25.60秒SVG圆形倒计时器实现

创建25.60秒计时器的HTML结构

使用HTML定义一个简单的容器来放置计时器。SVG元素将用于绘制圆形进度条，数字显示通过<div>实现。

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>25.60秒计时器</title>
    <link rel="stylesheet" href="styles.css">
</head>
<body>
    <div class="timer-container">
        <svg class="timer-svg" viewBox="0 0 100 100">
            <circle class="timer-circle-bg" cx="50" cy="50" r="45"/>
            <circle class="timer-circle" cx="50" cy="50" r="45"/>
        </svg>
        <div class="timer-display">25.60</div>
    </div>
</body>
</html>

设计计时器的CSS样式

通过CSS定义计时器的外观和动画效果。使用关键帧动画控制圆形进度条的填充和数字显示。

body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background: #f0f0f0;
    font-family: Arial, sans-serif;
}

.timer-container {
    position: relative;
    width: 200px;
    height: 200px;
}

.timer-svg {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.timer-circle-bg {
    fill: none;
    stroke: #e0e0e0;
    stroke-width: 5;
}

.timer-circle {
    fill: none;
    stroke: #4CAF50;
    stroke-width: 5;
    stroke-dasharray: 283;
    stroke-dashoffset: 283;
    animation: countdown 25.6s linear forwards;
}

.timer-display {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 2.5rem;
    font-weight: bold;
    color: #333;
}

@keyframes countdown {
    from {
        stroke-dashoffset: 283;
    }
    to {
        stroke-dashoffset: 0;
    }
}

实现数字倒计时的CSS动画

通过CSS动画同步数字显示与圆形进度条。使用@keyframes控制数字的变化。

.timer-display {
    animation: countdown-number 25.6s linear forwards;
}

@keyframes countdown-number {
    0% {
        content: "25.60";
    }
    100% {
        content: "0.00";
    }
}

优化SVG动画的平滑性

确保SVG动画平滑运行，避免锯齿效应。通过调整stroke-dasharray和stroke-dashoffset实现圆形填充效果。

.timer-circle {
    stroke-linecap: round;
    transition: stroke-dashoffset 0.1s linear;
}

添加响应式设计

通过媒体查询确保计时器在不同设备上正常显示。

@media (max-width: 600px) {
    .timer-container {
        width: 150px;
        height: 150px;
    }
    .timer-display {
        font-size: 2rem;
    }
}

最终效果说明

上述代码实现了一个25.60秒的计时器，包含以下特性：

圆形进度条通过SVG和CSS动画控制，25.60秒内从满到空。
数字显示同步倒计时，从25.60到0.00。
响应式设计适配不同屏幕尺寸。
纯HTML和CSS实现，无需JavaScript。

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