圣诞树是通过一个圣诞树图标设置为3D进行旋转,涉及HTML、CSS、JavaScript知识点

雪花背景是利用HTML的新特性canvas编写;

源代码:

<!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" />
    <link rel="stylesheet" href="style.css" />
    <link
      href="https://cdn.bootcdn.net/ajax/libs/font-awesome/5.15.3/css/all.css"
      rel="stylesheet"
    />
    <title>Document</title>
    <style>
      * {
        margin: 0;
        padding: 0;
      }

      body {
        background: #333;
        display: flex;
        width: 100%;
        height: 100vh;
        justify-content: center;
        align-items: center;
      }

      .main {
        width: 200px;
        height: 200px;
        position: absolute;
        display: flex;
        justify-content: center;
        align-items: center;
        animation: roll 5s linear infinite;
        transform-style: preserve-3d;
        transform: rotateX(-15deg);
      }

      .main i {
        font-size: 100px;
        /* 树泛光的颜色 */
        text-shadow: 0 0 10px white, 0 0 20px rgb(50, 50, 156);
        position: absolute;
        /* 树的颜色 */
        color: green;
      }

      /* 每片树叶开始旋转的位置 */
      .main i:nth-child(2) {
        transform: rotateY(90deg);
      }

      .main i:nth-child(3) {
        transform: rotateY(45deg);
      }

      .main i:nth-child(4) {
        transform: rotateY(-45deg);
      }

      @keyframes roll {
        100% {
          transform: rotateX(-15deg) rotateY(360deg);
        }
      }

      .main div {
        position: absolute;
        width: 100%;
        height: 100%;
        border: 2px solid black;
      }
      * {
        margin: 0;
        padding: 0;
      }
      html {
        overflow: hidden;
      }
      body {
        background-size: cover;
      }
      h1 {
        color: #0097e6;
        position: absolute;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
        font-size: 40px;
        cursor: default;
      }
      canvas {
        filter: blur(1px);
      }
    </style>
  </head>

  <body>
    <!-- 雪花背景画布 -->
    <canvas id="canvas"></canvas>
    <!-- 圣诞树图标 -->
    <div class="main">
      <i class="fas fa-tree"></i>
      <i class="fas fa-tree"></i>
      <i class="fas fa-tree"></i>
      <i class="fas fa-tree"></i>
    </div>
  </body>

  <script type="text/javascript">
    var canvas = document.getElementById("canvas");
    var context = canvas.getContext("2d");
    var w = window.innerWidth;
    var h = window.innerHeight;
    canvas.width = w;
    canvas.height = h;
    //设置雪片数量
    var num = 200;
    //定义雪花数组
    var snows = [];
    for (var i = 0; i < num; i++) {
      //向数组填充元素,元素属性有坐标及半径,均为随机生成,其中半径上限为3
      snows.push({
        x: Math.random() * w,
        y: Math.random() * h,
        r: Math.random() * 3,
      });
    }
    //绘制图片
    function draw() {
      context.clearRect(0, 0, w, h); //清空画布
      context.beginPath(); //画笔开始
      for (var i = 0; i < num; i++) {
        var snow = snows[i];
        context.fillStyle = "rgba(255,255,255,0.4)"; //设定填充方式为白色半透明
        context.moveTo(snow.x, snow.y); //画笔移动到指定坐标处
        context.arc(snow.x, snow.y, snow.r, 0, Math.PI * 2); //根据属性绘制圆形
      }
      context.fill(); //填充路径
      //雪片落下
      move();
    }
    function move() {
      for (var i = 0; i < num; i++) {
        var snow = snows[i];
        snow.y += (7 - snow.r) / 10; //根据雪片大小调整落下速度
        if (snow.y > h) {
          //如果雪片超出画布范围,则在顶端重绘
          snows[i] = { x: Math.random() * w, y: 0, r: snow.r };
        }
      }
    }
    //执行和调用函数
    draw();
    setInterval(draw, 1); //每隔一毫秒重绘一次
  </script>
</html>

参考学习教程:b站一个叫   flashaxe 的up主

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