bignumber.js

bignumber.js

下载地址：https://github.com/MikeMcl/bignumber.js/releases

为了解决精度丢失的问题

安装： npm install bignumber.js

import BigNumber from "bignumber.js"
// 相乘  参数:dec 保留小数 
accFloatMul(num1, num2, dec) {
			let res =new BigNumber(num1).multipliedBy(new BigNumber(num2)).toFixed(dec)

			if (dec) {
				const numArr = String(res).split('.')
				// 获取当输入小数位数
				const decimal = numArr[1] || ''

				if (decimal === '0'.repeat(dec)) {
					res =new BigNumber(res).toFixed(0)
				}
			}

			return res
		}
// 相加
accFloatAdd(num1, num2, dec) {
			let res =new BigNumber(num1).plus(new BigNumber(num2)).toFixed(dec)

			if (dec) {
				const numArr = String(res).split('.')
				// 获取当输入小数位数
				const decimal = numArr[1] || ''

				if (decimal === '0'.repeat(dec)) {
					res =new BigNumber(res).toFixed(0)
				}
			}

			return res
		}
// 相减
accFloatSub(num1, num2, dec) {
			let res =new BigNumber(num1).minus(new BigNumber(num2)).toFixed(dec)

			if (dec) {
				const numArr = String(res).split('.')
				// 获取当输入小数位数
				const decimal = numArr[1] || ''

				if (decimal === '0'.repeat(dec)) {
					res =new BigNumber(res).toFixed(0)
				}
			}

			return res
		}
// 相除
accFloatDiv(num1, num2, dec) {
			let res =new BigNumber(num1).dividedBy(new BigNumber(num2)).toFixed(dec)

			if (dec) {
				const numArr = String(res).split('.')
				// 获取当输入小数位数
				const decimal = numArr[1] || ''

				if (decimal === '0'.repeat(dec)) {
					res =new BigNumber(res).toFixed(0)
				}
			}

			return res
		}