round()round()

• 09/30/2020
• • o
  • v

返回舍入到指定精度的源。Returns the rounded source to the specified precision.

语法Syntax

round(source [, Precision ])round(source [, Precision ])

参数Arguments

• source ：计算舍入时基于的源标量。source : The source scalar the round is calculated on.
• 精度 ：源将舍入到的位数（默认值为 0）。Precision : Number of digits the source will be rounded to.(default value is 0)

返回Returns

舍入到指定精度的源。The rounded source to the specified precision.

Round 与 bin()/floor() 的不同之处在于，前者将数字舍入到特定的位数，后者将值舍入到给定 bin 大小的整数倍（round(2.15, 1) 返回 2.2，而 bin(2.15, 1) 则返回 2）。Round is different than bin()/floor() in that the first rounds a number to a specific number of digits while the last rounds value to an integer multiple of a given bin size (round(2.15, 1) returns 2.2 while bin(2.15, 1) returns 2).

示例Examples

round(2.15, 1)                   // 2.2
round(2.15) (which is the same as round(2.15, 0))                   // 2
round(-50.55, -2)                   // -100
round(21.5, -1)                   // 20