javascript - slider 更改网络音频增益，但仍然可以听到音频

Question

正在做 mozilla 教程。当我移动 slider 时，即使 GainNode.gain.value 变为零，音量也不会下降。

HTML

<input type="range" id="volume" min="0" max="2" value="1" step="0.01">

<audio src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/858/outfoxing.mp3" crossorigin="anonymous" id="basic-audio"></audio>

JavaScript

const volumeSlider = document.getElementById('volume');

const audioElement = document.getElementById('basic-audio');

const AudioContext = window.AudioContext || window.webkitAudioContext;

const audioContext = new AudioContext();

const track = audioContext.createMediaElementSource(audioElement);

track.connect(audioContext.destination);

const gainNode = audioContext.createGain();

track.connect(gainNode).connect(audioContext.destination);

volumeSlider.addEventListener('input', function() {
  gainNode.gain.value = this.value;
  console.log(gainNode.gain.value);
}, false);

Answer 1

我知道这是一个愚蠢的问题。

而不是

track.connect(audioContext.destination);

然后

track.connect(gainNode).connect(audioContext.destination);

只做一次

track.connect(gainNode).connect(audioContext.destination);