fly.js抛物线连续不断加入购物车

HTML

<div class="m-sidebar">
    <div class="cart">
        <i id="end">
        </i>
        <span>
            购物车
        </span>
    </div>
</div>

jQuery

$('html,body').on('click', addProduct);
function addProduct(event) {
    var offset = $('#end').offset(),
    flyer = $('<img class="u-flyer" src="images/profile-80_1.jpg"/>');
    flyer.fly({
        start: {
            left: event.pageX,
            top: event.pageY
        },
        end: {
            left: offset.left,
            top: offset.top,
            width: 20,
            height: 20
        }
    });
}