我们必须仅使用div
s (document.createElement()
)在JavaScript中构建时钟。不知怎么的,我从来没有弄清楚div
的定位。目前,我已经在努力制作第一个DIV。
如果我在角度的计算中有错误,很抱歉。
有没有更好的方法来实现这个目标?
现在它看起来有点像这样:
红线表示时钟的编号(总共12个)。
window.onload = function drawclock() {
var clock = this.document.getElementById("clock");
var width = clock.offsetHeight;
var radius = width / 2;
for (var i = 1; i < 12; i++) {
var element = document.createElement("DIV");
addClass(element, "h");
addClass(element, i);
var deg = 30 * i;
var x = Math.cos(deg * (180 / Math.PI)) * radius + radius;
var y = Math.sin((90 - deg) * (180 / Math.PI)) * radius + radius;
console.log(x + " " + y);
element.style.position = "absolute";
element.style.left = x + "px";
element.style.top = y + "px";
element.style.transform = "rotate(" + deg + "deg)";
clock.appendChild(element);
}
}
function addClass(element, name) {
var arr;
arr = element.className.split(" ");
if (arr.indexOf(name) == -1) {
element.className += " " + name;
}
}
* {
margin: 0;
padding: 0;
border: 0;
}
body {
background-color: #000;
}
#clock {
height: 500px;
width: 500px;
background-color: #DDDDDD;
border-radius: 100%;
position: absolute;
}
.h {
width: 10px;
height: 70px;
background-color: red
}
.m {
width: 5px;
height: 80px;
background-color: blue
}
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>Page Title</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" type="text/css" media="screen" href="main.css" />
<script src="main.js"></script>
</head>
<body>
<div id="clock">
</div>
</body>
</html>
发布于 2018-05-31 06:25:58
这是一个由Eric Brewer在CodePen上制作的时钟示例。
我已经编译了SCSS和Pug,只保留了使时钟工作所需的代码部分。这个版本不需要任何JavaScript就能运行。
但是,我添加了一些JavaScript代码,使其从特定位置开始。这可以通过使用类Date
获取当前日期,并使用每个时钟臂的animationDelay
属性设置animation-delay
CSS属性来实现。
以下是工作代码:
let setTime = function(date) {
const delay = [
date.getHours() * 3600 + date.getMinutes() * 60 + date.getSeconds(),
date.getMinutes() * 60 + date.getSeconds(),
date.getSeconds()
];
[...document.querySelectorAll('.hand')].forEach((e, i) => e.style.animationDelay = `-${delay[i]}s`);
}
setTime(new Date())
body {
width: 100%;
height: 100vh;
display: flex;
justify-content: center;
align-items: center;
}
/* Main style for the clock */
.face {
position: relative;
display: flex;
justify-content: center;
align-items: flex-start;
width: 400px;
height: 400px;
background: #eee;
border-radius: 50%;
padding: 20px;
border: 20px solid #d9d9d9;
}
.face:after {
display: block;
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
content: "";
border-radius: 50%;
z-index: 3;
}
/* Numbers: styling and positioning */
.numbers {
position: relative;
}
.number {
position: absolute;
height: 200px;
transform-origin: 0 100%;
font-size: 28px;
}
.number:nth-child(1) {
transform: rotate(25deg);
}
.number:nth-child(1) span {
display: block;
transform: rotate(-25deg);
}
.number:nth-child(2) {
transform: rotate(55deg);
}
.number:nth-child(2) span {
display: block;
transform: rotate(-55deg);
}
.number:nth-child(3) {
transform: rotate(85deg);
}
.number:nth-child(3) span {
display: block;
transform: rotate(-85deg);
}
.number:nth-child(4) {
transform: rotate(115deg);
}
.number:nth-child(4) span {
display: block;
transform: rotate(-115deg);
}
.number:nth-child(5) {
transform: rotate(145deg);
}
.number:nth-child(5) span {
