手机端点击图片放大特效-PhotoSwipe插件

PhotoSwipe插件官方网站 http://www.photoswipe.com/

PhotoSwipe插件能实现手机端点击图片全屏放大 再双击图片放大等功能

但有一点不太好的是图片放大后再单击不能关闭浏览，要点击关闭按钮或者滑动才能关闭，找了好久配置项都没说到这点上的，只能自己动手改了。

打开photoswipe.js，大概在3179行有个关于tap的函数定义
在开头先定义一个变量

var tap_num = 0;

然后在onTapStart的定义里加入

//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

大概整体就是这样

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);
            }
        }
    }
});

把修改后的photoswipe.js压缩一下，就能实现自己想要的功能了

另外，使用photoswipe插件需要插入框架和JavaScript代码，可以把这些代码整合成一个js再引入，这样页面看起来就简洁了很多。
先在html写上图片相册结构，并配上样式

<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>

整理后的js

document.writeln("");
document.writeln("
");
document.writeln("");
document.writeln("    ");
document.writeln("    
<\/div>");
document.writeln("");
document.writeln("    ");
document.writeln("    
");
document.writeln("");
document.writeln("        ");
document.writeln("        
");
document.writeln("            
<\/div>");
document.writeln("            
<\/div>");
document.writeln("            
<\/div>");
document.writeln("        <\/div>");
document.writeln("");
document.writeln("        ");
document.writeln("        
");
document.writeln("");
document.writeln("            
");
document.writeln("");
document.writeln("                ");
document.writeln("");
document.writeln("                
<\/div>");
document.writeln("");
document.writeln("                <\/button>");
document.writeln("");
document.writeln("                <\/button>");
document.writeln("");
document.writeln("                <\/button>");
document.writeln("");
document.writeln("                <\/button>");
document.writeln("");
document.writeln("                ");
document.writeln("                ");
document.writeln("                
");
document.writeln("                    
");
document.writeln("                        
");
document.writeln("                            
<\/div>");
document.writeln("                        <\/div>");
document.writeln("                    <\/div>");
document.writeln("                <\/div>");
document.writeln("            <\/div>");
document.writeln("");
document.writeln("            
");
document.writeln("                
<\/div>");
document.writeln("            <\/div>");
document.writeln("");
document.writeln("            ");
document.writeln("            <\/button>");
document.writeln("");
document.writeln("            ");
document.writeln("            <\/button>");
document.writeln("");
document.writeln("            
");
document.writeln("                
<\/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 +  '
Photo: ' + item.author + '';
                        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');

    })();