基本上我测试ES6,并希望尝试和返回的对象数组中的对象的对象,数组中的每个对象有一个ID和父母,ID将是在父母的财产。够简单了,这里是我的代码:问题与对象的对象
//an array of objects
let animals = [{
id: "animal",
parent: null
}, {
id: "dog",
parent: "animal"
}, {
id: "cat",
parent: "animal"
}, {
id: "fish",
parent: "animal"
}, {
id: "labrador",
parent: "dog"
}, {
id: "cocker spaniel",
parent: "dog"
}, {
id: "bass",
parent: "fish"
}, {
id: "tuna",
parent: "fish"
}, {
id: "house cat",
parent: "cat"
}, {
id: "outdoor cat",
parent: "cat"
}, {
id: "human",
parent: "animal"
}, {
id: "man",
parent: "human"
}, {
id: "woman",
parent: "human"
}];
//a recursive function to build our object of objects tree
let makeTreeOfCategories = (categories, parent) => {
let parentNode = {};
categories
.filter(category => category.parent === parent)
.forEach(category => parentNode[category.id] =
makeTreeOfCategories(categories, category.id));
return parentNode;
};
console.log(JSON.stringify(makeTreeOfTrees(animals, null), null, 2));
该代码将返回:
{
"animal": {
"dog": {
"labrador": {},
"cocker spaniel": {}
},
"cat": {
"house cat": {},
"outdoor cat": {}
},
"fish": {
"bass": {},
"tuna": {}
},
"human": {
"man": {},
"woman": {}
}
}
}
现在,如果我们运行以下命令:
//call our object and store in a variable
let obj = makeTreeOfCategories(animals, null);
//loop through the object and alert each child item and its children
for (var key in obj) {
var val = obj[key];
alert("Key: " + key + " value:" + val);
}
它会提醒一次说“重点:动物价值:[对象对象]“,但我不明白的是为什么,我期望它会以”关键:动物价值:狗“,然后”关键:动物价值:猫“等等来回报。
你知道,基本上让我遍历对象的对象内的每个对象,并提醒其属性和它们的值。
而且,如果你能告诉我这也是,我将如何访问是这样的:
{}.animal.dog.labrador
如果我一直在寻找一些具体的事情一样,如果拉布拉多有个名字叫例如财产。
我希望是有道理的,我想我只是混淆自己如果有什么刚才,但我希望我清楚我曾尝试和我想的事情发生。
干杯, SD
可能重复( http://stackoverflow.com/q/5612787/1048572)或[为什么'[object object]'提到“对象”两次?](http://stackoverflow.com/q/29847665/1048572) – Bergi