test.html

<!DOCTYPE html>
<html lang="zh-cn">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0"/>
    <meta name="format-detection" content="telephone=no"/>
    <title>8-bit Noise Test</title>
</head>
<body>
<h1>8位噪波测试</h1>
<div id="root"></div>
<script src="8bitNoise.js"></script>
<script>
    (function () {
        var AudioContext = window.AudioContext || window.webkitAudioContext || window.mozAudioContext;
        var ctx = new AudioContext();
        var node;
        function start(freq) {
            if (node) {
                stop();
            }
            node = ctx.create8bitNoise(freq);
            node.connect(ctx.destination);
            node.start(0);
        }
        function stop() {
            if (node) {
                node.stop(0);
            }
        }
        var btn;
        var root = document.getElementById('root');
        for (var i = 1; i <= 16; i ++) {
            btn = document.createElement('button');
            btn.innerHTML = '噪波' + i;
            btn.onmousedown = (function (f) {
                return function () {
                    start(f);
                }
            })(i);
            root.appendChild(btn);
        }
        document.onmouseup = function () {
            stop();
        };
    })();
</script>
</body>
</html>