aaac7fed
 liuqimichale
add
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
'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
|
