JavaScript Drum Kit 指南(纯 JS 模拟敲鼓效果)

核心代码：

<script>
 function removeTransition(event) {
  if (event.propertyName !== 'transform') return; // 过滤其中一种事件
  event.target.classList.remove('playing'); // 移除高亮的样式
 }

 function playSound(event) {
  const audio = document.querySelector(`audio[data-key="${event.keyCode}"]`); // 根据触发按键的键码，获取对应音频
  const key = document.querySelector(`div[data-key="${event.keyCode}"]`); // 获取页面对应按钮 DIV 元素
  if (!audio) return; // 处理无效的按键事件

  key.classList.add('playing'); // 改变样式
  audio.currentTime = 0; // 每次播放之后都使音频播放进度归零
  audio.play(); // 播放相应音效
 }

 const keys = Array.from(document.querySelectorAll('.key')); // 获取页面所有按钮元素
 keys.forEach(key => key.addEventListener('transitionend', removeTransition)); // 添加 transition 事件监听
 window.addEventListener('keydown', playSound);
</script>

中文版本完整代码：

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>JS Drum Kit</title>
 <link rel="stylesheet" href="style.css" rel="external nofollow" rel="external nofollow" >
</head>
<body>

 <div class="keys">
  <div data-key="65" class="key">
   <kbd>A</kbd>
   <span class="sound">clap</span>
  </div>
  <div data-key="83" class="key">
   <kbd>S</kbd>
   <span class="sound">hihat</span>
  </div>
  <div data-key="68" class="key">
   <kbd>D</kbd>
   <span class="sound">kick</span>
  </div>
  <div data-key="70" class="key">
   <kbd>F</kbd>
   <span class="sound">openhat</span>
  </div>
  <div data-key="71" class="key">
   <kbd>G</kbd>
   <span class="sound">boom</span>
  </div>
  <div data-key="72" class="key">
   <kbd>H</kbd>
   <span class="sound">ride</span>
  </div>
  <div data-key="74" class="key">
   <kbd>J</kbd>
   <span class="sound">snare</span>
  </div>
  <div data-key="75" class="key">
   <kbd>K</kbd>
   <span class="sound">tom</span>
  </div>
  <div data-key="76" class="key">
   <kbd>L</kbd>
   <span class="sound">tink</span>
  </div>
 </div>

 <audio data-key="65" src="sounds/clap.wav"></audio>
 <audio data-key="83" src="sounds/hihat.wav"></audio>
 <audio data-key="68" src="sounds/kick.wav"></audio>
 <audio data-key="70" src="sounds/openhat.wav"></audio>
 <audio data-key="71" src="sounds/boom.wav"></audio>
 <audio data-key="72" src="sounds/ride.wav"></audio>
 <audio data-key="74" src="sounds/snare.wav"></audio>
 <audio data-key="75" src="sounds/tom.wav"></audio>
 <audio data-key="76" src="sounds/tink.wav"></audio>

<script>
 function removeTransition(event) {
  if (event.propertyName !== 'transform') return; // 过滤其中一种事件
  event.target.classList.remove('playing'); // 移除高亮的样式
 }

 function playSound(event) {
  const audio = document.querySelector(`audio[data-key="${event.keyCode}"]`); // 根据触发按键的键码，获取对应音频
  const key = document.querySelector(`div[data-key="${event.keyCode}"]`); // 获取页面对应按钮 DIV 元素
  if (!audio) return; // 处理无效的按键事件

  key.classList.add('playing'); // 改变样式
  audio.currentTime = 0; // 每次播放之后都使音频播放进度归零
  audio.play(); // 播放相应音效
 }

 const keys = Array.from(document.querySelectorAll('.key')); // 获取页面所有按钮元素
 keys.forEach(key => key.addEventListener('transitionend', removeTransition)); // 添加 transition 事件监听
 window.addEventListener('keydown', playSound);
</script>

</body>
</html>

英文版本完整代码：

<!DOCTYPE html>
<html lang="en">

<head>
 <meta charset="UTF-8">
 <title>JS Drum Kit</title>
 <link rel="stylesheet" href="style.css" rel="external nofollow" rel="external nofollow" >
</head>

<body>

 <div class="keys">
  <div data-key="65" class="key">
   <kbd>A</kbd>
   <span class="sound">clap</span>
  </div>
  <div data-key="83" class="key">
   <kbd>S</kbd>
   <span class="sound">hihat</span>
  </div>
  <div data-key="68" class="key">
   <kbd>D</kbd>
   <span class="sound">kick</span>
  </div>
  <div data-key="70" class="key">
   <kbd>F</kbd>
   <span class="sound">openhat</span>
  </div>
  <div data-key="71" class="key">
   <kbd>G</kbd>
   <span class="sound">boom</span>
  </div>
  <div data-key="72" class="key">
   <kbd>H</kbd>
   <span class="sound">ride</span>
  </div>
  <div data-key="74" class="key">
   <kbd>J</kbd>
   <span class="sound">snare</span>
  </div>
  <div data-key="75" class="key">
   <kbd>K</kbd>
   <span class="sound">tom</span>
  </div>
  <div data-key="76" class="key">
   <kbd>L</kbd>
   <span class="sound">tink</span>
  </div>
 </div>

 <audio data-key="65" src="sounds/clap.wav"></audio>
 <audio data-key="83" src="sounds/hihat.wav"></audio>
 <audio data-key="68" src="sounds/kick.wav"></audio>
 <audio data-key="70" src="sounds/openhat.wav"></audio>
 <audio data-key="71" src="sounds/boom.wav"></audio>
 <audio data-key="72" src="sounds/ride.wav"></audio>
 <audio data-key="74" src="sounds/snare.wav"></audio>
 <audio data-key="75" src="sounds/tom.wav"></audio>
 <audio data-key="76" src="sounds/tink.wav"></audio>

 <script>
  /** GOAL: When a user opens this page and presses a key that corresponds with
   * one of our div elements, we should play the audio clip associated with
   * the keypress, add a class to the specific element that matches with the keypress,
   * and then remove that class in order to reset the element to it's original state.
   */
  (()=> {
   const playSound = (e) => {
    const soundclip = document.querySelector(`audio[data-key="${e.keyCode}"]`);
    const keyelement = document.querySelector(`.key[data-key="${e.keyCode}"]`);
    if (!soundclip) return undefined; // Stop function from running if key pressed doesn't match up with our elements
    keyelement.classList.add('playing');
    // Ensures that the sound clip always plays from the beginning. Otherwise,
    // if the 'a' key is pressed twice rapidly, the soundclip will only play through
    // once.
    soundclip.currentTime = 0;
    soundclip.play(); // Play sound
   }
   const removeTransition = (e) => {
    // skip if it's not a transform event
    if (e.propertyName !== 'transform') return undefined;
    e.target.classList.remove('playing');
   }
   // Find all elements in the document with a class 'key'
   const keys = document.querySelectorAll('.key');
   // Listen for any `keydown` events that occur on this browser window instance (this page)
   // When a `keydown` event is observered, trigger the `playSound` function, passing in the
   // `keydown` event as the argument (e)
   window.addEventListener('keydown', playSound);
   keys.forEach(key =>
    key.addEventListener(
     'transitionend',
     (e) => removeTransition.call(key, e)
    ));
  })();
 </script>

</body>

</html>

在线演示地址：http://demo.jb51.net/js/2017/JavaScript30/JavaScriptDrumKit/index-FINISHED.html

请在chrome浏览器下查看效果。

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