转换为不带括号的字符串

function removeParentheses(str) {
  let result = '';
  let stack = [];

  for (let i = 0; i < str.length; i++) {
    if (str[i] === '(') {
      stack.push(i);
    } else if (str[i] === ')') {
      if (stack.length > 0) {
        let start = stack.pop();
        let content = str.slice(start + 1, i);
        result += content;
      }
    }
  }

  return result;
}

let input = '(转换为)不带括号的(字符串)';
let output = removeParentheses(input);
console.log(output); // 输出：转换为不带括号的字符串