JS:如何提取object的嵌套字符串？

function extractStrings(obj) {
  let result = [];
  
  for (let key in obj) {
    if (typeof obj[key] === 'string') {
      result.push(obj[key]);
    } else if (typeof obj[key] === 'object') {
      result = result.concat(extractStrings(obj[key]));
    }
  }
  
  return result;
}

// 示例对象
const obj = {
  name: 'John',
  age: 30,
  address: {
    street: '123 Main St',
    city: 'New York',
    country: 'USA'
  },
  hobbies: ['reading', 'painting']
};

// 提取嵌套字符串
const strings = extractStrings(obj);
console.log(strings);

function extractStrings(obj) {
  let result = [];
  let stack = [obj];
  
  while (stack.length > 0) {
    let currentObj = stack.pop();
    
    for (let key in currentObj) {
      if (typeof currentObj[key] === 'string') {
        result.push(currentObj[key]);
      } else if (typeof currentObj[key] === 'object') {
        stack.push(currentObj[key]);
      }
    }
  }
  
  return result;
}

// 示例对象
const obj = {
  name: 'John',
  age: 30,
  address: {
    street: '123 Main St',
    city: 'New York',
    country: 'USA'
  },
  hobbies: ['reading', 'painting']
};

// 提取嵌套字符串
const strings = extractStrings(obj);
console.log(strings);