var tag = document.createElement('script');


tag.src = "https://www.youtube.com/iframe_api";
var firstScriptTag = document.getElementsByTagName('script')[0];
firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);


function onYouTubeIframeAPIReady() {
  new YT.Player('player', {
    videoId: 'ys1gfUyZkcM',
    playerVars:{
        autoplay:1,
        loop: true,
        playlist: 'ys1gfUyZkcM',
    },
    events:{
        onReady: function(event){
            event.target.mute(); //¼Ò¸® ²ô±â
        }
    }
  });
}