How to shuffle playlist in javascript?

Question

I'm currently creating a playlist and I got confused over the shuffle function. How do I shufffle it?

function loadTrack(track_index) {
  // Clear the previous seek timer
  clearInterval(updateTimer);
  resetValues();

  // Load a new track
  curr_track.src = track_list[track_index].path;
  curr_track.load();

  // Update details of the track
  track_art.style.backgroundImage =
    "url(" + track_list[track_index].image + ")";
  track_name.textContent = track_list[track_index].name;
  track_artist.textContent = track_list[track_index].artist;
  now_playing.textContent =
    "PLAYING " + (track_index + 1) + " OF " + track_list.length;

  // Set an interval of 1000 milliseconds
  // for updating the seek slider
  updateTimer = setInterval(seekUpdate, 1000);

  // Move to the next track if the current finishes playing
  // using the 'ended' event
  curr_track.addEventListener("ended", nextTrack);

  // Apply a random background color
  random_bg_color();
}

function random_bg_color() {
  // Get a random number between 64 to 256
  // (for getting lighter colors)
  let red = Math.floor(Math.random() * 256) + 64;
  let green = Math.floor(Math.random() * 256) + 64;
  let blue = Math.floor(Math.random() * 256) + 64;
}

// Function to reset all values to their default
function resetValues() {
  curr_time.textContent = "00:00";
  total_duration.textContent = "00:00";
  seek_slider.value = 0;
}

function playpauseTrack() {
  // Switch between playing and pausing
  // depending on the current state
  if (!isPlaying) playTrack();
  else pauseTrack();
}

function playTrack() {
  // Play the loaded track
  curr_track.play();
  isPlaying = true;

  // Replace icon with the pause icon
  playpause_btn.innerHTML = '<i class="fa fa-pause-circle fa-5x"></i>';
}

function pauseTrack() {
  // Pause the loaded track
  curr_track.pause();
  isPlaying = false;

  // Replace icon with the play icon
  playpause_btn.innerHTML = '<i class="fa fa-play-circle fa-5x"></i>';
}
//-------
function nextTrack() {
  // Go back to the first track if the
  // current one is the last in the track list
  if (track_index < track_list.length - 1) track_index += 1;
  else track_index = 0;

  // Load and play the new track
  loadTrack(track_index);
  playTrack();
}

Hi there, I'm currently creating a playlist and I got confused over the shuffle function. How do I shufffle it? I can only use the array that contains elements until the song is played again and each song is hopped once.