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);更多推荐
为什么我们需要使用基数?
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