The classic precision loss case
0.3 - 0.1 // 0.19999999999999998
Howerver, if we only calculate number of two decimal places and use toFixed(2), did it is hava a risk?
(0.3 - 0.1).toFixed(2) // '0.20'
You can end up getting weird rounding behavior. Maybe don't use it for money
console.log((0.3 - 0.005).toFixed(2))//should be .29 console.log(Math.round((0.3 - 0.005)*100)/100)//should be .3(0)
You can use big.js to solve, it is only 24.4kb