Open mominger opened 9 years ago
// Zepto.js // (c) 2010-2015 Thomas Fuchs // Zepto.js may be freely distributed under the MIT license. ;(function($, undefined){ var prefix = '', eventPrefix, // prefix浏览器前缀 -webkit等，eventPrefix事件前缀 vendors = { Webkit: 'webkit', Moz: '', O: 'o' }, //前缀数据源 不包含IE testEl = document.createElement('div'), //临时DIV容器 supportedTransforms = /^((translate|rotate|scale)(X|Y|Z|3d)?|matrix(3d)?|perspective|skew(X|Y)?)$/i, //变形检测 transform, //变形 transitionProperty, transitionDuration, transitionTiming, transitionDelay,//过渡 animationName, animationDuration, animationTiming, animationDelay, //动画 cssReset = {} //将驼峰字符串转成css属性，如aB-->a-b function dasherize(str) { return str.replace(/([a-z])([A-Z])/, '$1-$2').toLowerCase() } //修正事件名 function normalizeEvent(name) { return eventPrefix ? eventPrefix + name : name.toLowerCase() } /** * 根据浏览器内核，设置CSS前缀，事件前缀 * 如-webkit， css：-webkit- event:webkit * 这里会在vendors存储webkit，moz，o三种前缀 */ $.each(vendors, function(vendor, event){ if (testEl.style[vendor + 'TransitionProperty'] !== undefined) { prefix = '-' + vendor.toLowerCase() + '-' eventPrefix = event return false } }) transform = prefix + 'transform' //变形 //过渡 cssReset[transitionProperty = prefix + 'transition-property'] = cssReset[transitionDuration = prefix + 'transition-duration'] = cssReset[transitionDelay = prefix + 'transition-delay'] = cssReset[transitionTiming = prefix + 'transition-timing-function'] = cssReset[animationName = prefix + 'animation-name'] = cssReset[animationDuration = prefix + 'animation-duration'] = cssReset[animationDelay = prefix + 'animation-delay'] = cssReset[animationTiming = prefix + 'animation-timing-function'] = '' /** * 动画常量数据源 * @type {{off: boolean, speeds: {_default: number, fast: number, slow: number}, cssPrefix: string, transitionEnd: *, animationEnd: *}} */ $.fx = { off: (eventPrefix === undefined && testEl.style.transitionProperty === undefined), //能力检测是否支持动画，具体检测是否支持过渡，支持过渡事件 speeds: { _default: 400, fast: 200, slow: 600 }, cssPrefix: prefix, //css 前缀 如-webkit- transitionEnd: normalizeEvent('TransitionEnd'), //过渡结束事件 animationEnd: normalizeEvent('AnimationEnd') //动画播放结束事件 } /** * 创建自定义动画 * @param properties 样式集 * @param duration 持续事件 * @param ease 速率 * @param callback 完成时的回调 * @param delay 动画延迟 * @returns {*} */ $.fn.animate = function(properties, duration, ease, callback, delay){ //参数修正，传参为function(properties,callback) if ($.isFunction(duration)) callback = duration, ease = undefined, duration = undefined if ($.isFunction(ease)) //传参为function(properties,duration，callback) callback = ease, ease = undefined if ($.isPlainObject(duration)) //传参为function(properties,｛｝) ease = duration.easing, callback = duration.complete, delay = duration.delay, duration = duration.duration // duration 数字：持续时间 字符串：取speeds: { _default: 400, fast: 200, slow: 600 }对应数字 if (duration) duration = (typeof duration == 'number' ? duration : ($.fx.speeds[duration] || $.fx.speeds._default)) / 1000 //动画持续时间默认值 if (delay) delay = parseFloat(delay) / 1000 //延迟时间，除以1000转换成s return this.anim(properties, duration, ease, callback, delay) } /** * 动画核心方法 * @param properties 样式集 * @param duration 持续事件 * @param ease 速率 * @param callback 完成时的回调 * @param delay 动画延迟 * @returns {*} */ $.fn.anim = function(properties, duration, ease, callback, delay){ var key, cssValues = {}, cssProperties, transforms = '', // transforms 变形 cssValues设置给DOM的样式 that = this, wrappedCallback, endEvent = $.fx.transitionEnd, fired = false //修正持续时间 if (duration === undefined) duration = $.fx.speeds._default / 1000 if (delay === undefined) delay = 0 //如果浏览器不支持动画，持续时间设为0，直接跳动画结束 if ($.fx.off) duration = 0 // properties是动画名 if (typeof properties == 'string') { // keyframe animation cssValues[animationName] = properties cssValues[animationDuration] = duration + 's' cssValues[animationDelay] = delay + 's' cssValues[animationTiming] = (ease || 'linear') endEvent = $.fx.animationEnd //动画结束事件 } else { //properties 是样式集 cssProperties = [] // CSS transitions for (key in properties) //supportedTransforms.test(key) 正则检测是否为变形 //key + '(' + properties[key] + ') ' 拼凑成变形方法 if (supportedTransforms.test(key)) transforms += key + '(' + properties[key] + ') ' else cssValues[key] = properties[key], cssProperties.push(dasherize(key)) //变形统一存入 cssValues cssProperties if (transforms) cssValues[transform] = transforms, cssProperties.push(transform) // duration > 0可以播放动画，且properties是对象，表明为过渡，上面有字符串，则为animate if (duration > 0 && typeof properties === 'object') { cssValues[transitionProperty] = cssProperties.join(', ') cssValues[transitionDuration] = duration + 's' cssValues[transitionDelay] = delay + 's' cssValues[transitionTiming] = (ease || 'linear') //默认线性速率 } } //动画完成后的响应函数 wrappedCallback = function(event){ if (typeof event !== 'undefined') { if (event.target !== event.currentTarget) return // makes sure the event didn't bubble from "below" $(event.target).unbind(endEvent, wrappedCallback) } else $(this).unbind(endEvent, wrappedCallback) // triggered by setTimeout fired = true $(this).css(cssReset) callback && callback.call(this) } //处理动画结束事件 if (duration > 0){ //绑定动画结束事件 this.bind(endEvent, wrappedCallback) // transitionEnd is not always firing on older Android phones // so make sure it gets fired //延时ms后执行动画，注意这里加了25ms，保持endEvent，动画先执行完。 //绑定过事件还做延时处理，是transitionEnd在older Android phones不一定触发 setTimeout(function(){ //如果触发过，就不处理 if (fired) return wrappedCallback.call(that) }, ((duration + delay) * 1000) + 25) } // trigger page reflow so new elements can animate //主动触发页面回流，刷新DOM，让接下来设置的动画可以正确播放 //更改 offsetTop、offsetLeft、 offsetWidth、offsetHeight；scrollTop、scrollLeft、scrollWidth、scrollHeight；clientTop、clientLeft、clientWidth、clientHeight；getComputedStyle() 、currentStyle（）。这些都会触发回流。回流导致DOM重新渲染，平时要尽可能避免，但这里，为了动画即时生效播放，则主动触发回流，刷新DOM。 this.size() && this.get(0).clientLeft //设置样式，启动动画 this.css(cssValues) // duration为0，即浏览器不支持动画的情况，直接执行动画结束，执行回调。 if (duration <= 0) setTimeout(function() { that.each(function(){ wrappedCallback.call(this) }) }, 0) return this } testEl = null //去掉不必要的数据存储，便于垃圾回收 })(Zepto)
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