Jquery中给animation加更多的运作效果实例

            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) * Math.sin((p * 1 – s) * (2 * Math.PI) / peroid)) + c;
        },
        // ******* expo
        expoEaseIn: function (p, n, firstNum, diff) {
            var c = firstNum + diff;
            return (p == 0) ? firstNum : c * Math.pow(2, 10 * (p – 1)) + firstNum – c * 0.001;
        },
        expoEaseOut: function (p, n, firstNum, diff) {
            var c = firstNum + diff;
            return (p == 1) ? c : diff * 1.001 * (-Math.pow(2, -10 * p) + 1) + firstNum;
        },
        expoEaseInOut: function (p, n, firstNum, diff) {
            var c = firstNum + diff;
            if (p == 0) return firstNum;
            if (p == 1) return c;
            if ((p /= 0.5) < 1)
                return c / 2 * Math.pow(2, 10 * (p – 1)) + firstNum – c * 0.0005;
            else
                return c / 2 * 1.0005 * (-Math.pow(2, -10 * –p) + 2) + firstNum;
        },
        // ******* quad
        quadEaseIn: function (p, n, firstNum, diff) {
            var c = firstNum + diff;
            return c * (p /= 1) * p + firstNum;