HTML5时钟

css

body {
    background: black;
}

.clock {
    position: absolute;
    opacity: 1;
}

.fill .clock {
    left: 50%;
    top: 50%;
}

.centre {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
}

.expand {
    position: absolute;
    top: 0;
    left: 0;
    transform: translate(-50%, -50%);
}

.anchor {
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 0;
}

.element {
    position: absolute;
    top: 0;
    left: 0;
}

.round {
    border-radius: 296px;
}

.circle-1 {
    background: white;
    width: 12px;
    height: 12px;
}

.circle-2 {
    background: #FA9F22;
    width: 8px;
    height: 8px;
}

.circle-3 {
    background: black;
    width: 4px;
    height: 4px;
}

.second {
    transform: rotate(180deg);
}

.minute {
    transform: rotate(54deg);
}

.second-hand {
    width: 2px;
    height: 164px;
    background: #FA9F22;
    transform: translate(-50%,-100%) translateY(24px);
}

.hour {
    transform: rotate(304.5deg);
}

.thin-hand {
    width: 4px;
    height: 50px;
    background: white;
    transform: translate(-50%,-100%);
}

.fat-hand {
    width: 10px;
    height: 57px;
    border-radius: 10px;
    background: white;
    transform: translate(-50%,-100%) translateY(-18px);
}

.minute-hand {
    height: 112px;
}

.hour-text {
    position: absolute;
    font: 40px Hei, Helvetica, Arial, sans-serif;
    color: white;
    transform: translate(-50%,-50%);
}

.hour-10 {
    padding-left: 0.4ex;
}
.hour-11 {
    padding-left: 0.25ex;
}

.minute-text {
    position: absolute;
    font: 12px Avenir Next, Helvetica, Arial, sans-serif;
    color: white;
    transform: translate(-50%,-50%);
}

.minute-line {
    background: white;
    width: 1px;
    height: 9px;
    transform: translate(-50%,-100%) translateY(-131px);
    opacity: 0.34;
}

js

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)
}