如何在JavaScript中将数字的二进制表示形式从字符串转换为整数? [英] How to convert binary representation of number from string to integer number in JavaScript?

问题描述

有人可以给我一点建议吗?

Can anybody give me a little advice please?

我有一个字符串，例如"01001011"，我需要做的是将其反转，因此我使用的是.split('')而不是.reverse()，现在我需要将数组读取为字符串并将其转换为整数.有可能吗?

I have a string, for example "01001011" and what I need to do is to reverse it, so I used .split('') than .reverse() and now I need to read the array as a string and convert it to integer. Is it possible?

谢谢

推荐答案

如果要将数组转换回字符串，请使用join()(

If you want to convert the array back to a string use join() (MDN) and for converting a string to an integer use parseInt() (MDN). The second argument of the later is an optional radix.

JavaScript将尝试确定要使用的基数，但是要确保始终应手动添加基数.从MDN引用:

JavaScript will try to determine, what radix to use, but to be sure you should always add your radix manually. Citing from MDN:

如果未定义基数或为0，则JavaScript假定以下条件:

If radix is undefined or 0, JavaScript assumes the following:

• 如果输入字符串以"0x"或"0X"开头，则基数为16(十六进制).

• If the input string begins with "0x" or "0X", radix is 16 (hexadecimal).

如果输入字符串以"0"开头，则基数为八(八进制).此功能是非标准的，某些实现故意不支持此功能(而是使用基数10).因此，在使用parseInt时始终指定一个基数.

If the input string begins with "0", radix is eight (octal). This feature is non-standard, and some implementations deliberately do not support it (instead using the radix 10). For this reason always specify a radix when using parseInt.

如果输入字符串以任何其他值开头，则基数为10(十进制).

If the input string begins with any other value, the radix is 10 (decimal).

因此，在您的情况下，以下代码应该起作用:

So in your case the following code should work:

var a = '01001011';

var b = parseInt( a.split('').reverse().join(''), 2 );

或仅(如果您想转换起始字符串而不进行逆转):

or just (if you would want to convert the starting string, without the reversal):

var b = parseInt( a, 2 );

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