是否有一个 Unicode 字符的作用类似于退格键或者是不可见的？

Question

我弄乱了一系列随机的Unicode字符。我生成了两个不同长度相同的不同字符串。它们都在0到255之间的随机Unicode字符填充。我注意到程序后一个字符串的长度与另一个字符串的长度不同。剂量有人知道在Unicode中是否有一个看不见的角色或角色删除该字符？

//coded in javascript but the native language is Java
function generate(text) {
  //create an decode key array
  let decodeKey = [];
  for (let i = 0; i < text.length * 2; i++) {
    decodeKey.push(Math.floor(Math.random() * 10));
  }
  let binary = [];
  for (let i = 0; i < text.length; i++) {
    //turn text to binary and split at every 4th character
    let b = text.charCodeAt(i).toString(2);
    while (b.length < 8) {
      b = "0" + b;
    }
    binary.push(b.slice(0, 4));
    binary.push(b.slice(3));
  }
  //convert binary to a number and multiply by the decode key
  let nums = [];
  for (let i = 0; i < binary.length; i++) {
    nums.push(parseInt(binary[i].toString(10)) * decodeKey[i]);
  }
  //convert nums to unicode
  let uniChars = [];
  for (let i = 0; i < nums.length; i++) {
    uniChars.push(String.fromCharCode(parseInt(nums[i])));
  }
  //create final string with decode key at the bottom
  let result = "";
  for (let i = 0; i < uniChars.length; i++) {
    result += uniChars[i];
  }
  result += "\n"
  for (let i = 0; i < decodeKey.length; i++) {
    result += String.fromCharCode(decodeKey[i]);
  }
  //return the result
  return result;
}

console.log(generate("Test / Sample Text, Test / Sample Text, Test / Sample Text, Test / Sample Text"));