如何用jQuery和CSS3制作数字时钟[译]

zhuizhuizhui

2013-06-20

关注关注

这要从上周开始说起，当我看到漂亮的 dribbble 截图，就立刻感觉到一种要将其转变为一个可工作的时钟，并且和本站读者分享的欲望。如果你想了解如何制作它，请继续阅读！

DEMO DOWNLOAD

jQuery 代码

要想要时钟工作，我们将使用jQuery生成每个数字的标签，并且设置一个定时器每秒钟更新一次样式，为了更简单，我们使用moment.js 库(快速开始) 来补偿JavaScript原生日期和时间方法的缺陷。

assets/js/script.js

$(function(){

	// Cache some selectors

	var clock = $('#clock'),
		alarm = clock.find('.alarm'),
		ampm = clock.find('.ampm');

	// Map digits to their names (this will be an array)
	var digit_to_name = 'zero one two three four five six seven eight nine'.split(' ');

	// This object will hold the digit elements
	var digits = {};

	// Positions for the hours, minutes, and seconds
	var positions = [
		'h1', 'h2', ':', 'm1', 'm2', ':', 's1', 's2'
	];

	// Generate the digits with the needed markup,
	// and add them to the clock

	var digit_holder = clock.find('.digits');

	$.each(positions, function(){

		if(this == ':'){
			digit_holder.append('<div class="dots">');
		}
		else{

			var pos = $('<div>');

			for(var i=1; i<8; i++){
				pos.append('<span class="d' + i + '">');
			}

			// Set the digits as key:value pairs in the digits object
			digits[this] = pos;

			// Add the digit elements to the page
			digit_holder.append(pos);
		}

	});

	// Add the weekday names

	var weekday_names = 'MON TUE WED THU FRI SAT SUN'.split(' '),
		weekday_holder = clock.find('.weekdays');

	$.each(weekday_names, function(){
		weekday_holder.append('<span>' + this + '</span>');
	});

	var weekdays = clock.find('.weekdays span');

	// Run a timer every second and update the clock

	(function update_time(){

		// Use moment.js to output the current time as a string
		// hh is for the hours in 12-hour format,
		// mm - minutes, ss-seconds (all with leading zeroes),
		// d is for day of week and A is for AM/PM

		var now = moment().format("hhmmssdA");

		digits.h1.attr('class', digit_to_name[now[0]]);
		digits.h2.attr('class', digit_to_name[now[1]]);
		digits.m1.attr('class', digit_to_name[now[2]]);
		digits.m2.attr('class', digit_to_name[now[3]]);
		digits.s1.attr('class', digit_to_name[now[4]]);
		digits.s2.attr('class', digit_to_name[now[5]]);

		// The library returns Sunday as the first day of the week.
		// Stupid, I know. Lets shift all the days one position down, 
		// and make Sunday last

		var dow = now[6];
		dow--;

		// Sunday!
		if(dow < 0){
			// Make it last
			dow = 6;
		}

		// Mark the active day of the week
		weekdays.removeClass('active').eq(dow).addClass('active');

		// Set the am/pm text:
		ampm.text(now[7]+now[8]);

		// Schedule this function to be run again in 1 sec
		setTimeout(update_time, 1000);

	})();

	// Switch the theme

	$('a.button').click(function(){
		clock.toggleClass('light dark');
	});

});

这里最重要的代码部分就是 update_time 方法，在它里面，我们获取到当前日期作为一个字符串，并且使用它来填充时钟元素并且给数字设置正确的样式。

有了这些我们的数字时钟已经做好了准备！

下周保持收听啊，我们将要为设置闹铃添加方法并且用HTML5的audio来播放。

E文链接：http://tutorialzine.com/2013/06/digital-clock/

译文链接：http://www.woiweb.net/make-digital-clock-with-jquery-and-css.html

css