jQuery抛物线动画代码，利用抛物线公式计算出html元素运动轨迹，适用于实现加入购物车动画效果，兼容IE7及以上浏览器。- jQuery animation code parabola, use the formula to calculate the parabolic trajectory of the html element, suitable for realizing ADD TO CART animation, and more compatible with IE7 br