swipe.js
swipe插件真的是好简单，看代码就知道了
先把swipe.js放上来，有空再拜读一下，看能否理解
/* * Swipe 2.0 * * Brad Birdsall * Copyright 2013, MIT License * */ function Swipe(container, options) { "use strict"; // utilities var noop = function() {}; // simple no operation function var offloadFn = function(fn) { setTimeout(fn || noop, 0) }; // offload a functions execution // check browser capabilities var browser = { addEventListener: !!window.addEventListener, touch: ('ontouchstart' in window) || window.DocumentTouch && document instanceof DocumentTouch, transitions: (function(temp) { var props = ['transitionProperty', 'WebkitTransition', 'MozTransition', 'OTransition', 'msTransition']; for ( var i in props ) if (temp.style[ props[i] ] !== undefined) return true; return false; })(document.createElement('swipe')) }; // quit if no root element if (!container) return; //如果不存在元素 则返回 var element = container.children[0]; //元素的第一个，如果有多个，可以修改 var slides, slidePos, width, length; // options = options || {}; //参数为空的话就赋值一个空的对象给options var index = parseInt(options.startSlide, 10) || 0; //开始显示第几个图片或者元素，默认为0 var speed = options.speed || 300; //速度 options.continuous = options.continuous !== undefined ? options.continuous : true;//默认为true function setup() { // cache slides slides = element.children; //获取子元素 length = slides.length; //子元素长度 // set continuous to false if only one slide if (slides.length < 2) options.continuous = false; //如果少于2个，则不需要滚动 //special case if two slides if (browser.transitions && options.continuous && slides.length < 3) { element.appendChild(slides[0].cloneNode(true)); element.appendChild(element.children[1].cloneNode(true)); slides = element.children; } // create an array to store current positions of each slide slidePos = new Array(slides.length); // determine width of each slide width = container.getBoundingClientRect().width || container.offsetWidth; element.style.width = (slides.length * width) + 'px'; // stack elements var pos = slides.length; while(pos--) { var slide = slides[pos]; slide.style.width = width + 'px'; slide.setAttribute('data-index', pos); if (browser.transitions) { slide.style.left = (pos * -width) + 'px'; move(pos, index > pos ? -width : (index < pos ? width : 0), 0); } } // reposition elements before and after index if (options.continuous && browser.transitions) { move(circle(index-1), -width, 0); move(circle(index+1), width, 0); } if (!browser.transitions) element.style.left = (index * -width) + 'px'; container.style.visibility = 'visible'; } function prev() { if (options.continuous) slide(index-1); else if (index) slide(index-1); } function next() { if (options.continuous) slide(index+1); else if (index < slides.length - 1) slide(index+1); } function circle(index) { // a simple positive modulo using slides.length return (slides.length + (index % slides.length)) % slides.length; } function slide(to, slideSpeed) { // do nothing if already on requested slide if (index == to) return; if (browser.transitions) { var direction = Math.abs(index-to) / (index-to); // 1: backward, -1: forward // get the actual position of the slide if (options.continuous) { var natural_direction = direction; direction = -slidePos[circle(to)] / width; // if going forward but to < index, use to = slides.length + to // if going backward but to > index, use to = -slides.length + to if (direction !== natural_direction) to = -direction * slides.length + to; } var diff = Math.abs(index-to) - 1; // move all the slides between index and to in the right direction while (diff--) move( circle((to > index ? to : index) - diff - 1), width * direction, 0); to = circle(to); move(index, width * direction, slideSpeed || speed); move(to, 0, slideSpeed || speed); if (options.continuous) move(circle(to - direction), -(width * direction), 0); // we need to get the next in place } else { to = circle(to); animate(index * -width, to * -width, slideSpeed || speed); //no fallback for a circular continuous if the browser does not accept transitions } index = to; offloadFn(options.callback && options.callback(index, slides[index])); } function move(index, dist, speed) { translate(index, dist, speed); slidePos[index] = dist; } function translate(index, dist, speed) { var slide = slides[index]; var style = slide && slide.style; if (!style) return; style.webkitTransitionDuration = style.MozTransitionDuration = style.msTransitionDuration = style.OTransitionDuration = style.transitionDuration = speed + 'ms'; style.webkitTransform = 'translate(' + dist + 'px,0)' + 'translateZ(0)'; style.msTransform = style.MozTransform = style.OTransform = 