JavaScript 小数转分数

//精度为小数两位，提高精度可把 toFixed(2)和100同时修改；
function decimalsToFractional(decimals) {
	const formatDecimals = decimals.toFixed(2)
	let denominator = 100 //初始化分母
	let numerator = formatDecimals * 100 //初始化分子
	let bigger = 0

	function recursion() {
		bigger = denominator > numerator ? denominator : numerator
		for (let i = bigger; i > 1; i--) {
			if (Number.isInteger(numerator / i) && Number.isInteger(denominator / i)) {
				numerator = numerator / i
				denominator = denominator / i
				recursion()
			}
		}
	}
	recursion()
	if (decimals % 1 === 0) { // 入参为整数时 直接返回
		return `${decimals}`
	} else if (numerator / denominator > 1) {  // 分子大于分母 
		return `${parseInt(numerator / denominator)} + ${numerator % denominator} / ${denominator}`
	} else { // 分子小于分母
		return `${numerator} / ${denominator}`
	}
}
console.log(this.decimalsToFractional(1.5))    // 1/2
console.log(this.decimalsToFractional(20))     // 20
console.log(this.decimalsToFractional(5/2))    // 2+1/2