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console

            
//获取所有按键元素
const keys = Array.from(document.querySelectorAll('.key')); //返回一个数组
//遍历获取的所有按键，并监听这些按键上的'transitionend事件'
	keys.forEach(key => key.addEventListener('transitionend', removeTransition));//addEventListenner
//监听按键事件
window.addEventListener('keydown', playSound); //事件监听

function playSound(event) {
  //根据按键码获取对应音频
  const audio = document.querySelector(`audio[data-key = "${event.keyCode}"]`); //获取元素,注意和querySelectorAll区分
  //处理无效按键
  if (!audio) return;
  //播放音频
  audio.play();
  
  //获按键对应的div元素
  const key = document.querySelector(`div[data-key = "${event.keyCode}"]`);
  //改变当前div元素的样式
  key.classList.add('playing'); //Element.classList用于返回当前元素的class列表
}
function removeTransition(event){
  if(event.propertyName!=='transform')
    return;
  event.target.classList.remove('playing');
}


            
<!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>
  </body>
</html>

            
html {
  font-size: 10px;
  background: url(http://i.imgur.com/b9r5sEL.jpg) bottom center;
  background-size: cover;
}

body,
html {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
}

.keys {
  display: flex;
  flex: 1;
  min-height: 100vh;
  align-items: center;
  justify-content: center;
}

.key {
  border: 4px solid black;
  border-radius: 5px;
  margin: 1rem;
  font-size: 1.5rem;
  padding: 1rem .5rem;
  transition: all .07s;
  width: 100px;
  text-align: center;
  color: white;
  background: rgba(0, 0, 0, 0.4);
  text-shadow: 0 0 5px black;
}

.playing {
  transform: scale(1.1);
  border-color: #ffc600;
  box-shadow: 0 0 10px #ffc600;
}

kbd {
  display: block;
  font-size: 40px;
}

.sound {
  font-size: 1.2rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #ffc600;
}