Conversion between multiple bases

What is the base

1. Base is the carry counting system , Artificially defined calculation method with carry
2. For any system ---X Base number , It means that the number operation on each bit is every X Into one ( Add and subtract in the same base )

notes ： There are counting methods without carry , For example, the original twine counting method , Commonly used in singing “ just ” Word count , And similar tally mark Count
Basic concepts

name	describe	describe	Regular expressions
Binary system	0~1 To represent the number of	Two states of on-off ( Binary is used in computer field for technical reasons )	/^[0,1]*$/
Quaternary	0~3 To represent the number of	Quaternary is people's description of the objective existence of climate change around the earth , Turn the revolution into four areas , It is four o'clock ( spring, summer, autumn and winter ), Expand the chaotic binary world into a quaternary world ( For heredity 、 The data transfer 、 Base conversion, etc )	/^[0-3]*$/
octal	0~7 To represent the number of	electronic technique 、 Computer programming and other fields are used together with binary	/^[0-7]*$/
Decimal system	0~9 To represent the number of	As a counting method	/^[0-9]*$/
Hexadecimal	0~15 To represent the number of	electronic technique 、 Computer programming and other fields are used together with binary . 0~9、10=>A、11=>B、12=>C、13=>D、14=>E、15=>F	/^[0-9A-f]*$/
32 base	0~31 To represent the number of	0~9、10=>A、11=>B、12=>C、13=>D、14=>E、15=>F、16=>G、17=>H、18=>I、19=>J、20=>K、21=>L、22=>M、23=>N、24=>O、25=>P、26=>Q、27=>R、28=>S、29=>T、30=>U、31=>V	/^[0-9A-u]*$/

Method

function regular(param1, param2, param3) {
  let arr = [2, 4, 8, 10, 16, 32];
  param3 = param3 ? param3 : 10;
  let obg = [/^[0,1]*$/, /^[0-3]*$/, /^[0-7]*$/, /^[0-9]*$/, /^[0-9A-f]*$/, /^[0-9A-u]*$/]
  let reg = obg[`${arr?.indexOf(param3)}`];
  let nub = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V'];
  if (reg.test(param1)) {
    let param = param1.toString().split('');
    let num = param.reduce((vauel, item, index) => (vauel += nub.indexOf(item) * (param3 ** ((param.length - index) - 1))), 0);
    const turn = (num1, num2) => {
      let num = Math.floor(num1 / num2);
      let value = num1 - num2 * num;
      return `${num ? turn(num, num2) : ''}${nub[value]}`;
    }
    return turn(num, param2);
  } else {
    return ` Choose the right one ${param3} Binary operation `;
  }
}