javascript将十六进制值的字符串表示形式转换为十六进制

Question

In Javascript, how do I convert a string representation of a hex value into it's hex representation ?

What I have returning from a checksum routine is a string value "FE". What I need is it's hex representation "\\xFE"

I cannot simply do this, as it gives me an error:

var crc = "FE";
var hex = "\x" + crc;

This just gives me a new 4 character ASCII string:

var crc = "FE";
var hex = "0x" + "FE";

thxs for any guidance.

Answer 1

像这样

var hex = parseInt("FF", 16);

Answer 2

For the string \\xFE , escape the backslash: var hex = '\\\\x'+'FE'

To convert 'FE' to a Number use +('0xFE')

To show +('0xFE') as a hexadecimal, use (224).toString(16) , or '0x'+((254).toString(16))