Javascript JSON透视图

假设我有一个JSON文档/JavaScript对象，如下所示：

var animal = {
  "squirrel": "Squirrels belong to a large family of small or medium-sized rodents called the Sciuridae."
}

在JavaScript中，这种情况会发生：

console.log(animal.squirrel) //Squirrels belong to a large family of small or medium-sized rodents called the Sciuridae

假设我想将

rank

对象添加到：

var animal = {
  "squirrel": {   
    "rank": {
      "Kingdom": "Animalia",
      "Phylum": "Chordata",
      "Class": "Mammalia",
      "Order": "Rodentia",
      "Suborder": "Sciuromorpha",
      "Family": "Sciuridae"
    }
  }
}

该等级可以访问，如下所示：

animal.squirrel.rank

但是我仍然希望

animal.squirrel

对象的顶层是包含上述句子的字符串

---

这可能吗？

这在JSON中是不可能的。然而，在JavaScript中，您可以做一些事情。您可以提供将对象转换为字符串时要使用的

toString

方法：

var animal = {
  "squirrel": {   
    "rank": {
      "Kingdom": "Animalia",
      "Phylum": "Chordata",
      "Class": "Mammalia",
      "Order": "Rodentia",
      "Suborder": "Sciuromorpha",
      "Family": "Sciuridae"
    },
    toString: function() {
      return "Squirrels belong to a large family of small or medium-sized rodents called the Sciuridae.";
    }
  }
};

您还可以使用

字符串
对象：

var animal = {
    squirrel: new String("Squirrels belong to a large family of small or medium-sized rodents called the Sciuridae.")
};

animal.squirrel.rank = {
    "Kingdom": "Animalia",
    "Phylum": "Chordata",
    "Class": "Mammalia",
    "Order": "Rodentia",
    "Suborder": "Sciuromorpha",
    "Family": "Sciuridae"
};

后者的行为更像一个字符串，但它使用一个
string
对象，这有时会让人沮丧，而且通常是不好的做法。
正如其他人所说，这在任何对象上下文中都是不可能的，因此您需要将所有内容作为对象上/中的可访问部分来处理

var animal = {
  "squirrel": {
    "info": "Squirrels belong to a large family of small or medium-sized rodents called the Sciuridae.",
    "rank": {
      ...
    }
  }
}

而且，我想，您可以为共性设置快速访问器

function getAnimalInfo(animalName) {
  if (!animal[animalName]) return "No info for: " + animalName;

  return animal[animalName].info;
}

所以

哦，你比我快一分钟@你可以在这里看到：我喜欢这个。有些东西是干净的。还是希望我能用动物。松鼠。
console.log(getAnimalInfo("squirrel")); //Squirrels belong to a large family of small or medium-sized rodents called the Sciuridae