js使用while语句和do-while语句计算数列1+32!+53!+74!+……的前20项和.var i = 1var j = 1var sum1 = 0var sum2 = 0do-while语句do { sum1 += (2 * i - 1) i i++} while (i <= 20)docum2023-03-04JavaScript300