用HTML5实现灯笼效果

本文介绍了两种实现效果：一种使用画布（canvas）标签/元素，另一种不用画布（canvas）标签/元素主要使用CSS实现。

使用画布（canvas）标签/元素实现，下面，在画布上，用JavaScript画两个红灯笼，并且红灯笼左右来回移动的源码：

<!DOCTYPE html>
<html>
<head>
  <title>红灯笼</title>
  <style>
    canvas {
      border: 1px solid black;
      background-color: blue; /*设置画布的背景色为蓝色*/
    }
  </style>
</head>
<body>
<!-- 设置画布宽高是500*300，单位是 px。 -->
  <canvas id="canvas" width="500" height="300"></canvas>

  <script>
    var canvas = document.getElementById('canvas');
    var context = canvas.getContext('2d');

    var angle1 = 0;
    var angle2 = 0;  // 使第二个灯笼的初始角度与第一个灯笼不同

    function drawLantern(x, y, radius, angle) {
      x += Math.sin(angle) * 20;

      // Draw the suspension line
      context.beginPath();
      context.moveTo(x, y - radius / 4);
      context.lineTo(x, 0);
      context.stroke();

      // Draw the top 
      context.beginPath();
      context.arc(x, y, radius / 4, 0, Math.PI * 2);
      context.fillStyle = 'gold';
      context.fill();
      context.stroke();

      // Draw the main body
      context.beginPath();
      context.arc(x, y, radius, 0, Math.PI * 2);
      context.fillStyle = 'red';
      context.fill();
      context.stroke();

      // Draw the bottom
      context.beginPath();
      context.arc(x, y + radius / 2, radius / 4, 0, Math.PI * 2);
      context.fillStyle = 'gold';
      context.fill();
      context.stroke();

      // Draw the tassel
      context.beginPath();
      context.moveTo(x, y + radius / 2);
      context.lineTo(x, y + radius * 1.2);
      context.moveTo(x - radius / 6, y + radius / 2);
      context.lineTo(x - radius / 6, y + radius * 1.2);
      context.moveTo(x + radius / 6, y + radius / 2);
      context.lineTo(x + radius / 6, y + radius * 1.2);
      context.stroke();
    }

    function animate() {
      context.clearRect(0, 0, canvas.width, canvas.height);

      context.fillStyle = 'blue';
      context.fillRect(0, 0, canvas.width, canvas.height);

      drawLantern(200, 200, 50, angle1);
      drawLantern(300, 200, 50, angle2);

      angle1 += 0.05;
      angle2 += 0.05;

      requestAnimationFrame(animate);
    }

    animate();
  </script>
</body>
</html>

运行效果如下：

下面是另一种实现主要使用CSS实现，源码如下：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>红灯笼效果</title>

