$(function() {
	var time = 4; //进度条时间，以秒为单位，越小越快
	var $progressBar, $bar, $elem, isPause, tick, percentTime;
	$('#owl-demo').owlCarousel({
		navigation: true,
		navigationText: ['', ''],
		slideSpeed: 500,
		paginationSpeed: 500,
		singleItem: true,
		afterInit: progressBar,
		afterMove: moved,
		startDragging: pauseOnDragging
	});

	function progressBar(elem) {
		$elem = elem;
		buildProgressBar();
		start();
	}

	function buildProgressBar() {
		$progressBar = $('<div>', {
			id: 'progressBar'
		});
		$bar = $('<div>', {
			id: 'bar'
		});
		$progressBar.append($bar).insertAfter($elem.children().eq(0));
	}

	function start() {
		percentTime = 0;
		isPause = false;
		tick = setInterval(interval, 10);
	}

	function interval() {
		if(isPause === false) {
			percentTime += 1 / time;
			$bar.css({
				width: percentTime + '%'
			});
			if(percentTime >= 100) {
				$elem.trigger('owl.next')
			}
		}
	}

	function pauseOnDragging() {
		isPause = true;
	}

	function moved() {
		clearTimeout(tick);
		start();
	}
	$elem.on('mouseover', function() {
		isPause = true;
	})
	$elem.on('mouseout', function() {
		isPause = false;
	});
});