Unsubscribe from all YouTube channels on current page

yt-unsub.js

var button = document.getElementsByClassName("subscribed-label");
for(var i=0;i<button.length;i++)
{
    button[i].click();
    var unsub = document.getElementsByClassName("overlay-confirmation-unsubscribe-button");
    //console.log(unsub.length)
    for(var j=0;j<unsub.length;j++)
      unsub[j].click();
}