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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>JS Drum Kit</title>
<link rel="stylesheet" href="style.css">
</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() {
//keypress: keycode不一致，先不考慮
// window.addEventListener('keypress', function(e) {
// console.log("keypress" + e);
// })
//keyup:適合單一執行
// window.addEventListener('keyup', function(e) {
// console.log("keyup" + e);
// })
//keydown:容許重複執行
window.addEventListener('keydown', function(e) {
let button =
document.querySelector(
`.key[data-key="${e.keyCode.toString()}"]`
);
let audio =
document.querySelector(
`audio[data-key="${e.keyCode.toString()}"]`
);
if (button) {
if (button.classList.contains("down")) return false;
button.classList.add("playing");
button.classList.add("down");
}
if (audio) {
//聲音播放位置歸零
audio.currentTime = 0;
audio.play();
}
})
window.addEventListener('keyup', function(e) {
let button =
document.querySelector(
`.key[data-key="${e.keyCode.toString()}"]`
);
if (button) {
button.classList.remove("down");
}
})
//取出來的很像是陣列的變數
let keys = document.querySelectorAll(".key");
keys.forEach(function(key) {
//如果css有下transition的方法:transition結束都會執行一次
key.addEventListener("transitionend", function(e) {
if (e.propertyName === "transform") {
this.classList.remove("playing");
}
})
})
})()
</script>
</body>
</html>
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