var wavesurfer = WaveSurfer.create({
    container: '#waveform',
    waveColor: 'violet',
    progressColor: 'purple'
});
wavesurfer.on('ready', function () {
    wavesurfer.play();
});
let audio = document.getElementById('audio');
let file_path = audio.src;
wavesurfer.load(file_path);