display: block;
transform: rotate(-145deg);
}
.number:nth-child(6) {
transform: rotate(178deg);
}
.number:nth-child(6) span {
display: block;
transform: rotate(-175deg);
}
.number:nth-child(7) {
transform: rotate(205deg);
}
.number:nth-child(7) span {
display: block;
transform: rotate(-205deg);
}
.number:nth-child(8) {
transform: rotate(235deg);
}
.number:nth-child(8) span {
display: block;
transform: rotate(-235deg);
}
.number:nth-child(9) {
transform: rotate(265deg);
}
.number:nth-child(9) span {
display: block;
transform: rotate(-265deg);
}
.number:nth-child(10) {
transform: rotate(295deg);
}
.number:nth-child(10) span {
display: block;
transform: rotate(-295deg);
}
.number:nth-child(11) {
transform: rotate(325deg);
}
.number:nth-child(11) span {
display: block;
transform: rotate(-325deg);
}
.number:nth-child(12) {
transform: rotate(355deg);
}
.number:nth-child(12) span {
display: block;
transform: rotate(-355deg);
}
/* Clock hands styling */
.hands {
position: absolute;
top: 50%;
left: 50%;
}
.hand {
position: absolute;
top: 50%;
left: 50%;
height: 120px;
width: 10px;
content: "";
background: black;
transform: translate(-50%, -100%);
border-radius: 0 0 20px 20px;
transform-origin: 50% 100%;
z-index: 4;
animation: count 3600s linear infinite;
}
.hand:before {
display: block;
position: absolute;
top: -50px;
width: 0;
height: 0;
border: 10px solid transparent;
border-width: 10px 5px 41px;
border-bottom-color: black;
content: "";
}
.hand.hand-hour {
height: 70px;
transform: translate(-50%, -100%) rotate(30deg);
animation: count 43200s linear infinite;
}
.hand.hand-second {
height: 130px;
width: 8px;
transform: translate(-50%, -100%) rotate(60deg);
z-index: 3;
background: red;
animation: count 60s linear infinite;
}
.hand.hand-second .body {
display: block;
position: relative;
top: 0;
left: 0;
width: 100%;
height: 100%;
content: "";
background: red;
z-index: 4;
}
.hand.hand-second:before {
border-width: 10px 4px 41px;
border-bottom-color: red;
z-index: -1;
}
/* animation of the clock hands */
@keyframes count {
0%,
100% {
transform: translate(-50%, -100%);
}
25% {
transform: translate(-50%, -100%) rotate(90deg);
}
50% {
transform: translate(-50%, -100%) rotate(180deg);
}
75% {
transform: translate(-50%, -100%) rotate(270deg);
}
}
<div class="watch">
<div class="face">
<div class="numbers">
<div class="number number-1"><span>1</span></div>
<div class="number number-2"><span>2</span></div>
<div class="number number-3"><span>3</span></div>
<div class="number number-4"><span>4</span></div>
<div class="number number-5"><span>5</span></div>
<div class="number number-6"><span>6</span></div>
<div class="number number-7"><span>7</span></div>
<div class="number number-8"><span>8</span></div>
<div class="number number-9"><span>9</span></div>
<div class="number number-10"><span>10</span></div>
<div class="number number-11"><span>11</span></div>
<div class="number number-12"><span>12</span></div>
</div>
<div class="hands">
<div class="hand hand-hour"></div>
<div class="hand hand-minute"></div>
<div class="hand hand-second">
<div class="body"></div>
</div>
</div>
</div>
</div>
只需在date
中设置当前日期,JavaScript代码将循环通过时钟的手臂并延迟每个动画。CSS动画将允许时钟在页面加载后继续运行。
这种方法比使用JavaScript函数计算位置和移动时钟指针效率高得多。CSS动画在这里要强大得多。
