JavaScript:如何展平像这样的对象

function flattenObject(obj) {
  let result = {};
  
  function recurse(currentObj, currentKey) {
    for (let key in currentObj) {
      let value = currentObj[key];
      let newKey = currentKey ? currentKey + '.' + key : key;
      
      if (typeof value === 'object' && value !== null) {
        recurse(value, newKey);
      } else {
        result[newKey] = value;
      }
    }
  }
  
  recurse(obj, '');
  
  return result;
}

let obj = {
  a: 1,
  b: {
    c: 2,
    d: {
      e: 3
    }
  }
};

let flattenedObj = flattenObject(obj);
console.log(flattenedObj);

{
  "a": 1,
  "b.c": 2,
  "b.d.e": 3
}

function flattenObject(obj) {
  let result = {};
  let stack = [{ obj: obj, prefix: '' }];
  
  while (stack.length > 0) {
    let { obj, prefix } = stack.pop();
    
    for (let key in obj) {
      let value = obj[key];
      let newKey = prefix ? prefix + '.' + key : key;
      
      if (typeof value === 'object' && value !== null) {
        stack.push({ obj: value, prefix: newKey });
      } else {
        result[newKey] = value;
      }
    }
  }
  
  return result;
}

let obj = {
  a: 1,
  b: {
    c: 2,
    d: {
      e: 3
    }
  }
};

let flattenedObj = flattenObject(obj);
console.log(flattenedObj);

{
  "a": 1,
  "b.c": 2,
  "b.d.e": 3
}