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核心代碼：
<script>
function removeTransition(event) {
if (event.propertyName !== 'transform') return; // 過濾其中一種事件
event.target.classList.remove('playing'); // 移除高亮的樣式
}
function playSound(event) {
const audio = document.querySelector(`audio[data-key="${event.keyCode}"]`); // 根據觸發按鍵的鍵碼，獲取對應音頻
const key = document.querySelector(`div[data-key="${event.keyCode}"]`); // 獲取頁面對應按鈕 DIV 元素
if (!audio) return; // 處理無效的按鍵事件
key.classList.add('playing'); // 改變樣式
audio.currentTime = 0; // 每次播放之后都使音頻播放進度歸零
audio.play(); // 播放相應音效
}
const keys = Array.from(document.querySelectorAll('.key')); // 獲取頁面所有按鈕元素
keys.forEach(key => key.addEventListener('transitionend', removeTransition)); // 添加 transition 事件監聽
window.addEventListener('keydown', playSound);
</script>
中文版本完整代碼：
<!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; // 過濾其中一種事件
event.target.classList.remove('playing'); // 移除高亮的樣式
}
function playSound(event) {
const audio = document.querySelector(`audio[data-key="${event.keyCode}"]`); // 根據觸發按鍵的鍵碼，獲取對應音頻
const key = document.querySelector(`div[data-key="${event.keyCode}"]`); // 獲取頁面對應按鈕 DIV 元素
if (!audio) return; // 處理無效的按鍵事件
key.classList.add('playing'); // 改變樣式
audio.currentTime = 0; // 每次播放之后都使音頻播放進度歸零
audio.play(); // 播放相應音效
}
const keys = Array.from(document.querySelectorAll('.key')); // 獲取頁面所有按鈕元素
keys.forEach(key => key.addEventListener('transitionend', removeTransition)); // 添加 transition 事件監聽
window.addEventListener('keydown', playSound);
</script>
</body>
</html>
英文版本完整代碼：
<!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>
在線演示地址：http://demo.jb51.net/js/2017/JavaScript30/JavaScriptDrumKit/index-FINISHED.html
請在chrome瀏覽器下查看效果。
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