编辑:
当你编写一段代码时,你应该总是从一张纸开始,并在开始输入之前定义你想要什么,你将如何实现它。在打字之前,你必须有一个计划,否则,它根本不会起作用。
所以,正如你告诉我的那样,你只想定位数字刻度(最初的问题并不是那么清楚...)。将所有的刻度作为黑色矩形放置在中心,设置它们的height
和width
会更容易一些。所以我们有:
然后使用transform
属性将每个刻度旋转到正确的角度:0°
、30°
、60°
、90°
、...、300°
、330°
和360°
。使用rotate(x deg)
。
最后,这里是正确设置刻度大小的trick:使用渐变隐藏刻度更靠近中心的部分,这样我们只显示每个刻度的尖端:
background: linear-gradient(
to top,
#eee 0%,
#eee 80%,
black 80%,
black 100%
);
最后,你应该拥有:
将这段代码与前面的代码结合起来,可以让时钟转起来:
let drawTicks = function() {
for (let i = 1; i < 13; i++) {
let el = document.createElement('div');
el.setAttribute('class', `number number${i}`);
el.style.transform = `rotate(${i*30}deg)`;
document.querySelector('.numbers').appendChild(el);
}
}; drawTicks()
let setTime = function(date) {
const delay = [
date.getHours() * 3600 + date.getMinutes() * 60 + date.getSeconds(),
date.getMinutes() * 60 + date.getSeconds(),
date.getSeconds()
];
[...document.querySelectorAll('.hand')].forEach((e, i) => e.style.animationDelay = `-${delay[i]}s`);
}; setTime(new Date())
body {
width: 100%;
height: 100vh;
display: flex;
justify-content: center;
align-items: center;
}
/* Main style for the clock */
.face {
position: relative;
display: flex;
justify-content: center;
align-items: flex-start;
width: 400px;
height: 400px;
background: #eee;
border-radius: 50%;
padding: 20px;
border: 20px solid #d9d9d9;
}
.face:after {
display: block;
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
content: "";
border-radius: 50%;
z-index: 3;
}
/* Numbers: styling and positioning */
.numbers {
position: relative;
}
.number {
width: 5px;
background: linear-gradient( to top, #eee 0%, #eee 80%, black 80%, black 100%);
position: absolute;
height: 200px;
transform-origin: 0 100%;
font-size: 28px;
}
/* Clock hands styling */
.hands {
position: absolute;
top: 50%;
left: 50%;
}
.hand {
position: absolute;
top: 50%;
left: 50%;
height: 120px;
width: 10px;
content: "";
background: black;
transform: translate(-50%, -100%);
border-radius: 0 0 20px 20px;
transform-origin: 50% 100%;
z-index: 4;
animation: count 3600s linear infinite;
}
.hand:before {
display: block;
position: absolute;
top: -50px;
width: 0;
height: 0;
border: 10px solid transparent;
border-width: 10px 5px 41px;
border-bottom-color: black;
content: "";
}
.hand.hand-hour {
height: 70px;
transform: translate(-50%, -100%) rotate(30deg);
animation: count 43200s linear infinite;
}
.hand.hand-second {
height: 130px;
width: 8px;
transform: translate(-50%, -100%) rotate(60deg);
z-index: 3;
background: red;
animation: count 60s linear infinite;
}
.hand.hand-second:before {
border-width: 10px 4px 41px;
border-bottom-color: red;
z-index: -1;
}
/* animation of the clock hands */
@keyframes count {
0%,
100% {
transform: translate(-50%, -100%);
}
25% {
transform: translate(-50%, -100%) rotate(90deg);
}
50% {
transform: translate(-50%, -100%) rotate(180deg);
}
75% {
transform: translate(-50%, -100%) rotate(270deg);
}
}
<div class="watch">
<div class="face">
<div class="numbers"></div>
<div class="hands">
<div class="hand hand-hour"></div>
<div class="hand hand-minute"></div>
<div class="hand hand-second">
</div>
</div>
</div>
</div>
https://stackoverflow.com/questions/50613485
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