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'use strict' var abs = Math.abs var round = Math.round function almostEq(a, b) { return abs(a - b) <= 9.5367432e-7 } //最大公约数 Greatest Common Divisor function GCD(a, b) { if (almostEq(b, 0)) return a return GCD(b, a % b) } function findPrecision(n) { var e = 1 while (!almostEq(round(n * e) / e, n)) { e *= 10 } return e } function num2fraction(num) { if (num === 0 || num === '0') return '0' if (typeof num === 'string') { num = parseFloat(num) } var precision = findPrecision(num) //精确度 var number = num * precision var gcd = abs(GCD(number, precision)) //分子 var numerator = number / gcd //分母 var denominator = precision / gcd //分数 return round(numerator) + '/' + round(denominator) } module.exports = num2fraction