移动web：翻页场景动画
在移动web，特别是在微信中，经常看到一种翻页动画效果，也称为场景动画。
一页一页的翻过，像在看书，每页的内容以各种"炫酷"的效果出现在你的眼里，配上一首动听的音乐，你有没有喜欢上呢。
这里没有音乐，没有炫酷的出场，只有实实在在的翻页。
先看看效果（如果不能查看 复制下面的代码保存在本地查看 或者在移动设备查看本页面）
先贴上代码，仅供参考
/** * LBS slidePage 绝对定位方式 支持WP * Date: 2014-11-20 * =================================================== * opts.el 外围包裹容器/滑动事件对象(一个字符串的CSS选择器或者元素对象) * opts.index 索引(默认0) 指定显示哪个索引的页 * opts.current 当前页添加的类名(默认'current') * opts.navShow 是否需要导航指示 默认false不需要 * opts.navClass 导航指示容器的类名 方便设置样式 (默认'slide-nav') * opts.auto 是否自动播放 默认false * opts.delay 自动播放间隔时间 默认5000(单位毫秒) 自动播放时有效 * opts.locked 是否锁定头尾滑动 默认false 如果开启则不能使用自动播放 * opts.effect 动画效果(平移=translate 缩放=scale 重叠=overlap) 默认平移 * opts.duration 动画持续时间 默认300(单位毫秒) * opts.minScale 动画效果为缩放时的最小缩放比率(0 ~ 1) 1为没有缩放效果 默认0.5 * opts.start 手指按下时 执行函数 * opts.move 手指移动中 执行函数 * opts.end 手指收起后 执行函数 * =================================================== * this.box 包裹页的容器对象 * this.index 当前索引 * this.length 有多少页 最后一页的索引为 this.length-1 * this.play 调用自动播放的方法 * this.stop 清除自动播放的方法 * this.up 手动调用向上滑动翻页的方法 方便增加点击按钮时调用 * this.down 手动调用向下滑动翻页的方法 * =================================================== **/ ;(function() { window.slidePage = function(opts) { opts = opts || {}; if (opts.el === undefined) return; this.box = typeof opts.el === 'string' ? document.querySelector(opts.el) : opts.el; this.pages = this.box.children; this.length = this.pages.length; if (this.length < 1) return; if (opts.index > this.length - 1) opts.index = 0; this.body = document.getElementsByTagName('body')[0]; this.nav = null; this.navs = []; this.navShow = !!opts.navShow || false; this.navClass = opts.navClass || 'slide-nav'; this.index = this.oIndex = opts.index || 0; this.current = opts.current || 'current'; this.locked = !!opts.locked || false; this.auto = !!opts.auto || false; this.auto && (this.delay = opts.delay || 5000); this.effect = opts.effect || 'translate'; this.duration = opts.duration || 300; this.minScale = opts.minScale || 0.5; this.start = opts.start || function() {}; this.move = opts.move || function() {}; this.end = opts.end || function() {}; this.timer = null; this.animated = true; this.touch = {}; this.point = ''; this.init(); }; slidePage.prototype = { init: function() { this.navShow && this.createNav(); this.initSet(); this.bind(); }, createNav: function() { var li = null, i = 0; this.nav = document.createElement('ul'); for (; i < this.length; i++) { li = document.createElement('li'); this.navs.push(li); this.nav.appendChild(li); } this.nav.className = this.navClass; this.body.appendChild(this.nav); }, initSet: function() { this.height = document.documentElement.clientHeight || document.body.clientHeight; if (this.css(this.box, 'position') !== 'absolute' || this.css(this.box, 'position') !== 'relative') this.box.style.position = 'relative'; if (this.css(this.box, 'overflow') !== 'hidden') this.box.style.overflow = 'hidden'; this.box.style.height = this.height + 'px'; for (var i = 0; i < this.length; i++) { if (this.css(this.pages[i], 'display') !== 'none') this.pages[i].style.display = 'none'; if (this.css(this.pages[i], 'position') !