JavaScript 实现页面中录音功能

const recordBtn = document.querySelector(".record-btn");
const playBtn = document.querySelector(".play-btn");

if (navigator.mediaDevices.getUserMedia) {
  var chunks = [];
  const constraints = { audio: true };
  navigator.mediaDevices.getUserMedia(constraints).then(
    stream => {
      console.log("授权成功！");

      const mediaRecorder = new MediaRecorder(stream);

      recordBtn.onclick = () => {
        if (mediaRecorder.state === "recording") {
          mediaRecorder.stop();
          recordBtn.textContent = "record";
          console.log("录音结束");
        } else {
          mediaRecorder.start();
          console.log("录音中...");
          recordBtn.textContent = "stop";
        }
        console.log("录音器状态：", mediaRecorder.state);
      };

      mediaRecorder.ondataavailable = function(e) {
        chunks.push(e.data);
      };
    },
    () => {
      console.error("授权失败！");
    }
  );
} else {
  console.error("浏览器不支持 getUserMedia");
}