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floatOperation.js
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68 lines (64 loc) · 1.46 KB
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"use strict"
// 两个浮点数求和
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;
return Math.round(num1*m+num2*m)/m;
}
// 两个浮点数相减
function accSub(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 (Math.round(num1*m-num2*m)/m).toFixed(n);
}
// 两数相除
function accDiv(num1,num2){
var t1,t2,r1,r2;
try{
t1 = num1.toString().split('.')[1].length;
}catch(e){
t1 = 0;
}
try{
t2=num2.toString().split(".")[1].length;
}catch(e){
t2=0;
}
r1=Number(num1.toString().replace(".",""));
r2=Number(num2.toString().replace(".",""));
return (r1/r2)*Math.pow(10,t2-t1);
}
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);
}
module.exports = {
accAdd,
accSub,
accDiv,
accMul
};