对字符串简单加密解密的代码 使用Javascript

加密代码：

function encryptString(str) {
  let encrypted = "";
  for (let i = 0; i < str.length; i++) {
    let charCode = str.charCodeAt(i);
    encrypted += String.fromCharCode(charCode + 1);
  }
  return encrypted;
}

解密代码：

function decryptString(str) {
  let decrypted = "";
  for (let i = 0; i < str.length; i++) {
    let charCode = str.charCodeAt(i);
    decrypted += String.fromCharCode(charCode - 1);
  }
  return decrypted;
}

使用示例：

let originalString = "Hello World";
let encryptedString = encryptString(originalString);
let decryptedString = decryptString(encryptedString);

console.log(originalString); // "Hello World"
console.log(encryptedString); // "Ifmmp!Xpsme"
console.log(decryptedString); // "Hello World"