浏览器上录音Js代码

const recordBtn = document.querySelector(".record-btn")
    const player = document.querySelector(".audio-player")
    const download = document.querySelector('#download')
    if (navigator.mediaDevices.getUserMedia) {
        let chunks = []
        const constraints = { audio: true }
        navigator.mediaDevices.getUserMedia(constraints).then(
            stream => {
                const mediaRecorder = new MediaRecorder(stream)
                recordBtn.onclick = () => {
                    if (mediaRecorder.state === "recording") {
                        mediaRecorder.stop()
                        recordBtn.textContent = "录音结束"
                    } else {
                        mediaRecorder.start()
                        recordBtn.textContent = "录音中..."
                    }
                }
                mediaRecorder.ondataavailable = e => {
                    chunks.push(e.data)
                }
                mediaRecorder.onstop = e => {
                    const blob = new Blob(chunks, { type: "audio/ogg; codecs=opus" })
                    chunks = []
                    const audioURL = window.URL.createObjectURL(blob)
                    player.src = audioURL
                    download.innerHTML = '下载'
                    download.href = audioURL
                }
            },
            () => {
                console.error("授权失败！");
            }
        );
    } else {
        console.error("浏览器不支持 getUserMedia");
    }