浮数数学题加减“重复”

Question

var a = 3.94
var b = 0.5
var r = a + b
console.log(r) //4.4399999999999995

var a = 4.22
var b = 0.5
var r = a - b
console.log(r) //3.7199999999999998

Answer 1

多亏了@stakvino的建议，我想我想明白了。

告诉我你们的想法。

添加

var a = 3.94
var b = 0.5

var fixed = String(a)

if (fixed.indexOf('.') === -1) {
    fixed = 0;
}

else {
    fixed = fixed.split('.')
    fixed = fixed[1].length;
}



var r = (a + b).toFixed(fixed)
console.log(r)

var a = 4.22
var b = 0.5

var fixed = String(a)

if (fixed.indexOf('.') === -1) {
    fixed = 0;
}

else {
    fixed = fixed.split('.')
    fixed = fixed[1].length;
}



var r = (a - b).toFixed(fixed)
console.log(r)