js 浮点数加、减、乘、除。

 1.浮点数加法运算
 ???function numAdd(arg1, arg2) {
 ???????var r1, r2, m;
 ???????try {
 ???????????r1 = arg1.toString().split(".")[1].length
 ???????} catch (e) {
 ???????????r1 = 0
 ???????}
 ???????try {
 ???????????r2 = arg2.toString().split(".")[1].length
 ???????} catch (e) {
 ???????????r2 = 0
 ???????}
 ???????m = Math.pow(10, Math.max(r1, r2));
 ???????return (arg1 * m + arg2 * m) / m;
 ???}

2.浮点数减法运算
 ???function FloatSub(arg1, arg2) {
 ???????var r1, r2, m, n;
 ???????try {
 ???????????r1 = arg1.toString().split(".")[1].length
 ???????} catch (e) {
 ???????????r1 = 0
 ???????}
 ???????try {
 ???????????r2 = arg2.toString().split(".")[1].length
 ???????} catch (e) {
 ???????????r2 = 0
 ???????}
 ???????m = Math.pow(10, Math.max(r1, r2));
 ???????//动态控制精度长度
// ???????n = (r1 = r2) ? r1 : r2;
 ???????return (arg1 * m - arg2 * m) / m;
 ???}

3.浮点数乘法运算
 ???function FloatMul(arg1, arg2) {
 ???????var m = 0, s1 = arg1.toString(), s2 = arg2.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);
 ???}


4.浮点数除法运算
 ???function FloatDiv(arg1, arg2) {
 ???????var t1 = 0, t2 = 0, r1, r2;
 ???????try {
 ???????????t1 = arg1.toString().split(".")[1].length
 ???????} catch (e) {
 ???????}
 ???????try {
 ???????????t2 = arg2.toString().split(".")[1].length
 ???????} catch (e) {
 ???????}
 ???????with (Math) {
 ???????????r1 = Number(arg1.toString().replace(".", ""));
 ???????????r2 = Number(arg2.toString().replace(".", ""));
 ???????????return (r1 / r2) * pow(10, t2 - t1);
 ???????}
 ???}

js 浮点数加、减、乘、除。

原文地址：https://www.cnblogs.com/lxjy201832/p/9254836.html