Javascript solution to the loss of accuracy of decimal addition, subtraction, multiplication and division

In JS, add decimals, subtract decimals, divide decimals, multiply decimals. There will be a loss of accuracy. The following introduction, to solve the js addition, subtraction, multiplication and division precision loss problem.

Add in js:

function accAdd(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 
} 
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Subtraction in js

function Subtr(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); }Copy the code

Multiplication in JS

 function accMul(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) 
 } 
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Division in js

function accDiv(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){} with(Math){ r1=Number(num1.toString().replace(".","")) r2=Number(num2.toString().replace(".","")) return accMul((r1/r2),pow(10,t2-t1)); }}Copy the code