javascript - 在对象中查找键值

Question

我有以下对象(Json):

 let object = {
"statusCode": 200,
"body": [{
        "id": "3",
        "externalId": "yehudakala4",
        "status": "active",
        "createdAt": "2018-11-14T08:36:50.967Z",
        "updatedAt": "2018-11-14T08:36:50.967Z",
        "firstName": "yehu",
        "lastName": "da",
        "email": "ye@g.com"
    }
],
"headers": {
    "x-powered-by": "Express",
    "access-control-allow-origin": "*",
    "content-type": "application/json; charset=utf-8",
    "content-length": "189",
    "etag": "W/\"bd-Emx3/KChQLzf9+6bgFSHXPQgDTM\"",
    "date": "<<Masked>>",
    "connection": "close"
},
"request": {
    "uri": {
        "protocol": "http:",
        "slashes": true,
        "auth": null,
        "host": "user-management-service.dev.local:4202",
        "port": "4202",
        "hostname": "user-management-service.dev.local",
        "hash": null,
        "search": "?username=yehudakala4",
        "query": "username=yehudakala4",
        "pathname": "/v1/users",
        "path": "/v1/users?username=yehudakala4",
        "href": "http://user-management-service.dev.local:4202/v1/users?username=yehudakala4"
    },
    "method": "GET",
    "headers": {
        "Content-Type": "application/json",
        "accept": "application/json",
        "content-length": 2
    }
}

给定以下函数:

let key = "protocol";
let value = "http:";
let x;
let res = false;
let findValue = function findValue(obj, key, value) {

for(let localKey in obj){
    if(obj.hasOwnProperty(localKey)){
        //console.log(localKey)
        if(localKey === key){
            res = obj[localKey] === value;
            return res;
        }
        else
        {
            let val = obj[localKey];
            if(typeof val === 'object')
                x = findValue(val, key, value);
                if (typeof x === 'boolean') {
                    return x;
                }         
            }
        }
    }
}

let rs = findValue(object, key, value)
console.log(rs);

这种方法有两个问题:

1. 如果key在对象中不存在，则函数返回undefine
2. 如果key出现多次，只检查第一次

我的目标是检查任何出现的键，如果其中一个键的值不匹配返回 false，如果所有匹配返回 true。

其次，如果key不存在则返回false。

Answer 1

我更改了您的函数，通过将 Set 作为递归中的上下文来获取给定键的所有值。

然后您检查集合是否有一个等于您的值的值。

查看更新的代码段。

最后，作为旁注，Object.keys 将使您的代码更精简，因为您不必检查 hasOwnProperty。

let findValues = function(obj, key, found) {
  for (let localKey in obj) {
    if (obj.hasOwnProperty(localKey)) {
      let val = obj[localKey];
      //console.log(localKey)
      if (localKey === key) {
        found.add(val)
      } else {
        if (typeof val === 'object') {
          findValues(val, key, found)
        }
      }
    }
  }
}

function uniqueValue(obj, key, value) {
  let found = new Set()
  findValues(object, key, found)
  return found.size === 1 && found.has(value);
}

let object = {
  "statusCode": 200,
  "body": [{
    "id": "3",
    "externalId": "yehudakala4",
    "status": "active",
    "createdAt": "2018-11-14T08:36:50.967Z",
    "updatedAt": "2018-11-14T08:36:50.967Z",
    "firstName": "yehu",
    "lastName": "da",
    "email": "ye@g.com"
  }],
  "headers": {
    "x-powered-by": "Express",
    "access-control-allow-origin": "*",
    "content-type": "application/json; charset=utf-8",
    "content-length": "189",
    "etag": "W/\"bd-Emx3/KChQLzf9+6bgFSHXPQgDTM\"",
    "date": "<<Masked>>",
    "connection": "close"
  },
  "request": {
    "uri": {
      "protocol": "http:",
      "slashes": true,
      "auth": null,
      "host": "user-management-service.dev.local:4202",
      "port": "4202",
      "hostname": "user-management-service.dev.local",
      "hash": null,
      "search": "?username=yehudakala4",
      "query": "username=yehudakala4",
      "pathname": "/v1/users",
      "path": "/v1/users?username=yehudakala4",
      "href": "http://user-management-service.dev.local:4202/v1/users?username=yehudakala4"
    },
    "method": "GET",
    "headers": {
      "Content-Type": "application/json",
      "accept": "application/json",
      "content-length": 2
    }
  }
}

let key = "protocol";
let value = "http:";

console.log(uniqueValue(object, key, value));