Reserving two decimal places problem – interception and rounding

1. ToFixed is rounded to two decimal places

ToFixed (2) == 1.33

2. Implement the two-digit decimal scheme

1. Regular match

// Truncate N decimal places (directly after discarding the specified number of digits); Number.prototype.cutFixed = function(digit = 2) { let reg = new RegExp(`^\\d+(? :\\.\\d{0,${digit}})? `); return Number(this.toString().match(reg)); }; (9.9999). CutFixed (2) = > 9.99Copy the code

2. Use math.floot (num * 100)/100

⚠️ In this scenario, math.floor () is prone to accuracy problems

Math. Floor (8.54 * 100) / 100 = > 8.53

3. String manipulation. With regular