插件特色:支持zepto库 支持时间戳格式 支持年月日时分秒格式
countdown 由jquery依赖库改成zepto
zepto的event机制与jquery不同,所以更换之后代码不能正常运行
这里对event机制做下探讨
事件是用来描述网页中某一特定有趣时刻的,众所周知事件通常是在由用户和浏览器进行交互时触发,其实不然,通过Javascript可以在任何时间触发特定的事件,并且这些事件与浏览器创建的事件是相同的。这就意味着会有适当的事件冒泡,并且浏览器会执行分配的事件处理程序。这种能力在测试web应用程序的时候,是非常有用的,在DOM 3级规范中提供了方法来模拟特定的事件,IE9 chrome FF Opera 和 Safari都支持这样的方式,在IE8及以前的办法的IE浏览器有他自己的方式来模拟事件
a)Dom 事件模拟
可以通过document上的createEvent()方法,在任何时候创建事件对象,此方法只接受一个参数,既要创建事件对象的事件字符串,在DOM2 级规范上所有的字符串都是复数形式,在DOM 3级事件上所有的字符串都采用单数形式,所有的字符串如下:
UIEvents:通用的UI 事件,鼠标事件键盘事件都是继承自UI事件,在DOM 3 级上使用的是 UIEvent。
MouseEvents:通用的鼠标事件,在DOM 3 级上使用的是 MouseEvent。
MutationEvents:通用的突变事件,在DOM 3 级上使用的是 MutationEvent。
HTMLEvents:通用的HTML事件,在DOM3级上还没有等效的。
注意,ie9是唯一支持DOM3级键盘事件的浏览器,但其他浏览器也提供了其他可用的方法来模拟键盘事件。
一旦创建了一个事件对象,就要初始化这个事件的相关信息,每一种类型的事件都有特定的方法来初始化,在创建完事件对象之后,通过dispatchEvent()方法来将事件应用到特定的dom节点上,以便其支持该事件。这个dispatchEvent()事件,支持一个参数,就是你创建的event对象。
对于HTML事件,直接上代码。
var event = document.createEvent(“HTMLEvents”);
event.initEvent(“focus”, true, false);
target.dispatchEvent(event);
插件源码地址:
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
; (function(factory) { if (typeof define === 'function' && define.amd) { define(['Zepto'], factory); } else { factory(Zepto); } })(function($) { var PRECISION = 1000; // 0.1 seconds, used to update the DOM var instances = [], matchers = []; // Miliseconds // matchers.push(/^[0-9]*$/.source); matchers.push(/^[0-9]*$/.source); // Month/Day/Year [hours:minutes:seconds // matchers.push(/([0-9]{1,2}/){2}[0-9]{4}( [0-9]{1,2}(:[0-9]{2}){2})?/.source); matchers.push(/([0-9]{1,2}/){2}[0-9]{4}( [0-9]{1,2}(:[0-9]{2}){2})?/.source); // Year/Day/Month [hours:minutes:seconds // matchers.push(/[0-9]{4}(/[0-9]{1,2}){2}( [0-9]{1,2}(:[0-9]{2}){2})?/.source); matchers.push(/[0-9]{4}([/-][0-9]{1,2}){2}( [0-9]{1,2}(:[0-9]{2}){2})?/.source); // Cast the matchers to a regular expression object matchers.push(/^[0-9]*$/.source); matchers.push(/([0-9]{1,2}/){2}[0-9]{4}( [0-9]{1,2}(:[0-9]{2}){2})?/.source); matchers.push(/[0-9]{4}([/-][0-9]{1,2}){2}( [0-9]{1,2}(:[0-9]{2}){2})?/.source); matchers = new RegExp(matchers.join("|")); // Parse a Date formatted has String to a native object function parseDateString(dateString) { // Pass through when a native object is sent if (dateString instanceof Date) { return dateString; } // Caste string to date object if (String(dateString).match(matchers)) { // If looks like a milisecond value cast to number before // final casting (Thanks to @msigley) if (String(dateString).match(/^[0-9]*$/)) { dateString = Number(dateString); } if (String(dateString).match(/-/)) { dateString = String(dateString).replace(/-/g, "/"); } // return new Date(dateString); return new Date(dateString); } else { throw new Error("Couldn't cast `" + dateString + "` to a date object."); } } var DIRECTIVE_KEY_MAP = { 'Y': 'years', 'm': 'months', 'w': 'weeks', 'd': 'days', 'D': 'totalDays', 'H': 'hours', 'M': 'minutes', 'S': 'seconds' }; // Time string formatter function strftime(offsetObject) { // console.log(offsetObject) return function(format) { // console.log(format) var directives = format.match(/%(-|!)?[A-Z]{1}(:[^;]+;)?/gi); if (directives) { for (var i = 0, len = directives.length; i < len; ++i) { var directive = directives[i] .match(/%(-|!)?([a-zA-Z]{1})(:[^;]+;)?/), regexp = new RegExp(directive[0]), modifier = directive[1] || '', plural = directive[3] || '', value = null; // Get the key directive = directive[2]; // Swap shot-versions directives if (DIRECTIVE_KEY_MAP.hasOwnProperty(directive)) { value = DIRECTIVE_KEY_MAP[directive]; value = Number(offsetObject[value]); } if (value !== null) { // Pluralize if (modifier === '!') { value = pluralize(plural, value); } // Add zero-padding if (modifier === '') { if (value < 10) { value = '0' + value.toString(); } } // Replace the directive format = format.replace(regexp, value.toString()); } } } format = format.replace(/%%/, '%'); return format; }; } // Pluralize function pluralize(format, count) { var plural = 's', singular = ''; if (format) { format = format.replace(/(:|;|s)/gi, '').split(/\,/); if (format.length === 1) { plural = format[0]; } else { singular = format[0]; plural = format[1]; } } if (Math.abs(count) === 1) { return singular; } else { return plural; } } function fireEvent(el, type, extra) { var ev = document.createEvent("HTMLEvents"); // console.log(type); ev.initEvent(type, true, true) for (var key in extra) { ev[key] = extra[key] console.log(extra[key]) } el.dispatchEvent(ev); // console.log(el); } $.fn.On = function(name, cb) { if ($ == Zepto) { this.get(0).addEventListener(name, cb); } else { this.