dpiRatio, 2.5);     realViewportWidth = gallery.viewportSize.x * dpiRatio;     if(realViewportWidth >= 1200 || (!gallery.likelyTouchDevice && realViewportWidth > 800) || screen.width > 1200 ) {      if(!useLargeImages) {       useLargeImages = true;       imageSrcWillChange = true;      }     } else {      if(useLargeImages) {       useLargeImages = false;       imageSrcWillChange = true;      }     }     if(imageSrcWillChange && !firstResize) {      gallery.invalidateCurrItems();     }     if(firstResize) {      firstResize = false;     }     imageSrcWillChange = false;    });    gallery.listen('gettingData', function(index, item) {     if( useLargeImages ) {      item.src = item.o.src;      item.w = item.o.w;      item.h = item.o.h;     } else {      item.src = item.m.src;      item.w = item.m.w;      item.h = item.m.h;     }    });    gallery.init();   };   // select all gallery elements   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 );   }  };  initPhotoSwipeFromDOM('.demo-gallery'); })();