【每日一练】238—JS实现一款简易时钟

每日一练11个月前发布 admin
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第238练的最终效果如下:

【每日一练】238—JS实现一款简易时钟

HTML:

<!DOCTYPE html>
<html lang=”en”>
<head>
    <meta charset=”UTF-8″>
    <meta http-equiv=”X-UA-Compatible” content=”IE=edge”>
    <meta name=”viewport” content=”width=device-width, initial-scale=1.0″>
    <title>第238练</title>
    <link rel=”stylesheet” href=”https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.3/css/all.min.css” integrity=”sha512-iBBXm8fW90+nuLcSKlbmrPcLa0OT92xO1BIsZ+ywDWZCvqsWgccV3gFoRBv0z+8dLJgyAHIhR35VZc2oM/gI1w==” crossorigin=”anonymous” />
    <link href=”https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta3/dist/css/bootstrap.min.css” rel=”stylesheet” integrity=”sha384-eOJMYsd53ii+scO/bJGFsiCZc+5NDVN2yr8+0RDqr0Ql0h+rP48ckxlpbzKgwra6″ crossorigin=”anonymous”>
    <link rel=”stylesheet” href=”index.css”>
</head>
<body>
    <div class=”preloader”>
        <img src=”preloader.gif” alt=”preloader”>
    </div>
   <Header>
       <video class=”background-video” muted autoplay loop src=”background-video.mp4″></video>
       <h1>第238练开启</h1>
       <button class=”btn btn-secondary”>
        <i class=”fa fa-pause” aria-hidden=”true”></i>
       </button>
   </Header>
   <script src=”index.js”></script>
</body>
</html>

CSS:

body {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
}
h1 {
  font-size: 2.5rem;
  color: white;
  letter-spacing: 0.277em;
  font-weight: 300;
}
.background-video {
  position: absolute;
  top: 0;
  left: 0;
  z-index: -1;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(30%);
}
header {
  min-height: 100vh;
  display: grid;
  place-items: center;
}
.preloader {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: white;
  display: grid;
  justify-content: center;
  align-items: center;
  z-index: 999;
  transition: 0.1s linear;
}

JS:

const btn = document.querySelector(“.btn”);
const video = document.querySelector(“.background-video”);
const fa = document.querySelector(“.fa”);
const preloader = document.querySelector(“.preloader”);
btn.addEventListener(“click”, () => {
  if (btn.classList.contains(“pause”)) {
    btn.classList.remove(“pause”);
    video.play();
    fa.classList.add(“fa-pause”);
    fa.classList.remove(“fa-play”);
  } else {
    btn.classList.add(“pause”);
    video.pause();
    fa.classList.remove(“fa-pause”);
    fa.classList.add(“fa-play”);
  }
});
window.addEventListener(“load”, () => {
  preloader.style.zIndex = “-999”;
});
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