<script src="https://player.vimeo.com/api/player.js"></script>
<script>
var swiper = new Swiper('.swiper-container', {
	loop: true,
	effect: 'fade',
	pagination: {
		el: '.swiper-pagination',
		type: 'fraction',
	},
	navigation: {
		nextEl: '.swiper-button-next',
		prevEl: '.swiper-button-prev',
	},
    on: {
        slideChangeTransitionStart: function () {
            var iframe = document.querySelector('.swiper-slide-active iframe');
            var player = new Vimeo.Player(iframe);
            player.play().then(function() {
                console.log('play success');
            }).catch(function(error) {
                console.log('play failed');
            });
            var iframe2 = document.querySelectorAll('.swiper-wrapper .swiper-slide:not(.swiper-slide-active) iframe');
            for (var i=0; i<iframe2.length; i++) {
                var player = new Vimeo.Player(iframe2[i]);
                player.unload().then(function() {
                    console.log('unload success');
                }).catch(function(error) {
                    console.log('unload failed');
                });
            }
        },
    }
});
</script>