'translateX(' + dist + 'px)'; } function animate(from, to, speed) { // if not an animation, just reposition if (!speed) { element.style.left = to + 'px'; return; } var start = +new Date; var timer = setInterval(function() { var timeElap = +new Date - start; if (timeElap > speed) { element.style.left = to + 'px'; if (delay) begin(); options.transitionEnd && options.transitionEnd.call(event, index, slides[index]); clearInterval(timer); return; } element.style.left = (( (to - from) * (Math.floor((timeElap / speed) * 100) / 100) ) + from) + 'px'; }, 4); } // setup auto slideshow var delay = options.auto || 0; var interval; function begin() { interval = setTimeout(next, delay); } function stop() { delay = 0; clearTimeout(interval); } // setup initial vars var start = {}; var delta = {}; var isScrolling; // setup event capturing var events = { handleEvent: function(event) { switch (event.type) { case 'touchstart': this.start(event); break; case 'touchmove': this.move(event); break; case 'touchend': offloadFn(this.end(event)); break; case 'webkitTransitionEnd': case 'msTransitionEnd': case 'oTransitionEnd': case 'otransitionend': case 'transitionend': offloadFn(this.transitionEnd(event)); break; case 'resize': offloadFn(setup); break; } if (options.stopPropagation) event.stopPropagation(); }, start: function(event) { var touches = event.touches[0]; // measure start values start = { // get initial touch coords x: touches.pageX, y: touches.pageY, // store time to determine touch duration time: +new Date }; // used for testing first move event isScrolling = undefined; // reset delta and end measurements delta = {}; // attach touchmove and touchend listeners element.addEventListener('touchmove', this, false); element.addEventListener('touchend', this, false); }, move: function(event) { // ensure swiping with one touch and not pinching if ( event.touches.length > 1 || event.scale && event.scale !== 1) return if (options.disableScroll) event.preventDefault(); var touches = event.touches[0]; // measure change in x and y delta = { x: touches.pageX - start.x, y: touches.pageY - start.y } // determine if scrolling test has run - one time test if ( typeof isScrolling == 'undefined') { isScrolling = !!( isScrolling || Math.abs(delta.x) < Math.abs(delta.y) ); } // if user is not trying to scroll vertically if (!isScrolling) { // prevent native scrolling event.preventDefault(); // stop slideshow stop(); // increase resistance if first or last slide if (options.continuous) { // we don't add resistance at the end translate(circle(index-1), delta.x + slidePos[circle(index-1)], 0); translate(index, delta.x + slidePos[index], 0); translate(circle(index+1), delta.x + slidePos[circle(index+1)], 0); } else { delta.x = delta.x / ( (!index && delta.x > 0 // if first slide and sliding left || index == slides.length - 1 // or if last slide and sliding right && delta.x < 0 // and if sliding at all ) ? ( Math.abs(delta.x) / width + 1 ) // determine resistance level : 1 ); // no resistance if false // translate 1:1 translate(index-1, delta.x + slidePos[index-1], 0); translate(index, delta.x + slidePos[index], 0); translate(index+1, delta.x + slidePos[index+1], 0); } } }, end: function(event) { // measure duration var duration = +new Date - start.time; // determine if slide attempt triggers next/prev slide var isValidSlide = Number(duration) < 250 // if slide duration is less than 250ms && Math.abs(delta.x) > 20 // and if slide amt is greater than 20px || Math.abs(delta.x) > width/2; // or if slide amt is greater than half the width // determine if slide attempt is past start and end var isPastBounds = !index && delta.x > 0 // if first slide and slide amt is greater than 0 || index == slides.length - 1 && delta.x < 0; // or if last slide and slide amt is less than 0 if (options.continuous) isPastBounds = false; // determine direction of swipe (true:right, false:left) var direction = delta.x < 0; // if not scrolling vertically if (!isScrolling) { if (isValidSlide && !isPastBounds) { if (direction) { if (options.continuous) { // we need to get the next in this direction in place move(circle(index-1), -width, 0); move(circle(index+2), width, 0); } else { move(index-1, -width, 0); } move(index, slidePos[index]-width, speed); move(circle(index+1), slidePos[circle(index+1)]-width, speed); index = circle(index+1); } else { if (options.continuous) { // we need to get the next in this direction in place move(circle(index+1), width, 0); move(circle(index-2), -width, 0); } else { move(index+1, width, 