递归获取对象属性 #

const user = {
  info: {
    name: "张三",
    address: { home: "Shaanxi", company: "Xian" },
  },
};

// obj是获取属性的对象，path是路径，fallback是默认值
function get(obj, path, fallback) {
  const parts = path.split(".");
  const key = parts.shift();
  if (typeof obj[key] !== "undefined") {
    return parts.length > 0 ?
      get(obj[key], parts.join("."), fallback) :
      obj[key];
  }
  // 如果没有找到key返回fallback
  return fallback;
}

console.log(get(user, "info.name")); // 张三
console.log(get(user, "info.address.home")); // Shaanxi
console.log(get(user, "info.address.company")); // Xian
console.log(get(user, "info.address.abc", "fallback")); // fallback