问我想使用javascript录制音频输入并将其保存到磁盘

EN

  function saveBlob(blob, fileName) {
      var a = document.createElement("a");
      document.body.appendChild(a);
      a.style = "display: none";
      
      var url = window.URL.createObjectURL(blob);
      a.href = url;
      a.download = fileName;
      a.click();
      window.URL.revokeObjectURL(url);
  }

  function startRecording(){

    var device = navigator.mediaDevices.getUserMedia({audio:true});
    var items = [];
    device.then( stream => {
      var recorder = new MediaRecorder(stream);
      recorder.ondataavailable = e => {

        items.push(e.data);
        if(recorder.state == "inactive")
        {
          var blob = new Blob(items, {type: 'audio/wav'});
          alert(blob.type);
          saveBlob(blob, 'myRecording.wav');
        }
      }

      recorder.start();
      setTimeout(()=>{
        recorder.stop();
      }, 4000);

    });