从嵌套字典中删除NAs (javascript)

function removeNAs(obj) {
  for (var key in obj) {
    if (obj.hasOwnProperty(key)) {
      if (obj[key] === null || obj[key] === undefined) {
        delete obj[key];
      } else if (typeof obj[key] === 'object') {
        removeNAs(obj[key]);
      }
    }
  }
  return obj;
}

// 示例用法
var nestedDict = {
  key1: 'value1',
  key2: null,
  key3: {
    nestedKey1: 'nestedValue1',
    nestedKey2: null,
    nestedKey3: {
      deeplyNestedKey1: 'deeplyNestedValue1',
      deeplyNestedKey2: undefined
    }
  }
};

var result = removeNAs(nestedDict);
console.log(result);