在 JavaScript 中释放按键时如何停止声音 [英] how do i stop a sound when a key is released in JavaScript

问题描述

我正在为我和我的朋友编写一个全气喇叭钢琴(我知道这有点愚蠢)，我必须完成所有的键绑定，然后我遇到了这个问题，当我松开按键时声音不会停止被按下以激活它.

i am coding a full air horn piano for me and my friends (kind of dumb i know) and i got to doing all the key binds and then i ran into this problem, the sounds wont stop when i release the key that was pressed to activate it.

这是我目前在 .js 文件中的内容(到目前为止只输入了一个声音):

here is what i have so far in the .js file(just one sound put in so far):

function startAnatural(){

var A = new Audio("A natural.mp3"); 
A.play();

}

function stopAnatural(){
var A = new Audio("A natural.mp3");

A.pause();
A.currentTime = 0;;

}

document.onkeydown = function(e){
    e = e || window.event;
    var key = e.which || e.keyCode;
    if(key===81){
        startAnatural();
    }
};

document.onkeyup = function(e){
    e = e || window.event;
    var key = e.which || e.keyCode;
    if(key===81){
        stopAnatural();
    }

};

推荐答案

您正在创建相同声音的新实例并暂停它，而原始实例继续播放.

You're creating a new instance of the same sound and pausing it, whilst the original instance carries on playing.

相反，两个函数都需要引用同一个 Audio 对象.

Instead, both functions need to have a reference to the same Audio object.

也许这样的设计更适合你.

Maybe a design like this would work better for you.

function createSound(file) {
  var sound = new Audio(file);

  return {
    start: function() {
      sound.play();
    },
    stop: function() {
      sound.pause();
      sound.currentTime = 0;
    }
  };
}

此函数采用您要加载的声音的名称，然后返回用于启动和停止它的另外两个函数.这两个函数将始终引用同一个 Audio 实例.

This function takes the name of a sound you want to load, then returns two other functions for starting and stopping it. Both functions will always refer to the same Audio instance.

var aNatural = createSound('A natural.mp3');

document.onkeydown = function() {
  // ...
  aNatural.start();
  // ...
}

document.onkeyup = function() {
  // ...
  aNatural.stop();
  // ...
}

<小时>

如果您想组织所有声音，您需要根据相应的键码存储声音.

---

If you want to organize all of your sounds, you'll want to store the sounds against the corresponding keycodes.

var notes = [
  { key: 81, sound: createSound('A natural.mp3') },
  { key: 82, sound: createSound('B natural.mp3') },
  { key: 83, sound: createSound('C natural.mp3') }
  // ...
];

然后您可以创建事件侦听器，使用适当的键代码触发每个声音.

Then you can create event listeners trigger each sound with the appropriate key code.

document.onkeydown = function() {
  var pressedKey = e.which;

  notes.forEach(function(note) {
    if(note.key === pressedKey) {
      note.sound.start();
    }
  });
}

// do the same for keyup
// ...

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