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This article mainly introduces "how js achieves rounding and retains 2 decimal places". In daily operation, I believe many people have doubts about how js achieves rounding to retain 2 decimal places. Xiaobian consulted all kinds of data and sorted out simple and easy-to-use operation methods. I hope it will be helpful for you to answer the doubts of "how js achieves rounding to retain 2 decimal places". Next, please follow the editor to study!

Method 1: use the toFixed () method

ToFixed (n): rounds a number according to the banker's rounding rule, that is, rounding to retain n decimal places.

Example: rounding to retain 2 decimal places

Var a = 22.3344//undefineda.toFixed (2) / / "22.33" a = 22.3355//22.3355a.toFixed (2) / / "22.34"

Method 2: use the Math.round method

Math.round: rounds a number to its nearest integer, > = 0.5

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