js代码

<script src="js/bootstrap-3.3.4.js"></script>
<script type="text/javascript">
	$(document).ready(function () {
	  var trigger = $('.hamburger'),
		  overlay = $('.overlay'),
		 isClosed = false;

		trigger.click(function () {
		  hamburger_cross();      
		});

		function hamburger_cross() {

		  if (isClosed == true) {          
			overlay.hide();
			trigger.removeClass('is-open');
			trigger.addClass('is-closed');
			isClosed = false;
		  } else {   
			overlay.show();
			trigger.removeClass('is-closed');
			trigger.addClass('is-open');
			isClosed = true;
		  }
	  }
	  
	  $('[data-toggle="offcanvas"]').click(function () {
			$('#wrapper').toggleClass('toggled');
	  });  
	});
</script>

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