== 'absolute') this.pages[i].style.position = 'absolute'; this.pages[i].style.height = this.height + 'px'; } if (this.navShow) { this.nav.style.marginTop = -this.nav.offsetHeight / 2 + 'px'; this.navs[this.index].className = this.current; } this.pages[this.index].className += ' ' + this.current; this.zIndex = parseInt(this.css(this.pages[this.index], 'zIndex') === 'auto' ? 1 : this.css(this.pages[this.index], zIndex)) + 10; this.pages[this.index].style.display = 'block'; }, bind: function() { var _this = this; this.on(this.box, ['touchstart', 'pointerdown', 'mousedown'], function(e) { _this.touchStart(e); _this.auto && _this.stop(); }); this.on(this.box, ['touchmove', 'pointermove', 'mousemove'], function(e) { _this.touchMove(e); _this.auto && _this.stop(); }); this.on(this.box, ['touchend', 'touchcancel', 'pointerup', 'mouseup'], function(e) { _this.touchEnd(e); _this.auto && _this.play(); }); }, touchStart: function(e) { this.point = e.type.indexOf('down') < 0 ? 'touch' : 'pointer'; if (this.point === 'pointer') { this.touch.x = e.pageX; this.touch.y = e.pageY; }else if (this.point === 'touch') { this.touch.x = e.touches[0].pageX; this.touch.y = e.touches[0].pageY; } this.touch.disX = 0; this.touch.disY = 0; this.touch.fixed = ''; this.start && this.start(); }, touchMove: function(e) { e.stopPropagation(); e.preventDefault(); if (this.point === '') return; if (this.touch.fixed === 'left') return; if (!this.animated) return; if (this.point === 'pointer') { this.touch.disX = e.pageX - this.touch.x; this.touch.disY = e.pageY - this.touch.y; }else if (this.point === 'touch') { if (e.touches.length > 1) return; this.touch.disX = e.touches[0].pageX - this.touch.x; this.touch.disY = e.touches[0].pageY - this.touch.y; } if (this.touch.fixed === '') { if (Math.abs(this.touch.disY) > Math.abs(this.touch.disX)) { this.touch.fixed = 'up'; } else { this.touch.fixed = 'left'; } } if (this.touch.fixed === 'up') { if (this.effect === 'scale') { this.scale = ((this.height - Math.abs(this.touch.disY)) / this.height).toFixed(3); this.scale < this.minScale && (this.scale = this.minScale); } if (this.touch.disY > 0) { if (this.locked && this.oIndex === 0) return; this.dis = -this.height; this.index = this.oIndex - 1; this.index < 0 && (this.index = this.length - 1); if (this.effect === 'scale') this.setOrigin(this.oIndex, 'center bottom'); } else { if (this.locked && this.oIndex === this.length - 1) return; this.dis = this.height; this.index = this.oIndex + 1; this.index > this.length - 1 && (this.index = 0); if (this.effect === 'scale') this.setOrigin(this.oIndex, 'center top'); } if (this.nIndex !== undefined && this.nIndex !== this.index && this.nIndex !== this.oIndex) { this.pages[this.nIndex].style.display = 'none'; this.pages[this.nIndex].style.zIndex = ''; this.pages[this.nIndex].style.webkitTransform = this.pages[this.nIndex].style.transform = ''; } this.nIndex = this.index; this.pages[this.oIndex].style.zIndex = this.zIndex; this.pages[this.index].style.zIndex = this.zIndex + 10; this.setTransform(this.index, this.dis); this.pages[this.index].style.display = 'block'; this.setTransform(this.index, this.touch.disY + this.dis); if (this.effect === 'translate') this.setTransform(this.oIndex, this.touch.disY); if (this.effect === 