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【每日一练】237—JS实现一款简易时钟

每日一练10个月前发布 admin
1,604 0

第237练最终效果：

【每日一练】237—JS实现一款简易时钟

HTML:

<!DOCTYPE html>
<html lang=”en”>
  <head>
    <meta charset=”UTF-8″ />
    <meta name=”viewport” content=”width=device-width, initial-scale=1.0″ />
    <link rel=”stylesheet” href=”index.css” />
    <title>第237练</title>
  </head>
  <body>
    <button class=”toggle”>Dark mode</button>
    <div class=”clock-container”>
      <div class=”clock”>
        <div class=”needle hour”></div>
        <div class=”needle minute”></div>
        <div class=”needle second”></div>
        <div class=”center-point”></div>
      </div>
      <div class=”time”></div>
      <div class=”date”></div>
    </div>
    <script src=”index.js”></script>
  </body>
</html>

CSS:

@import url(‘https://fonts.googleapis.com/css?family=Heebo:300&display=swap’);
* {
  box-sizing: border-box;
}
:root {
  –primary-color: #000;
  –secondary-color: #fff;
}
html {
  transition: all 0.5s ease-in;
}
html.dark {
  –primary-color: #fff;
  –secondary-color: #333;
}
html.dark {
  background-color: #111;
  color: var(–primary-color);
}
body {
  font-family: ‘Heebo’, sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  overflow: hidden;
  margin: 0;
}
.toggle {
  cursor: pointer;
  background-color: var(–primary-color);
  color: var(–secondary-color);
  border: 0;
  border-radius: 4px;
  padding: 8px 12px;
  position: absolute;
  top: 100px;
}
.toggle:focus {
  outline: none;
}
.clock-container {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
}
.clock {
  position: relative;
  width: 200px;
  height: 200px;
}
.needle {
  background-color: var(–primary-color);
  position: absolute;
  top: 50%;
  left: 50%;
  height: 65px;
  width: 3px;
  transform-origin: bottom center;
  transition: all 0.5s ease-in;
}
.needle.hour {
  transform: translate(-50%, -100%) rotate(0deg);
}
.needle.minute {
  transform: translate(-50%, -100%) rotate(0deg);
  height: 100px;
}
.needle.second {
  transform: translate(-50%, -100%) rotate(0deg);
  height: 100px;
  background-color: #e74c3c;
}
.center-point {
  background-color: #e74c3c;
  width: 10px;
  height: 10px;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
}
.center-point::after {
  content: ”;
  background-color: var(–primary-color);
  width: 5px;
  height: 5px;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
}
.time {
  font-size: 60px;
}
.date {
  color: #aaa;
  font-size: 14px;
  letter-spacing: 0.3px;
  text-transform: uppercase;
}
.date .circle {
  background-color: var(–primary-color);
  color: var(–secondary-color);
  border-radius: 50%;
  height: 18px;
  width: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 18px;
  transition: all 0.5s ease-in;
  font-size: 12px;
}

JS:

const hourEl = document.querySelector(‘.hour’)
const minuteEl = document.querySelector(‘.minute’)
const secondEl = document.querySelector(‘.second’)
const timeEl = document.querySelector(‘.time’)
const dateEl = document.querySelector(‘.date’)
const toggle = document.querySelector(‘.toggle’)
const days = [“Sunday”, “Monday”, “Tuesday”, “Wednesday”, “Thursday”, “Friday”, “Saturday”];
const months = [“Jan”, “Feb”, “Mar”, “Apr”, “May”, “Jun”, “Jul”, “Aug”, “Sep”, “Oct”, “Nov”, “Dec”];
toggle.addEventListener(‘click’, (e) => {
    const html = document.querySelector(‘html’)
    if (html.classList.contains(‘dark’)) {
        html.classList.remove(‘dark’)
        e.target.innerHTML = ‘Dark mode’
    } else {
        html.classList.add(‘dark’)
        e.target.innerHTML = ‘Light mode’
    }
})
function setTime() {
    const time = new Date();
    const month = time.getMonth()
    const day = time.getDay()
    const date = time.getDate()
    const hours = time.getHours()
    const hoursForClock = hours >= 13 ? hours % 12 : hours;
    const minutes = time.getMinutes()
    const seconds = time.getSeconds()
    const ampm = hours >= 12 ? ‘PM’ : ‘AM’
    hourEl.style.transform = `translate(-50%, -100%) rotate(${scale(hoursForClock, 0, 12, 0, 360)}deg)`
    minuteEl.style.transform = `translate(-50%, -100%) rotate(${scale(minutes, 0, 60, 0, 360)}deg)`
    secondEl.style.transform = `translate(-50%, -100%) rotate(${scale(seconds, 0, 60, 0, 360)}deg)`
    timeEl.innerHTML = `${hoursForClock}:${minutes < 10 ? `0${minutes}` : minutes} ${ampm}`
    dateEl.innerHTML = `${days[day]}, ${months[month]} <span class=”circle”>${date}</span>`
}
const scale = (num, in_min, in_max, out_min, out_max) => {
    return (num – in_min) * (out_max – out_min) / (in_max – in_min) + out_min;
}
setTime()
setInterval(setTime, 1000)

 

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