我想通过JavaScript控制音量。
我发现了如何控制音频对象。
但是，我不知道如何控制音量设置。
你能告诉我如何通过JavaScript或一些好的模块来控制音量吗？
最佳答案
这是一些JavaScript，可为浏览器提供一个在渲染音频时更改音量的小部件...只需在下面进行更新，并使用一些音频文件(mp3)填充变量audio_url，即可将其放入与以下代码相同的目录中
<html>
<head>
<title>render audio with volume control</title>
</head>
<body>
<p>Volume</p>
<input id="volume" type="range" min="0" max="1" step="0.1" value="0.5"/>
<script>
var audio_context = null;
var gain_node = null;
window.AudioContext = window.AudioContext || window.webkitAudioContext;
audio_context = new AudioContext();
gain_node = audio_context.createGain(); // Declare gain node
gain_node.connect(audio_context.destination); // Connect gain node to speakers
function render_audio() {
var request = new XMLHttpRequest();
var audio_url = "your_music.mp3";
request.open('GET', audio_url, true); // loading local file for now
request.responseType = 'arraybuffer';
// Decode asynchronously
request.onload = function() {
audio_context.decodeAudioData(request.response, function(buffer) {
stored_buffer = buffer; // store buffer for replay later
var source = audio_context.createBufferSource(); // creates a sound source
source.buffer = buffer; // tell the source which sound to play
source.connect(gain_node); // connect source to speakers
source.start(0); // play the source now
});
};
request.send();
}
// --- enable volume control for output speakers
document.getElementById('volume').addEventListener('change', function() {
var curr_volume = this.value;
gain_node.gain.value = curr_volume;
console.log("curr_volume ", curr_volume);
});
// init
render_audio();
</script>
<body onkeypress="render_audio()">
<button onclick="render_audio()">play_again</button>
</body>
</html>
关于javascript - 如何通过JavaScript控制浏览器的音量？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/29205255/