'scale') this.setScale(this.oIndex, this.scale); this.move && this.move(); } }, touchEnd: function(e) { this.point = ''; if (this.index === this.oIndex) return; if (this.touch.fixed === 'up') { var Y = Math.abs(this.touch.disY); if ((this.animated && Y > 10) || Y > this.height / 2) { this.slide(); } else { this.goback(); } this.end && this.end(); } }, css: function(o, n) { return getComputedStyle(o, null)[n]; }, on: function(el, types, handler) { for (var i = 0, l = types.length; i < l; i++) el.addEventListener(types[i], handler, false); }, setScale: function(index, v) { this.setStyle(this.pages[index], 'transform', 'scale(' + v + ')'); }, setOrigin: function(index, dir) { this.setStyle(this.pages[index], 'transform-origin', dir); }, setTransform: function(index, v) { this.setStyle(this.pages[index], 'transform', 'translate3d(0,' + v + 'px,0)'); }, setTransition: function(index, v) { this.setStyle(this.pages[index], 'transition', 'all ' + v + 'ms'); }, setStyle: function(el, p, v) { var prefix = ['o', 'moz', 'ms', 'webkit', ''], i = 0, l = prefix.length; for (; i < l; i++) { (function(i) { var s = prefix[i] + '-' + p; s = s.replace(/-\D/g, function(match) { return match.charAt(1).toUpperCase(); }); el.style[s] = v; }(i)); } }, slide: function() { var _this = this; this.animated = false; this.setTransition(this.index, this.duration); this.setTransition(this.oIndex, this.duration); this.setTransform(this.index, 0); if (this.effect === 'translate') this.setTransform(this.oIndex, -this.dis); if (this.effect === 'scale') this.setScale(this.oIndex, this.minScale); setTimeout(function() { if (_this.index !== _this.oIndex) _this.update(); _this.animated = true; }, this.duration); }, goback: function() { var _this = this; this.setTransition(this.index, 100); this.setTransition(this.oIndex, 100); this.setTransform(this.index, this.dis); if (this.effect === 'translate') this.setTransform(this.oIndex, 0); if (this.effect === 'scale') this.setScale(this.oIndex, 1); setTimeout(function() { _this.clear(); _this.pages[_this.index].style.display = 'none'; _this.index = _this.oIndex; }, 100); }, update: function() { if (this.navShow) { this.navs[this.index].className = this.current; this.navs[this.oIndex].className = ''; } this.pages[this.oIndex].style.display = 'none'; this.pages[this.index].className += ' ' + this.current; this.pages[this.oIndex].className = this.pages[this.oIndex].className.replace(this.current, '').trim(); this.clear(); this.oIndex = this.index; }, clear: function() { this.pages[this.index].style.webkitTransition = this.pages[this.index].transition = ''; this.pages[this.oIndex].style.webkitTransition = this.pages[this.oIndex].transition = ''; this.pages[this.index].style.webkitTransform = this.pages[this.index].style.transform = ''; this.pages[this.oIndex].style.webkitTransform = this.pages[this.oIndex].style.transform = ''; this.pages[this.oIndex].style.zIndex = ''; this.pages[this.index].style.zIndex = ''; if (this.effect === 'scale') this.setOrigin(this.oIndex, ''); }, animate: function() { var _this = this; this.setTransform(this.index, this.dis); this.pages[this.index].style.display = 'block'; this.pages[this.oIndex].style.zIndex = this.zIndex; this.pages[this.index].style.zIndex = this.zIndex + 10; this.setTransition(this.index, 0); this.setTransition(this.oIndex, 0); setTimeout(function() { _this.slide(); }, 50); }, up: function() { this.dis = this.height; this.index++; this.index > this.length - 1 && (this.index = 0); if (this.effect === 'scale') this.setOrigin(this.oIndex, 'center top'); this.animate(); }, down: function() { this.dis = -this.height; this.index--; this.index < 0 && (this.index = this.length - 1); if (this.effect === 'scale') this.setOrigin(this.oIndex, 'center bottom'); this.animate(); }, play: function() { var _this = this; if (this.locked) return; this.timer = setInterval(function() { _this.up(); }, this.delay); }, stop: function() { this.timer && clearInterval(this.timer); this.timer = null; } }; }());
和以前写的 图片切换 有许多共同的地方，整个翻页和图片切换原理都是类似的。
这个支持自动播放，三种翻页效果，限制头尾滑动等。
翻页动画，就是在一个容器内滑动，在这个容器中每次只显示一页，每一页都有一些css3动画效果的元素出现。
一个简单的HTML结构如下：
<div id="slidePageBox" class="slide-box"> <section class="slide-page page1"> <!-- 1 --> </section> <section class="slide-page page2"> <!-- 2 --> </section> <section class="slide-page page3"> <!-- 3 --> </section> <section class="slide-page page4"> <!-- 4 --> </section> <section class="slide-page page5"> <!-- 5 --> </section> </div>
类名为slide-box的div标签就是容器，类名为slide-page的section标签就是每个要翻的页。
this.box = typeof opts.el === 'string' ? document.querySelector(opts.el) : opts.el; this.pages = this.box.children; this.length = this.pages.length;
这里this.box就是容器，this.pages就是所有要翻的页。
this.height = document.documentElement.clientHeight; this.box.style.height = this.height + 'px'; for (var i = 0; i < this.length; i++) { //.. this.pages[i].style.height = this.height + 'px'; }
获取浏览器窗口的高，并设置容器和页的高为这个值。这个翻页是上下滑动，JS就没有获取宽度值了。
容器宽用css设置为width:100%，做个最大宽度限制为max-width:640px，这可根据实际情况设置。
现在切换翻页，当手指在容器滑动时，这里为判断上下滑动，满足滑动一定距离，手指离开容器时，开始翻页。
触摸事件：手指移入，手指移动，手指离开
指针事件：指针按下，指针移动，指针收起
鼠标事件: 鼠标按下，鼠标移动，鼠标收起
//.. bind: function() { var _this = this; this.on(this.box, ['touchstart', 'pointerdown', 'mousedown'], function(e) { _this.touchStart(e); //.. }); this.on(this.box, ['touchmove', 'pointermove', 'mousemove'], function(e) { _this.touchMove(e); //.. }); this.on(this.box, ['touchend', 'touchcancel', 'pointerup', 'mouseup'], function(e) { _this.touchEnd(e); //.. }); }, //..
绑定了触摸事件，WP的指针事件，鼠标事件。
//.. touchStart: function(e) { this.point = e.type.indexOf('down') < 0 ? 'touch' : 'pointer'; if (this.point === 'pointer') { this.touch.x = e.pageX; this.touch.y = e.pageY; }else if (this.point === 'touch') { this.touch.x = e.touches[0].pageX; this.touch.y = e.touches[0].pageY; } //.. }, //..
获取移入时的初始位置（触摸，指针，鼠标）
//.. touchMove: function(e) { //.. if (this.touch.fixed === 'left') return; //.. if (this.point === 'pointer') { this.touch.disX = e.pageX - this.touch.x; this.touch.disY = e.pageY - this.touch.y; }else if (this.point === 'touch') { //.. this.touch.disX = e.touches[0].pageX - this.touch.x; this.touch.disY = e.touches[0].pageY - this.touch.y; } if (this.touch.fixed === '') { if (Math.abs(this.touch.disY) > Math.abs(this.touch.disX)) { this.touch.fixed = 'up'; } else { this.touch.fixed = 'left'; } } if (this.touch.fixed === 'up') { //.. } }, //..
