无法在p5.js中获取麦克风输入

let audioContext;
let analyser;

function setup() {
  createCanvas(400, 400);
  
  audioContext = new AudioContext();
  
  navigator.mediaDevices.getUserMedia({ audio: true })
    .then(stream => {
      const source = audioContext.createMediaStreamSource(stream);
      analyser = audioContext.createAnalyser();
      source.connect(analyser);
    })
    .catch(error => {
      console.error('Error accessing microphone:', error);
    });
}

function draw() {
  background(220);
  
  if (analyser) {
    const dataArray = new Uint8Array(analyser.frequencyBinCount);
    analyser.getByteFrequencyData(dataArray);
    
    // 在这里处理音频数据并进行可视化
  }
}