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Today, I would like to share with you how js realizes rounding to retain the relevant knowledge points of the two decimal places. The content is detailed and the logic is clear. I believe most people still know too much about this knowledge, so share this article for your reference. I hope you can get something after reading this article. Let's take a look at it.

1. Define

The toFixed () method rounds Number to a specified number of decimal places. For example, keeping the data Num to 2 decimal places is represented as: toFixed (Num); but unlike the rules in mathematics, the banker rounding rule is used. Banker rounding: the essence of the so-called banker rounding method is a kind of rounding five pairs (also known as rounding five pairs). The specific rules are as follows:

To put it simply: round six and five, five is not zero to enter one, five is zero to see parity, five before is even should give up, five before is strange to enter one.

two。 Grammar

Number.toFixed (x)

3. Parameter value

X, required. The specified number of decimal places is a value between 0 and 20, including 0 and 20, and some implementations can support a wider range of values. If this parameter is omitted, 0 will be used instead.

4. Return value

String with fixed x digits after the decimal point

5. Example

[xss_clean] ("JS keeps examples of two decimal places

); var axiom 2.1512131231231321; [xss_clean] ("original value:" + a + "

[xss_clean] ("two decimal places:" + a.toFixed (2) + "

Four decimal places "+ a.toFixed (4); these are all the contents of the article" how to round js to retain two decimal places ". Thank you for reading! I believe you will gain a lot after reading this article. The editor will update different knowledge for you every day. If you want to learn more, please follow the industry information channel.

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