javascript-通过其值查找嵌套的对象键 [英] javascript - find nested object key by its value

问题描述

我正在尝试查找包含我的值的对象的键.

I'm trying to find key of object which is containing my value.

有我的对象:

var obj = {}

obj["post1"] = {
    "title":    "title1",
    "subtitle": "subtitle1"
}

obj["post2"] = {
    "title":    "title2",
    "subtitle": "subtitle2"
}

现在，我正在尝试获取值"title2"的对象键

And now, I'm trying to get object key of value "title2"

function obk (obj, val) {
  const key = Object.keys(obj).find(key => obj[key] === val);
  return key
}

console.log(obk(obj, "title2"))

输出:

undefined

所需的输出:

post2

推荐答案

您必须访问对象的子项:

You have to access the subkey of the object:

 function obk (obj, prop, val) {
   return Object.keys(obj).find(key => obj[key][prop] === val);
 }

 console.log(obk(obj, "title", "title2"));

或者您可以搜索子对象的所有值:

Or you could search all values of the subobject:

 function obk (obj, val) {
   return Object.keys(obj).find(key => Object.values( obj[key] ).includes(val)); 
 }

 console.log(obk(obj, "title2"))

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