js高精度计算npm包

Why

0.1 + 0.2 = 0.30000000000000004
1.0 - 0.9 = 0.09999999999999998
0.105.toFixed(2) = 0.1 // not 0.11

注意传参传null。会报错 最好数值类型的参数

• https://npmmirror.com/package/number-precision