我的代码不适用于此youtube网址。如何停止此iframe视频？
<iframe class="youtube-video1" src="https://www.youtube.com/embed/6VuiyCbZwhw?enablejsapi=1&version=3&playerapiid=ytplayer" width="853" height="461"></iframe>
<script>
$('.stop-video').click(function() {
$('.youtube-video1')[0].contentWindow.postMessage('{"event":"command","func":"' + 'pauseVideo' + '","args":""}', '*');
});
</script>