没有花花肠子,直接暴力

借鉴题解区大佬的,写的js版本

function trans(str,b){
  let decode="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789".split('');
  let encode="BCDEFGHIJKLMNOPQRSTUVWXYZAbcdefghijklmnopqrstuvwxyza1234567890".split('');
  let res='';
  if(b){
    //加密
    res=str.split('').map(char=>encode[decode.indexOf(char)]).join('');
  }else{
    res=str.split('').map(char=>decode[encode.indexOf(char)]).join('');
  }
  return res;
}
let str1=readline();
let str2=readline();
console.log(trans(str1,true));
console.log(trans(str2,false));