为什么我们需要使用基数？ [英] Why do we need to use radix?

问题描述

radix究竟意味着什么？我们为什么需要它？

What does radix actually means? Why do we need it?

parseInt(10, radixValue); 

推荐答案

您可能并不总是想要将整数解析为基数为10的数字，因此提供基数允许您指定其他数字系统。

You might not always want to parse the integer into a base 10 number, so supplying the radix allows you to specify other number systems.

基数是单个数字的值的数量。十六进制将是16.八进制将是8，二进制将是2，依此类推...

The radix is the number of values for a single digit. Hexidecimal would be 16. Octal would be 8, Binary would be 2, and so on...

在 parseInt（）功能，你可以做几件事来暗示基数而不提供它。如果用户输入的字符串与其中一个规则匹配但不明确表示，则这些也可能对您不利。例如：

In the parseInt() function, there are several things you can do to hint at the radix without supplying it. These can also work against you if the user is entering a string that matches one of the rules but doesn't expressly mean to. For example:

// Numbers with a leading 0 used a radix of 8 (octal) before ECMAScript 5.
// These days, browsers will treat '0101' as decimal.
var result = parseInt('0101');

// Numbers that start with 0x use a radix of 16 (hexidecimal)
var result = parseInt('0x0101');

// Numbers starting with anything else assumes a radix of 10
var result = parseInt('101');

// Or you can specify the radix, in this case 2 (binary)
var result = parseInt('0101', 2);

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