如何完全销毁AudioContext对象和BufferNode对象（包括其缓冲区）

Question

此代码可以正确吗？有什么好主意吗？ “ this.http”是一个ajax lib对象，因此不必在意。 “ res”是从服务器请求的音频数据。

window['AudioContext'] = window['AudioContext'] || window['webkitAudioContext']
        this.http.get(audio.sourceUrl, {
            responseType: 'arraybuffer'
        }).subscribe((res) => {
            if (this.source) {
                this.source.disconnect(0)
                this.source.buffer = null
            }
            if (this.audioCtx) {
                this.audioCtx.close()
            }

            this.audioCtx = new AudioContext()

            this.audioCtx.decodeAudioData(res, (buffer) => {
                this.source = this.audioCtx.createBufferSource() // creates a sound source
                this.source.buffer = buffer                    // tell the source which sound to play
                this.source.connect(this.audioCtx.destination)       // connect the source to the context's destination (the speakers)
                this.source.start(0)
            }, this.onError)
        })

我见过这样的人的代码，但我不知道他为什么这样尝试：

var ctx = new AudioContext(),
    scratchBuffer = ctx.createBuffer(1, 1, 22050);

    class WebAudioAdapter extends AudioAdapter {
        close() {
            if( this.__src ) {
                this.__src.onended = null;
                this.__src.disconnect(0);
                try { this.__src.buffer = scratchBuffer; } catch(e) {}
                this.__src = null;
            }
        }
    }