Jquery中给animation加更多的运作效果实例

            var c = firstNum + diff;
            return c * ((p = p / 1 – 1) * p * p + 1) + firstNum;
        },
        cubicEaseInOut: function (p, n, firstNum, diff) {
            var c = firstNum + diff;
            if ((p /= 0.5) < 1)
                return c / 2 * p * p * p + firstNum;
            else
                return c / 2 * ((p -= 2) * p * p + 2) + firstNum;
        },
        // ******* elastic
        elasticEaseIn: function (p, n, firstNum, diff) {
            var c = firstNum + diff;
            if (p == 0) return firstNum;
            if (p == 1) return c;
            var peroid = 0.25;
            var s;
            var amplitude = c;
            if (amplitude < Math.abs(c)) {
                amplitude = c;
                s = peroid / 4;
            }
            else {
                s = peroid / (2 * Math.PI) * Math.asin(c / amplitude);
            }
            return -(amplitude * Math.pow(2, 10 * (p -= 1)) * Math.sin((p * 1 – s) * (2 * Math.PI) / peroid)) + firstNum;
        },
        elasticEaseOut: function (p, n, firstNum, diff) {
            var c = firstNum + diff;
            if (p == 0) return firstNum;
            if (p == 1) return c;
            var peroid = 0.25;
            var s;