source: trip-planner-front/node_modules/num2fraction/index.js@ 6fe77af

Last change on this file since 6fe77af was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

  • Property mode set to 100644
File size: 804 bytes
Line 
1'use strict'
2
3var abs = Math.abs
4var round = Math.round
5
6function almostEq(a, b) {
7 return abs(a - b) <= 9.5367432e-7
8}
9
10//最大公约数 Greatest Common Divisor
11function GCD(a, b) {
12 if (almostEq(b, 0)) return a
13 return GCD(b, a % b)
14}
15
16function findPrecision(n) {
17 var e = 1
18
19 while (!almostEq(round(n * e) / e, n)) {
20 e *= 10
21 }
22
23 return e
24}
25
26function num2fraction(num) {
27 if (num === 0 || num === '0') return '0'
28
29 if (typeof num === 'string') {
30 num = parseFloat(num)
31 }
32
33
34 var precision = findPrecision(num) //精确度
35 var number = num * precision
36 var gcd = abs(GCD(number, precision))
37
38 //分子
39 var numerator = number / gcd
40 //分母
41 var denominator = precision / gcd
42
43 //分数
44 return round(numerator) + '/' + round(denominator)
45}
46
47module.exports = num2fraction
48
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