js 去除json数据中的空值

function removeEmptyValues(obj) {
  for (let key in obj) {
    if (obj.hasOwnProperty(key)) {
      if (obj[key] === null || obj[key] === undefined || obj[key] === '') {
        delete obj[key];
      } else if (Array.isArray(obj[key])) {
        obj[key] = obj[key].filter(item => item !== null && item !== undefined && item !== '');
        if (obj[key].length === 0) {
          delete obj[key];
        }
      } else if (typeof obj[key] === 'object') {
        removeEmptyValues(obj[key]);
        if (Object.keys(obj[key]).length === 0) {
          delete obj[key];
        }
      }
    }
  }
  return obj;
}

// 示例JSON数据
let jsonData = {
  name: "John",
  age: null,
  address: {
    street: "",
    city: "New York",
    zip: null
  },
  hobbies: ["reading", "", "traveling"],
  contact: {
    email: "john@example.com",
    phone: undefined
  }
};

// 去除空值后的JSON数据
let cleanedData = removeEmptyValues(jsonData);
console.log(cleanedData);