0); } move(index, slidePos[index]+width, speed); move(circle(index-1), slidePos[circle(index-1)]+width, speed); index = circle(index-1); } options.callback && options.callback(index, slides[index]); } else { if (options.continuous) { move(circle(index-1), -width, speed); move(index, 0, speed); move(circle(index+1), width, speed); } else { move(index-1, -width, speed); move(index, 0, speed); move(index+1, width, speed); } } } // kill touchmove and touchend event listeners until touchstart called again element.removeEventListener('touchmove', events, false) element.removeEventListener('touchend', events, false) }, transitionEnd: function(event) { if (parseInt(event.target.getAttribute('data-index'), 10) == index) { if (delay) begin(); options.transitionEnd && options.transitionEnd.call(event, index, slides[index]); } } } // trigger setup setup(); // start auto slideshow if applicable if (delay) begin(); // add event listeners if (browser.addEventListener) { // set touchstart event on element if (browser.touch) element.addEventListener('touchstart', events, false); if (browser.transitions) { element.addEventListener('webkitTransitionEnd', events, false); element.addEventListener('msTransitionEnd', events, false); element.addEventListener('oTransitionEnd', events, false); element.addEventListener('otransitionend', events, false); element.addEventListener('transitionend', events, false); } // set resize event on window window.addEventListener('resize', events, false); } else { window.onresize = function () { setup() }; // to play nice with old IE } // expose the Swipe API return { setup: function() { setup(); }, slide: function(to, speed) { // cancel slideshow stop(); slide(to, speed); }, prev: function() { // cancel slideshow stop(); prev(); }, next: function() { // cancel slideshow stop(); next(); }, stop: function() { // cancel slideshow stop(); }, getPos: function() { // return current index position return index; }, getNumSlides: function() { // return total number of slides return length; }, kill: function() { // cancel slideshow stop(); // reset element element.style.width = ''; element.style.left = ''; // reset slides var pos = slides.length; while(pos--) { var slide = slides[pos]; slide.style.width = ''; slide.style.left = ''; if (browser.transitions) translate(pos, 0, 0); } // removed event listeners if (browser.addEventListener) { // remove current event listeners element.removeEventListener('touchstart', events, false); element.removeEventListener('webkitTransitionEnd', events, false); element.removeEventListener('msTransitionEnd', events, false); element.removeEventListener('oTransitionEnd', events, false); element.removeEventListener('otransitionend', events, false); element.removeEventListener('transitionend', events, false); window.removeEventListener('resize', events, false); } else { window.onresize = null; } } } } if ( window.jQuery || window.Zepto ) { (function($) { $.fn.Swipe = function(params) { return this.each(function() { $(this).data('Swipe', new Swipe($(this)[0], params)); }); } })( window.jQuery || window.Zepto ) }
接着再将使用方法放上来
<!DOCTYPE HTML> <html> <head> <title>Swipe 2</title> <meta http-equiv="X-UA-Compatible" content="IE=8"> <meta name='viewport' content='width=device-width, initial-scale=1.0, maximum-scale=1.0'/> <style> /* Swipe 2 required styles */ .swipe { overflow: hidden; visibility: hidden; position: relative; } .swipe-wrap { overflow: hidden; position: relative; } .swipe-wrap > div { float:left; width:100%; position: relative; } .swipe-wrap > div a img{width:100%; height:180px;border:0px;} /* END required styles */ </style> </head> <body> <div id='mySwipe' style='width:100%; height:180px;' class='swipe'> <div class='swipe-wrap'> <div><a href=""><img src="images/1.png" /></a></div> <div><a href=""><img src="images/2.png" /></a></div> <div><a href=""><img src="images/3.png" /></a></div> <div><a href=""><img src="images/4.png" /></a></div> </div> </div> <div style='text-align:center;padding-top:20px;'> <button onclick='mySwipe.prev()'>prev</button> <button onclick='mySwipe.next()'>next</button> </div> <script src="jquery-1.9.1.min.js" type="text/javascript"></script> <script src='swipe.js'></script> <script> // pure JS var elem = document.getElementById('mySwipe'); window.mySwipe = Swipe(elem, { startSlide: 0, auto: 3000, // continuous: true, disableScroll: true, // stopPropagation: true, callback: function(index, element) { console.log(index); }, // transitionEnd: function(index, element) {} }); // with jQuery // window.mySwipe = $('#mySwipe').Swipe().data('Swipe'); </script>
