js 精确计算(加减乘除)

• 工具类CalcUtil.js

class CalcUtil {// 两数相加calcAdd(num1, num2) {var r1, r2, m;try {r1 = num1.toString().split('.')[1].length;} catch (e) {r1 = 0;}try {r2 = num2.toString().split('.')[1].length;} catch (e) {r2 = 0;}m = Math.pow(10, Math.max(r1, r2));return (num1 * m + num2 * m) / m;}// 两数相减calcSub(num1, num2) {var r1, r2, m, n;try {r1 = num1.toString().split('.')[1].length;} catch (e) {r1 = 0;}try {r2 = num2.toString().split('.')[1].length;} catch (e) {r2 = 0;}m = Math.pow(10, Math.max(r1, r2));n = r1 >= r2 ? r1 : r2;return ((num1 * m - num2 * m) / m).toFixed(n);}// 两数相乘calcMult(num1, num2) {var m = 0,s1 = num1.toString(),s2 = num2.toString();try {m += s1.split('.')[1].length;} catch (e) {}try {m += s2.split('.')[1].length;} catch (e) {}return (Number(s1.replace('.', '')) * Number(s2.replace('.', ''))) / Math.pow(10, m);}// 两数相除calcDiv(num1, num2) {var t1 = 0,t2 = 0,r1,r2;try {t1 = num1.toString().split('.')[1].length;} catch (e) {}try {t2 = num2.toString().split('.')[1].length;} catch (e) {}r1 = Number(num1.toString().replace('.', ''));r2 = Number(num2.toString().replace('.', ''));return (r1 / r2) * Math.pow(10, t2 - t1);}
}export default new CalcUtil();