JS processing data rounding (detailed explanation of the difference between tofixed and round)

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1, tofixed method

toFixed() method can round the Number to the specified number The number of decimal places. For example, if the data Num is kept to 2 decimal places, it is expressed as: toFixed(Num); however, the rounding rules are different from those in mathematics. The banker's rounding rule is used, Banker's rounding: The so-called banker's rounding method is essentially a method of rounding to five and leaving even (also known as rounding to five and leaving even). The specific rules are as follows:

To put it simply: consider rounding up to five, if it is non-zero after five, add one, if it is zero after five, it will look at odd or even, if it is even before five, it should be discarded , It’s strange to make one more step before five.

Obviously this rule does not conform to the way we usually deal with data. In order to solve this problem, you can customize the implementation using the Math.round method to specify how many bits of data to retain for processing.

2, round method

round() method can round a number to the nearest integer. For example: Math.round(x) takes x to the nearest integer. The rounding method is used in the rounding method, which conforms to the rules of rounding in mathematics. The processing of decimals is not so convenient, but it can be customized according to different requirements.

For example: To process X with two decimal places, you can use Math.round(X * 100) / 100. for processing.

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