<!DOCTYPE html> <html lang="zh"> <head> <meta charset="UTF-8"> <title>随机抽号动画</title> <style> body { display: flex; flex-direction: column; align-items: center; background-color: #2c3e50; min-height: 100vh; margin: 0; font-family: Arial, sans-serif; } #number-container { width: 200px; height: 200px; margin: 50px auto; perspective:
以下是为您生成的上述代码的优化建议： 在 `startDrawing` 函数中，可以将 `updateNumber` 函数的定义提取到函数外部，以提高代码的可读性。 ```javascript let isDrawing = false; let intervalId; let currentNumber = 0; function updateNumber() { currentNumber = Math.floor(Math.random() * 50) + 1; document.getElementById('number-display').textContent = currentNumber.toString().padStart(2, '0'); } function startDrawing() { if (isDrawing) return; isDrawing = true; document.getElementById('startBtn').disabled = true; document.getElementById('number-display').classList.add('rolling'); let speed = 50; const slowDownThreshold = 2000; // 2 秒后开始减速 const startTime = Date.now(); function draw() { const elapsed = Date.now() - startTime; if (elapsed < slowDownThreshold) { speed = Math.max(20, speed - 1); } else { speed = Math.min(200, speed + 5); } updateNumber(); if (elapsed > 3000) { // 总共持续 3 秒 stopDrawing(); } else { intervalId = setTimeout(draw, speed); } } intervalId = setTimeout(draw, speed); } function stopDrawing() { clearTimeout(intervalId); isDrawing = false; document.getElementById('number-display').classList.remove('rolling'); document.getElementById('startBtn').disabled = false; // 最终结果动画 const display = document.getElementById('number-display'); display.style.transform = 'scale(1.2)'; setTimeout(() => { display.style.transform = 'scale(1)'; }, 200); } ``` 额外注意逻辑点： 1. 确保随机数生成的范围和您的需求一致。 2. 对于动画效果的持续时间和速度调整，要根据实际效果进行微调以达到最佳体验。 3. 注意处理可能的异常情况，比如用户频繁点击开始按钮。 [2025-03-19 22:39:23 | AI写代码神器 | 512点数解答]
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