我有一個程序，它使用 Web Audio API 來可視化音頻的時域波形。它在 Atom 中工作正常，我使用“harmsk”的“atom-html-preview”包，但它不能在 Chrome 或 JSFiddle 中運(yùn)行。我做錯了什么？是語法錯誤還是我使用了過時的函數(shù)？編輯：它也適用于“jas-chen”的“atom-live-server”在 Atom 中，輸出如下所示let frequencyArray = [];let analyser;let request;var flag=0;var height=0;const canvas = document.getElementById("myCanvas");const ctx = canvas.getContext("2d");const bars = Math.round(canvas.width);const lineWidth = 3;var centerX = canvas.width / 2;var centerY = canvas.height / 2;const audio = new Audio();audio.src =  "https://s3.us-west-2.amazonaws.com/storycreator.uploads/ck9kpb5ss0xf90132mgf8z893?client_id=d8976b195733c213f3ead34a2d95d1c1";audio.crossOrigin = "anonymous";audio.load();const context = new (window.AudioContext || window.webkitAudioContext)();analyser = context.createAnalyser();const source = context.createMediaElementSource(audio);source.connect(analyser);analyser.connect(context.destination);frequencyArray = new Uint8Array(analyser.frequencyBinCount);  function begin()  {    audio.play();    requestAnimationFrame(drawCanvas);  };  function end()  {    cancelAnimationFrame(request);    audio.pause();  };audio.addEventListener("ended", close);function close(){  if(flag==0)  {    flag=1;  }  else  {      ctx.clearRect(0, 0, canvas.width, canvas.height);      flag=0;  }}  const drawCanvas = () => {      ctx.clearRect(0, 0, canvas.width, canvas.height);      analyser.getByteTimeDomainData(frequencyArray);      for (var i = 0; i < bars; i+=5) {       height = frequencyArray[i] * 0.25;        drawLine(          {            i,            bars,            height          },          canvas,          ctx        );      }      if(flag==0)      {      request = requestAnimationFrame(drawCanvas);      }      else      {        flag=2;        close();      }  };