Javascript：十六进制至十进制的字符串

Question

I've got this string containing multiple hexadecimal numbers:

let input = '\\x01\\x01\\x02\\x01';

I would like to see this transformed into: 1121 (the decimal representation of each hex number)

How would I go about this? I've tried numerous things, but the only output I get are some diamond shapes with a questionmark inside of it or syntax errors. Many thanks in advance!

Answer 1

Here is a simple method that escapes the string, removes empty elements, converts each number to is decimal digit, joins it as a string, and then converts the final result to a number.

 function convert(string) { string = escape(string); string = string.split(/%/).filter(e=>e); string = string.map(e => +("0x"+e)); return +string.join(""); } // Test case var decimal = convert('\\x01\\x01\\x02\\x01'); console.log(decimal); 

Answer 2

To be able to work with the escape sequences itself and not the resulting whitespace, you habe to use String raw then you can replace:

let input = String.raw`\x01\x01\x02\x01`;

console.log(
  input
   .replace(/\\x01/g, "1")
   .replace(/\\x02/g, "2")
);