这看起来并不像正确的方式使用的音频的构造函数HTMLAudioElement / <audio>$c$c>.

That doesn't look like the correct way to use the Audio constructor for HTMLAudioElement / <audio>.

轻微的调整

var snd = new Audio("data:audio/wav;base64," + base64string);
snd.play();

如果它工作在控制台，但不是在脚本中，它可能会越来越垃圾回收，在这种情况下，范围它，所以它会留

If it works in console but not in script, it may be getting garbage collected, in which case scope it so it will stay

var Sound = (function () {
    var df = document.createDocumentFragment();
    return function Sound(src) {
        var snd = new Audio(src);
        df.appendChild(snd); // keep in fragment until finished playing
        snd.addEventListener('ended', function () {df.removeChild(snd);});
        snd.play();
        return snd;
    }
}());
// then do it
var snd = Sound("data:audio/wav;base64," + base64string);