本地文件播放

          async    play() {
                let upload = document.getElementById("file1");
                let f = upload.files[0];
              var ctx = new AudioContext();
                var source = ctx.createBufferSource();
        var data = f.slice(0);
        let v = await data.arrayBuffer();
        console.log(v);

        ctx.decodeAudioData(v).then(function (decodeData) {
          source.buffer = decodeData;
          source.connect(ctx.destination);
          source.start(0);
        });