移动时（触摸，指针，鼠标）获取移动了多少距离，根据距离判断向左右还是上下移动的，这里翻页只要上下移动。
//.. if (this.touch.fixed === 'up') { if (this.effect === 'scale') { this.scale = ((this.height - Math.abs(this.touch.disY)) / this.height).toFixed(3); this.scale < this.minScale && (this.scale = this.minScale); } if (this.touch.disY > 0) { if (this.locked && this.oIndex === 0) return; this.dis = -this.height; this.index = this.oIndex - 1; this.index < 0 && (this.index = this.length - 1); if (this.effect === 'scale') this.setOrigin(this.oIndex, 'center bottom'); } else { if (this.locked && this.oIndex === this.length - 1) return; this.dis = this.height; this.index = this.oIndex + 1; this.index > this.length - 1 && (this.index = 0); if (this.effect === 'scale') this.setOrigin(this.oIndex, 'center top'); } if (this.nIndex !== undefined && this.nIndex !== this.index && this.nIndex !== this.oIndex) { this.pages[this.nIndex].style.display = 'none'; this.pages[this.nIndex].style.zIndex = ''; this.pages[this.nIndex].style.webkitTransform = this.pages[this.nIndex].style.transform = ''; } this.nIndex = this.index; this.pages[this.oIndex].style.zIndex = this.zIndex; this.pages[this.index].style.zIndex = this.zIndex + 10; this.setTransform(this.index, this.dis); this.pages[this.index].style.display = 'block'; this.setTransform(this.index, this.touch.disY + this.dis); if (this.effect === 'translate') this.setTransform(this.oIndex, this.touch.disY); if (this.effect === 'scale') this.setScale(this.oIndex, this.scale); this.move && this.move(); } //..
移动中做了很多事情，是整个程序比较重要的部分。在上下移动时，当前显示的页跟着移动，向上移动时，下一页显示出来一部分，向下移动时，上一页显示一部分。
如果锁定了头尾，第一页向下移动时不能移动，同样最后一页向上移动时不能移动。
opts.effect 动画效果(平移=translate 缩放=scale 重叠=overlap) 默认平移
根据每种翻页效果做初始化设置(如果只需要简单的平移切换可以省去很多代码)。
//.. touchEnd: function(e) { this.point = ''; if (this.index === this.oIndex) return; if (this.touch.fixed === 'up') { var Y = Math.abs(this.touch.disY); if ((this.animated && Y > 10) || Y > this.height / 2) { this.slide(); } else { this.goback(); } //.. } }, //..
离开时（触摸，指针，鼠标）根据条件执行滑动切换。
//.. slide: function() { var _this = this; this.animated = false; this.setTransition(this.index, this.duration); this.setTransition(this.oIndex, this.duration); this.setTransform(this.index, 0); if (this.effect === 'translate') this.setTransform(this.oIndex, -this.dis); if (this.effect === 'scale') this.setScale(this.oIndex, this.minScale); setTimeout(function() { if (_this.index !== _this.oIndex) _this.update(); _this.animated = true; }, this.duration); }, //..
滑动切换完成时会更新一些设置，比如为当前页增加当前标志类名。每页的css3动画元素也就可以根据这个类名执行动画效果。
//.. update: function() { if (this.navShow) { this.navs[this.index].className = this.current; this.navs[this.oIndex].className = ''; } this.pages[this.oIndex].style.display = 'none'; this.pages[this.index].className += ' ' + this.current; this.pages[this.oIndex].className = this.pages[this.oIndex].className.replace(this.current, '').trim(); this.clear(); this.oIndex = this.index; }, //..
切换了页，执行了每页的动画，整个场景动画就差不多完成了。
最后就是一些简单的了，自动播放什么的。
好了，到此结束。
---------------- 补充 ------------------------
为了兼容各大浏览器，css3动画属性前缀值得注意。
//.. setStyle: function(el, p, v) { !this.cache[el] && (this.cache[el] = {}); !this.cache[el][p] && (this.cache[el][p] = this.prefix(p)); el.style[this.cache[el][p] || this.prefix(p)] = v; }, prefix: function(p) { var style = document.createElement('div').style; if (p in style) return p; var prefix = ['webkit', 'Moz', 'ms', 'O'], i = 0, l = prefix.length, s = ''; for (; i < l; i++) { s = prefix[i] + '-' + p; s = s.replace(/-\D/g, function(match) { return match.charAt(1).toUpperCase(); }); if (s in style) return s; } }, //..
这里做了PC端查看兼容，注意IE的pointer移动事件会有个很有意思的表现，移动端的程序还是在移动设备中查看比较好。
