JSFiddle - React, Tailwind, and code Playground

by Tolibjon Tolibov

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="styles.css" />
    <title>Aim Training | Проект 5</title>
  </head>
  <body>
    <div class="screen">
      <h1>Aim Training</h1>
      <a href="#" class="start" id="start">Начать игру</a>
    </div>

    <div class="screen">
      <h1>Выберите время</h1>
      <ul class="time-list" id="time-list">
        <li>
          <button class="time-btn" data-time="10">
            10 сек
          </button>
        </li>
        <li>
          <button class="time-btn" data-time="20">
            20 сек
          </button>
        </li>
        <li>
          <button class="time-btn" data-time="30">
            30 сек
          </button>
        </li>
        <li>
          <button class="time-btn" data-time="60">
            1 мин
          </button>
        </li>
      </ul>
    </div>

    <div class="screen">
      <h3>Осталось <span id="time">00:00</span></h3>
      <div class="board" id="board"></div>
    </div>
    <script src="app.js"></script>
  </body>
</html>

CSS

@import url('https://fonts.googleapis.com/css?family=Khula&display=swap');

* {
  box-sizing: border-box;
}

body {
  color: #fff;
  font-family: 'Khula', sans-serif;
  height: 100vh;
  overflow: hidden;
  margin: 0;
  text-align: center;
}

a {
  color: #fff;
  text-decoration: none;
}

a:hover {
  color: #16D9E3;
}

.start {
  font-size: 1.5rem;
}

h1 {
  line-height: 1.4;
  font-size: 4rem;
}

.screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  width: 100vw;
  transition: margin 0.5s ease-out;
  background: linear-gradient(90deg, #29323C 0%, #485563 100%);
}

.screen.up {
  margin-top: -100vh;
}

.time-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  list-style: none;
  padding: 0;
}

.time-list li {
  margin: 10px;
}

.time-btn {
  background-color: transparent;
  border: 2px solid #C0C0C0;
  color: #fff;
  cursor: pointer;
  font-family: inherit;
  padding: .5rem 1rem;
  font-size: 1.5rem;
}

.time-btn:hover {
  border: 2px solid #16D9E3;
  color: #16D9E3;
}

.hide {
  opacity: 0;
}

.primary {
  color: #16D9E3;
}

.board {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  width: 500px;
  height: 500px;
  background: linear-gradient(118.38deg, #29323C -4.6%, #485563 200.44%);
  box-shadow: -8px -8px 20px #2A333D, 10px 7px 20px #475462;
  border-radius: 30px;
  overflow: hidden;
}

.circle {
  position: absolute;
  border-radius: 50%;
  cursor: pointer;
}

JavaScript

const startBtn = document.querySelector('#start')
const screens = document.querySelectorAll('.screen')
const timeList = document.querySelector('#time-list')


const timeEl = document.querySelector('#time')
const board = document.querySelector('#board')
let time=0;
let score=0;

startBtn.addEventListener('click', (event)=>{
  event.preventDefault();
  screens[0].classList.add('up')
})

timeList.addEventListener('click', (event)=>{
  if(event.target.classList.contains('time-btn')){
    time=parseInt(event.target.getAttribute('data-time'))
    screens[1].classList.add('up')
    startGame()
  }
  screens[0].classList.add('up')
})

board.addEventListener('click', (event)=>{
  if(event.target.classList.contains('circle')){
  score++
  event.target.remove()
  createRandomCircle()
  }
  screens[0].classList.add('up')
})

function startGame(){
  setInterval(decreaseTime, 1000)
  createRandomCircle()
  setTime(time)
}

function decreaseTime(){

  if(time===0){
    finishGame()
  } else {
    let current=--time
    
    if(current<10){
      current=`0${current}`
    }
    setTime(current)
  }
}

function setTime(value){
  timeEl.innerHTML=`00:${value}`
}

function finishGame(){
  timeEl.parentNode.classList.add('hide')
  board.innerHTML=`<h1>Счет: <span class="primary">${score}</span></h1>`
}

function createRandomCircle(){
  const circle = document.createElement('div')
  const size = getRandomNumber(10,60)
  const {width, height}=board.getBoundingClientRect()

  const x = getRandomNumber(0, width-size)
  const y = getRandomNumber(0, height-size)

  circle.classList.add('circle')
  circle.style.width=`${size}px`
  circle.style.height=`${size}px`
  circle.style.top=`${y}px`
  circle.style.left=`${x}px`

  let color=`rgb(${Math.floor(Math.random()*255)},${Math.floor(Math.random()*255)},${Math.floor(Math.random()*255)}`
  circle.style.background=color;
  circle.style.border='1px solid #fff';
  
  board.append(circle)

}

function getRandomNumber(min, max){
  return...