javascript - 如何递归查找对象键是否存在？

Question

我有以下对象

acn: "02 0002 0002"
id: "random"
name: "random"
parent_domain: "parent-random"
subDomainData: {random-l3.1: {…}}
sub_domains: ["random-l3.1"]
timestamp: 1549597441

subDomainData 是另一个可能存在或不存在的对象。如果它存在，它可以有另一个 subDomainData，它可以有一个或多个 child ，也可以没有，依此类推。

我的疑问是如何创建一个函数来递归检查它，如果为真，则将其对象推送到另一个数组；预期的最终数组将是这样的:

[
    {
      acn: "02 0002 0002"
      id: "random"
      name: "random"
      parent_domain: ""
      sub_domains: ["random-l3.1"]
      timestamp: 1549597441
    },
    { // this object would be the result of the parent subDomainData Object.
      acn: "02 0002 0002"
      id: "random-sub-1"
      name: "random-sub-1"
      parent_domain: "parent-random"
      sub_domains: ["random-l3.3"]
      timestamp: 1549597441
    }
  ]

现在我正在遵循这种方法，但事实证明这是不够的:

formatDomainList = () => {
const { domain } = this.props;
const domainList = Object.values(domain.subDomainData);
domainList.map(item => (
  Object.keys(item.subDomainData).length && (
    domainList.push(item.subDomainData)
  )
  //etc
  //etc
));
// console.log('domain list', domainList);

Answer 1

这样的东西对你有用:

//This is your original object
var someObject = {
  acn: "02 0002 0002",
  id: "random",
  name: "random",
  parent_domain: "parent-random",
  subDomainData: { someObjectWith_subDomainData },
  sub_domains: ["random-l3.1"],
  timestamp: 1549597441
 };
 //This will store the list of subDomains in this global variable.
 var subDomainList = [];

 function getSubDomainList(objectToLoop){

  if(objectToLoop.hasOwnProperty('subDomainData')){
    var numOfItems = Object.keys(objectToLoop.subDomainData).length;
    var keys = Object.keys(objectToLoop.subDomainData);
    for(var i = 0; i< numOfItems; i++){
        var key = keys[i];
        var obj = objectToLoop.subDomainData[key];
        subDomainList.push(obj);
        getSubDomainList(obj);
    }
   }
   return;
 }

 getSubDomainList(someObject);
 //The subDomainList will have the array of objects.