<!-- 灯笼代码↓，放在 head标签内-->
<div class="deng-box2">
    <div class="deng">
        <div class="xian">
        </div>
        <div class="deng-a">
            <div class="deng-b">
                <div class="deng-t">年</div>
            </div>
        </div>
        <div class="shui shui-a">
            <div class="shui-c">
            </div>
            <div class="shui-b"></div>
        </div>
    </div>
</div>
<div class="deng-box3">
    <div class="deng">
        <div class="xian">
        </div>
        <div class="deng-a">
            <div class="deng-b">
                <div class="deng-t">新</div>
            </div>
        </div>
        <div class="shui shui-a">
            <div class="shui-c"></div>
            <div class="shui-b">
            </div>
        </div>
    </div>
</div>
<div class="deng-box1">
    <div class="deng">
        <div class="xian">
        </div>
        <div class="deng-a">
            <div class="deng-b">
                <div class="deng-t">乐</div>
            </div>
        </div>
        <div class="shui shui-a">
            <div class="shui-c"></div>
            <div class="shui-b"></div>
        </div>
    </div>
</div>
<div class="deng-box">
    <div class="deng">
        <div class="xian">
        </div>
        <div class="deng-a">
            <div class="deng-b">
                <div class="deng-t">快</div>
            </div>
        </div>
        <div class="shui shui-a">
            <div class="shui-c">
            </div>
            <div class="shui-b"></div>
        </div>
    </div>
</div>
<style type="text/css">
    .deng-box {
        position: fixed;
        top: -40px;
        right: 150px;
        z-index: 9999;
        pointer-events: none;
    }
    .deng-box1 {
        position: fixed;
        top: -30px;
        right: 10px;
        z-index: 9999;
        pointer-events: none
    }
    .deng-box2 {
        position: fixed;
        top: -40px;
        left: 150px;
        z-index: 9999;
        pointer-events: none
    }
    .deng-box3 {
        position: fixed;
        top: -30px;
        left: 10px;
        z-index: 9999;
        pointer-events: none
    }
    .deng-box1 .deng,
    .deng-box3 .deng {
        position: relative;
        width: 120px;
        height: 90px;
        margin: 50px;
        background: #d8000f;
        background: rgba(216, 0, 15, .8);
        border-radius: 50% 50%;
        -webkit-transform-origin: 50% -100px;
        -webkit-animation: swing 5s infinite ease-in-out;
        box-shadow: -5px 5px 30px 4px #fc903d
    }
    .deng {
        position: relative;
        width: 120px;
        height: 90px;
        margin: 50px;
        background: #d8000f;
        background: rgba(216, 0, 15, .8);
        border-radius: 50% 50%;
        -webkit-transform-origin: 50% -100px;
        -webkit-animation: swing 3s infinite ease-in-out;
        box-shadow: -5px 5px 50px 4px #fa6c00
    }
    .deng-a {
        width: 100px;
        height: 90px;
        background: #d8000f;
        background: rgba(216, 0, 15, .1);
        margin: 12px 8px 8px 8px;
        border-radius: 50% 50%;
        border: 2px solid #dc8f03
    }
    .deng-b {
        width: 45px;
        height: 90px;
        background: #d8000f;
        background: rgba(216, 0, 15, .1);
        margin: -4px 8px 8px 26px;
        border-radius: 50% 50%;
        border: 2px solid #dc8f03
    }
    .xian {
        position: absolute;
        top: -20px;
        left: 60px;
        width: 2px;
        height: 20px;
        background: #dc8f03
    }
    .shui-a {
        position: relative;
        width: 5px;
        height: 20px;
        margin: -5px 0 0 59px;
        -webkit-animation: swing 4s infinite ease-in-out;
        -webkit-transform-origin: 50% -45px;
        background: orange;
        border-radius: 0 0 5px 5px
    }
    .shui-b {
        position: absolute;
        top: 14px;
        left: -2px;
        width: 10px;
        height: 10px;
        background: #dc8f03;
        border-radius: 50%
    }
    .shui-c {
        position: absolute;
        top: 18px;
        left: -2px;
        width: 10px;
        height: 35px;
        background: orange;
        border-radius: 0 0 0 5px
    }
    .deng:before {
        position: absolute;
        top: -7px;
        left: 29px;
        height: 12px;
        width: 60px;
        content: " ";
        display: block;
        z-index: 999;
        border-radius: 5px 5px 0 0;
        border: solid 1px #dc8f03;
        background: orange;
        background: linear-gradient(to right, #dc8f03, orange, #dc8f03, orange, #dc8f03)
    }
    .deng:after {
        position: absolute;
        bottom: -7px;
        left: 10px;
        height: 12px;
        width: 60px;
        content: " ";
        display: block;
        margin-left: 20px;
        border-radius: 0 0 5px 5px;
        border: solid 1px #dc8f03;
        background: orange;
        background: linear-gradient(to right, #dc8f03, orange, #dc8f03, orange, #dc8f03)
    }
    .deng-t {
        font-family: 黑体, Arial, Lucida Grande, Tahoma, sans-serif;
        font-size: 3.2rem;
        color: #dc8f03;
        font-weight: 700;
        line-height: 85px;
        text-align: center
    }
    .night .deng-box,
    .night .deng-box1,
    .night .deng-t {
        background: 0 0 !important
    }
    @-moz-keyframes swing {
        0% {
            -moz-transform: rotate(-10deg)
        }
        50% {
            -moz-transform: rotate(10deg)
        }
        100% {
            -moz-transform: rotate(-10deg)
        }
    }
    @-webkit-keyframes swing {
        0% {
            -webkit-transform: rotate(-10deg)
        }
        50% {
            -webkit-transform: rotate(10deg)
        }
        100% {
            -webkit-transform: rotate(-10deg)
        }
    }
</style>
<!-- 灯笼代码↑-->

</head>
<body>
 

</body>
</html>

运行效果如下：