js响应式全屏桌面在线时钟代码

使用方法

var clock = document.querySelector('#utility-clock')
utilityClock(clock)
if (clock.parentNode.classList.contains('fill')) autoResize(clock, 295 + 32)

function utilityClock(container) {
	var dynamic = container.querySelector('.dynamic')
	var hourElement = container.querySelector('.hour')
	var minuteElement = container.querySelector('.minute')
	var secondElement = container.querySelector('.second')
	var minute = function(n) {
		return n % 5 == 0 ? minuteText(n) : minuteLine(n)
	}
	var minuteText = function(n) {
		var element = document.createElement('div')
		element.className = 'minute-text'
		element.innerHTML = (n < 10 ? '0' : '') + n
		position(element, n / 60, 135)
		dynamic.appendChild(element)
	}
	var minuteLine = function(n) {
		var anchor = document.createElement('div')
		anchor.className = 'anchor'
		var element = document.createElement('div')
		element.className = 'element minute-line'
		rotate(anchor, n)
		anchor.appendChild(element)
		dynamic.appendChild(anchor)
	}
	var hour = function(n) {
		var element = document.createElement('div')
		element.className = 'hour-text hour-' + n
		element.innerHTML = n
		position(element, n / 12, 105)
		dynamic.appendChild(element)
	}
	var position = function(element, phase, r) {
		var theta = phase * 2 * Math.PI
		element.style.top = (-r * Math.cos(theta)).toFixed(1) + 'px'
		element.style.left = (r * Math.sin(theta)).toFixed(1) + 'px'
	}
	var rotate = function(element, second) {
		element.style.transform = element.style.webkitTransform = 'rotate(' + (second * 6) + 'deg)'
	}
	var animate = function() {
		var now = new Date()
		var time = now.getHours() * 3600 +
			now.getMinutes() * 60 +
			now.getSeconds() * 1 +
			now.getMilliseconds() / 1000
		rotate(secondElement, time)
		rotate(minuteElement, time / 60)
		rotate(hourElement, time / 60 / 12)
		requestAnimationFrame(animate)
	}
	for (var i = 1; i <= 60; i++) minute(i)
	for (var i = 1; i <= 12; i++) hour(i)
	animate()
}

function autoResize(element, nativeSize) {
	var update = function() {
		var scale = Math.min(window.innerWidth, window.innerHeight) / nativeSize
		element.style.transform = element.style.webkitTransform = 'scale(' + scale.toFixed(3) + ')'
	}
	update()
	window.addEventListener('resize', update)
}