$el.on(name, callback); } } // The Final Countdown var Countdown = function(el, finalDate, callback) { this.el = el; this.$el = $(el); this.interval = null; this.offset = {}; // Set the final date this.setFinalDate(finalDate); // Register this instance this.instanceNumber = instances.length; instances.push(this); // Save the reference this.$el.data('countdown-instance', this.instanceNumber); // Register the callbacks when supplied if (callback) { this.$el.On('update.countdown', callback); this.$el.On('stoped.countdown', callback); this.$el.On('finish.countdown', callback); } this.start(); }; Countdown.prototype.start = function() { if (this.interval !== null) { throw new Error("Countdown is already running!"); } var self = this; this.update(); this.interval = setInterval(function() { self.update.call(self); }, PRECISION); }; Countdown.prototype.stop = function() { clearInterval(this.interval); this.interval = null; this.dispatchEvent('stoped'); }; Countdown.prototype.pause = function() { this.stop.call(this); }; Countdown.prototype.resume = function() { this.start.call(this); }; Countdown.prototype.remove = function() { this.stop(); delete instances[this.instanceNumber]; }; Countdown.prototype.setFinalDate = function(value) { this.finalDate = parseDateString(value); // Cast the given date }; Countdown.prototype.update = function() { // Stop if dom is not in the html (Thanks to @dleavitt) if (this.$el.closest('html').length === 0) { this.remove(); return; } // Calculate the remaining time this.totalSecsLeft = this.finalDate.valueOf() - new Date().valueOf(); // In miliseconds this.totalSecsLeft = Math.ceil(this.totalSecsLeft / 1000); this.totalSecsLeft = this.totalSecsLeft < 0 ? 0 : this.totalSecsLeft; // Calculate the offsets this.offset = { seconds: this.totalSecsLeft % 60, minutes: Math.floor(this.totalSecsLeft / 60) % 60, hours: Math.floor(this.totalSecsLeft / 60 / 60) % 24, days: Math.floor(this.totalSecsLeft / 60 / 60 / 24) % 7, totalDays: Math.floor(this.totalSecsLeft / 60 / 60 / 24), weeks: Math.floor(this.totalSecsLeft / 60 / 60 / 24 / 7), months: Math.floor(this.totalSecsLeft / 60 / 60 / 24 / 30), years: Math.floor(this.totalSecsLeft / 60 / 60 / 24 / 365) }; // Dispatch an event if (this.totalSecsLeft === 0) { this.stop(); this.dispatchEvent('finish'); } else { this.dispatchEvent('update'); } }; Countdown.prototype.dispatchEvent = function(eventName) { var event = {}; //$.Event(eventName + '.countdown'); event.finalDate = this.finalDate; event.offset = $.extend({}, this.offset); event.strftime = strftime(this.offset); if ($ == Zepto) { // console.log(eventName) fireEvent(this.$el.get(0), eventName + '.countdown', event); } else { this.$el.trigger(event); } // console.log(this) // console.log(event); }; // Register the jQuery selector actions $.fn.countdown = function() { var argumentsArray = Array.prototype.slice.call(arguments, 0); // console.log(argumentsArray[1]) return this.each(function() { var instanceNumber = $(this).data('countdown-instance'); // console.log(instanceNumber+'agd') // Verify if we already have a countdown for this node ... if (instanceNumber) { var instance = instances[instanceNumber], method = argumentsArray[0]; // If method exists in the prototype execute if (Countdown.prototype.hasOwnProperty(method)) { instance[method].apply(instance, argumentsArray.slice(1)); // If method look like a date try to set a new final date } else if (String(method).match(/^[$A-Z_][0-9A-Z_$]*$/i) === null) { instance.setFinalDate.call(instance, method); } else { $.error('Method %s does not exist on jQuery.countdown'.replace(/\%s/gi, method)); } } else { // ... if not we create an instance new Countdown(this, argumentsArray[0], argumentsArray[1]); } }); }; });
参考文档 http://www.cnblogs.com/MrBackKom/archive/2012/06/26/2564501.html