HTML/220711.html at main · awj1052/HTML · GitHub

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<!DOCTYPE html>
<html>

<head>
  <style>
    * {
      margin: 0;
      padding: 0;
    }

    .wrapper {
      place-items: center;
      background: lightgrey;
      display: grid;
      height: 100vh;
    }

    .info {
      text-align: center;
      text-size: 40px;
    }

    .circle {
      height: 400px;
      width: 400px;
      border-radius: 50%;
      background: #c51212cc;
    }

    .start {
      text-align: center;
      width: 75px;
      height: 50px;
      text-size: 20px;
      visibility: visible;
    }
  </style>
</head>

<body>
  <div class="wrapper">
    <div class="info">0 ms</div>
    <div class="circle"></div>
    <div>
      <button class="start">START</button>
    </div>
  </div>

  <script>
    const score = document.querySelector(".info");
    const circle = document.querySelector(".circle");
    const start = document.querySelector(".start");
    let time;
    let flag=false;
    let timeout;

    circle.addEventListener("click", click);
    start.addEventListener("click", btn);

    function click() {
      if (flag) {
        flag = false;
        circle.style.background = '#c51212cc';
        score.innerText = new Date().getTime() - time + " ms";
      }else{
        alert("너무 빠릅니다!");
        clearTimeout(timeout);
      }
      start.style.visibility = 'visible';
    }

    function btn() {
      clearTimeout(timeout);
      start.style.visibility = 'hidden';
      var ranTime = 2000 + Math.floor(Math.random() * 16) * 100
      timeout = setTimeout(() => {
        flag=true;
        circle.style.background = '#12c512cc';
        time = new Date().getTime();
      }, ranTime);
    }


  </script>
</body>

</html>