JS Precision Arithmetic

Because JS multiplication and add and subtract operations sometimes have the problem of loss of precision, at the same time, two non-numeric addition will also appear the problem of type conversion, so specifically wrote a arithmetic JS not lost precision version to deal with JS arithmetic.

    /** * Exact addition * * @param {String | Number} Arg1 * @param {String | Number} arg2 * * @returns {number} arg1 + arg2 */Exports.add = function add(arg1, arg2) {        //Digitization        varNUM1 =parsefloat(ARG1);varnum2 =parsefloat(ARG2);varR1, 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 (Ten,Math. Max (R1, r2));return(NUM1 * m + num2 * m)/m; };/** * Exact subtraction * * @param {number | String} arg1 * @param {number | String} arg2 * * @returns {number} arg1-arg2 */Exports.sub = function sub(arg1, arg2) {        //Digitization        varNUM1 =parsefloat(ARG1);varnum2 =parsefloat(ARG2);varR1, 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 (Ten,Math. Max (R1, r2));return((NUM1 * m-num2 * m)/m); };/** * Exact multiplication * * @param {number | String} arg1 * @param {number | String} arg2 * @returns {number} arg1 * arg2s * *Exports.mul = function mul(arg1, arg2) {        //Digitization        varNUM1 =parsefloat(ARG1);varnum2 =parsefloat(ARG2);varm =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 (Ten, m); };/** * Exact Division * * @param {number | String} arg1 * @param {number | String} arg2 * @returns {Number} */Exports.div = function div(arg1, arg2) {        //Digitization        varNUM1 =parsefloat(ARG1);varnum2 =parsefloat(ARG2);varT1 =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 (Ten, T2-T1); };

Students who need it can get their own.

For more information, please see Zakwu's small station.

JS Precision Arithmetic