js实现字符串压缩与解压算法

字符串压缩：

function compress(str) {
  let count = 1;
  let result = "";
  for (let i = 0; i < str.length; i++) {
    if (str[i] === str[i + 1]) {
      count++;
    } else {
      result += str[i] + count;
      count = 1;
    }
  }
  return result;
}

字符串解压：

function decompress(str) {
  let result = "";
  for (let i = 0; i < str.length; i += 2) {
    result += str[i].repeat(str[i + 1]);
  }
  return result;
}

例如：

const str = "aabcccccaa";
const compressedStr = compress(str);
console.log(compressedStr); // "a2b1c5a2"
console.log(decompress(compressedStr)); // "aabcccccaa"
``