Jquery中给animation加更多的运作效果实例

            var c = firstNum + diff;
            var inv = this.bounceEaseOut(1 - p, 1, 0, diff);
            return c - inv + firstNum;
        },
        bounceEaseOut: function (p, n, firstNum, diff) {
            var c = firstNum + diff;

            if (p < (1 / 2.75)) {
                return c * (7.5625 * p * p) + firstNum;
            }
            else if (p < (2 / 2.75)) {
                return c * (7.5625 * (p -= (1.5 / 2.75)) * p + .75) + firstNum;
            }
            else if (p < (2.5 / 2.75)) {
                return c * (7.5625 * (p -= (2.25 / 2.75)) * p + .9375) + firstNum;
            }
            else {
                return c * (7.5625 * (p -= (2.625 / 2.75)) * p + .984375) + firstNum;
            }
        },
        // ******* circ
        circEaseIn: function (p, n, firstNum, diff) {
            var c = firstNum + diff;
            return -c * (Math.sqrt(1 - (p /= 1) * p) - 1) + firstNum;
        },
        circEaseOut: function (p, n, firstNum, diff) {
            var c = firstNum + diff;
            return c * Math.sqrt(1 - (p = p / 1 - 1) * p) + firstNum;
        },
        circEaseInOut: function (p, n, firstNum, diff) {
            var c = firstNum + diff;
            if ((p /= 0.5) < 1)
                return -c / 2 * (Math.sqrt(1 - p * p) - 1) + firstNum;
            else
                return c / 2 * (Math.sqrt(1 - (p -= 2) * p) + 1) + firstNum;
        },
        // ******* cubic
        cubicEaseIn: function (p, n, firstNum, diff) {
            var c = firstNum + diff;
            return c * (p /= 1) * p * p + firstNum;
        },
        cubicEaseOut: function (p, n, firstNum, diff) {
            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;
            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;
     &nb