jQuery实现朋友圈查看图片

jQuery实现朋友圈查看图片效果，供大家参考，具体内容如下

效果： 图片点击显示大图，多张图可以滑动，左右按钮点击可切换查看图片 （左右点击切换效果不需要删除样式即可）

左右切换按钮图片 arrows.png（不需要可删除）

touchTouch.jquery.js 文件

(function(){
 /* Private variables */
 var overlay = $('<div id="galleryOverlay">'),
 slider = $('<div id="gallerySlider">'),
 prevArrow = $('<a id="prevArrow"></a>'),
 nextArrow = $('<a id="nextArrow"></a>'),
 pageSpan = $('<span id="pagelimit"></span'),
 overlayVisible = false;
 
 /* Creating the plugin */
 $.fn.touchTouch = function(){
 var placeholders = $([]),
 pl1=[],
 index = 0,
 items = this;
 
 // Appending the markup to the page
 overlay.hide().appendTo('body');
 slider.appendTo(overlay);
 pageSpan.appendTo(overlay);
 
 // Creating a placeholder for each image
 items.each(function(){
 placeholders = placeholders.add($('<div class="placeholder">'));
 });
 
 // Hide the gallery if the background is touched / clicked
 slider.append(placeholders).on('click',function(e){
 hideOverlay(); 
 });
 
 // Listen for touch events on the body and check if they
 // originated in #gallerySlider img - the images in the slider.
 $('body').on('touchstart', '#gallerySlider img', function(e){
 var touch = e.originalEvent,
 startX = touch.changedTouches[0].pageX;
 slider.on('touchmove',function(e){
 e.preventDefault();
 touch = e.originalEvent.touches[0] ||e.originalEvent.changedTouches[0];
 if(touch.pageX - startX > 10){
 slider.off('touchmove');
 showPrevious();
 }
 else if (touch.pageX - startX < -10){
 slider.off('touchmove');
 showNext();
 }
 
 });

 // Return false to prevent image 
 // highlighting on Android
 return false;
 }).on('touchend',function(){
 slider.off('touchmove');
 });
 
 // Listening for clicks on the thumbnails
 
 //评论事件
 
 items.on('click', function(e){
 e.preventDefault();
 // Find the position of this image
 // in the collection
 
 index = items.index(this);
 showOverlay(index);
 showImage(index);
 
 calcPages(items,index);
 // Preload the next image
 preload(index+1);
 
 // Preload the previous
 preload(index-1);
 $(document).data("overlayVisible",true);
 e.cancelBubble = true; //取消冒泡事件
 //e.stopPropagation(); 
 
 });
 
 
 
 function calcPages(items,index){
 pageSpan.text((index+1)+"/"+items.length);
 }
 // If the browser does not have support 
 // for touch, display the arrows
 if ( !("ontouchstart" in window) ){
 overlay.append(prevArrow).append(nextArrow);
 
 prevArrow.click(function(e){
 e.preventDefault();
 showPrevious();
 });
 
 nextArrow.click(function(e){
 e.preventDefault();
 showNext();
 });
 }
 
 // Listen for arrow keys
 $(window).bind('keydown', function(e){
 if (e.keyCode == 37){
 showPrevious();
 }
 else if (e.keyCode==39){
 showNext();
 }
 });
 
 
 /* Private functions */
 
 
 function showOverlay(index){
 // If the overlay is already shown, exit
 if (overlayVisible){
 return false;
 }
 
 // Show the overlay
 overlay.show();
 
 setTimeout(function(){
 // Trigger the opacity CSS transition
 overlay.addClass('visible');
 }, 100);
 
 // Move the slider to the correct image
 offsetSlider(index);
 
 // Raise the visible flag
 overlayVisible = true;
 }
 
 function hideOverlay(){
 // If the overlay is not shown, exit
 
 if(!overlayVisible){
 return false;
 }
 
 // Hide the overlay
 overlay.hide().removeClass('visible');
 overlayVisible = false;
 $(document).data("overlayVisible",overlayVisible);
 }
 
 function offsetSlider(index){
 // This will trigger a smooth css transition
 slider.css('left',(-index*100)+'%');
 }
 
 // Preload an image by its index in the items array
 function preload(index){
 setTimeout(function(){
 showImage(index);
 }, 1000);
 }
 
 // Show image in the slider
 function showImage(index){
 
 // If the index is outside the bonds of the array
 if(index < 0 || index >= items.length){
 return false;
 }
 
 // Call the load function with the href attribute of the item
 loadImage(items.eq(index).attr('href'), function(){
 placeholders.eq(index).html(this);
 });
 }
 
 // Load the image and execute a callback function.
 // Returns a jQuery object
 
 function loadImage(src, callback){
 var img = $('<img>').on('load', function(){
 callback.call(img);
 });
 img.attr('src',src);
 }
 
 function showNext(){
 
 // If this is not the last image
 if(index+1 < items.length){
 index++;
 offsetSlider(index);
 preload(index+1);
 calcPages(items,index);
 }
 else{
 // Trigger the spring animation
 
 slider.addClass('rightSpring');
 setTimeout(function(){
 slider.removeClass('rightSpring');
 },500);
 }
 }
 
 function showPrevious(){
 
 // If this is not the first image
 if(index>0){
 index--;
 offsetSlider(index);
 preload(index-1);
 calcPages(items,index);
 }
 else{
 // Trigger the spring animation
 slider.addClass('leftSpring');
 setTimeout(function(){
 slider.removeClass('leftSpring');
 },500);
 }
 }
 };
})(jQuery);

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