pinch事件测试

触发事件

var $box = $( '#box' ),
	$btn = $( '#btn' ),
	log = $( '#log' )[0];

$box.on( 'pinch', function(e){
	log.innerHTML += (e.type+"<br/>");
});

$btn.on( 'click', function(){
	$box.off( 'pinch' );
});