循环遍历对象中的对象，然后在javascript中向另一个对象添加属性。

Question

希望能够将对象中的属性添加到单独的对象中，使其工作到一定程度，但正在返回NaN？

var votes = { "Alex": { president: "Bob", vicePresident: "Devin", secretary: "Gail", treasurer: "Kerry" },
"Bob": { president: "Mary", vicePresident: "Hermann", secretary:   "Fred", treasurer: "Ivy" },
"Cindy": { president: "Cindy", vicePresident: "Hermann", secretary: "Bob", treasurer: "Bob" },
"Devin": { president: "Louise", vicePresident: "John", secretary: "Bob", treasurer: "Fred" }, 
 "Ernest": { president: "Fred", vicePresident: "Hermann", secretary:  "Fred", treasurer: "Ivy" },
"Fred": { president: "Louise", vicePresident: "Alex", secretary: "Ivy", treasurer: "Ivy" },
"Gail": { president: "Fred", vicePresident: "Alex", secretary: "Ivy", treasurer: "Bob" },
"Hermann": { president: "Ivy", vicePresident: "Kerry", secretary: "Fred", treasurer: "Ivy" },
 "Ivy": { president: "Louise", vicePresident: "Hermann", secretary: "Fred", treasurer: "Gail" },
"John": { president: "Louise", vicePresident: "Hermann", secretary: "Fred", treasurer: "Kerry" },
"Kerry": { president: "Fred", vicePresident: "Mary", secretary: "Fred", treasurer: "Ivy" },
"Louise": { president: "Nate", vicePresident: "Alex", secretary: "Mary", treasurer: "Ivy" },
"Mary": { president: "Louise", vicePresident: "Oscar", secretary: "Nate", treasurer: "Ivy" },
"Nate": { president: "Oscar", vicePresident: "Hermann", secretary: "Fred", treasurer: "Tracy" },
"Oscar": { president: "Paulina", vicePresident: "Nate", secretary: "Fred", treasurer: "Ivy" },
"Paulina": { president: "Louise", vicePresident: "Bob", secretary: "Devin", treasurer: "Ivy" },
"Quintin": { president: "Fred", vicePresident: "Hermann", secretary: "Fred", treasurer: "Bob" },
"Romanda": { president: "Louise", vicePresident: "Steve", secretary: "Fred", treasurer: "Ivy" },
"Steve": { president: "Tracy", vicePresident: "Kerry", secretary: "Oscar", treasurer: "Xavier" },
"Tracy": { president: "Louise", vicePresident: "Hermann", secretary: "Fred", treasurer: "Ivy" },
"Ullyses": { president: "Louise", vicePresident: "Hermann", secretary: "Ivy", treasurer: "Bob" },
"Valorie": { president: "Wesley", vicePresident: "Bob", secretary: "Alex", treasurer: "Ivy" },
"Wesley": { president: "Bob", vicePresident: "Yvonne", secretary: "Valorie", treasurer: "Ivy" },
"Xavier": { president: "Steve", vicePresident: "Hermann", secretary: "Fred", treasurer: "Ivy" },
"Yvonne": { president: "Bob", vicePresident: "Zane", secretary: "Fred", treasurer: "Hermann" },
"Zane": { president: "Louise", vicePresident: "Hermann", secretary: "Fred", treasurer: "Mary" }
};

// Tally the votes in voteCount.
var voteCount = {
   president: {},
   vicePresident: {},
   secretary: {},
   treasurer: {}
};

for (var student in votes) {
  if (votes.hasOwnProperty(student)) {
    var office = votes[student];
    for (var prop in office) {
      if (!office.hasOwnProperty("president")) {
        voteCount["president"][office["president"]] = 0;
      } else {
        voteCount["president"][office["president"]] += 1;
      }
    }
  }
}

以上为循环返回NaN！

我正在向voteCount传递信息，但没有得到多少选票？？

voteCount变成

voteCount
{ president: 
  { Bob: NaN,
    Mary: NaN,
    Cindy: NaN,
    Louise: NaN,
    Fred: NaN,

Answer 1

我认为您的错误是在结果对象中添加属性。

这是一种不同的方法，它根据角色动态地构建结果对象。

var results = {};

var n,r,v;

for (n in votes) {
    for (r in votes[n]) {
        if (typeof results[r] === "undefined") {
             results[r] = {};
        }
        if (typeof results[r][votes[n][r]] === "undefined") {
             results[r][votes[n][r]] = 0;
        }
        results[r][votes[n][r]]+=1;
    }
}
console.log(results);

另外，最好将所有的var放在代码的开头，将它们放在fors中并不限制它们的范围，它们是在解析时声明的，并且是全局的。

Answer 2

稍微修正了您的代码，希望我没有破坏逻辑：

for (var student in votes) {
  if (votes.hasOwnProperty(student)) {
    var office = votes[student];
    for (var prop in office) {
      // init property with 0
      if (!voteCount[prop][office[prop]]) {
        voteCount[prop][office[prop]] = 0;
      }

      // add vote
      voteCount[prop][office[prop]]++;
    }
  }
}

小提琴是这里。

UPD:让它适用于所有的办公室。

Answer 3

您可以通过更改检查总统办公室hasOwnProperty的行来解决这一问题：

 if (!office.hasOwnProperty("president")) {

对此：

 if (!voteCount["president"].hasOwnProperty(office["president"])) {

最终结果是：

        var votes = { "Alex": { president: "Bob", vicePresident: "Devin", secretary: "Gail", treasurer: "Kerry" },
        "Bob": { president: "Mary", vicePresident: "Hermann", secretary:   "Fred", treasurer: "Ivy" },
        "Cindy": { president: "Cindy", vicePresident: "Hermann", secretary: "Bob", treasurer: "Bob" },
        "Devin": { president: "Louise", vicePresident: "John", secretary: "Bob", treasurer: "Fred" },
        "Ernest": { president: "Fred", vicePresident: "Hermann", secretary:  "Fred", treasurer: "Ivy" },
        "Fred": { president: "Louise", vicePresident: "Alex", secretary: "Ivy", treasurer: "Ivy" },
        "Gail": { president: "Fred", vicePresident: "Alex", secretary: "Ivy", treasurer: "Bob" },
        "Hermann": { president: "Ivy", vicePresident: "Kerry", secretary: "Fred", treasurer: "Ivy" },
        "Ivy": { president: "Louise", vicePresident: "Hermann", secretary: "Fred", treasurer: "Gail" },
        "John": { president: "Louise", vicePresident: "Hermann", secretary: "Fred", treasurer: "Kerry" },
        "Kerry": { president: "Fred", vicePresident: "Mary", secretary: "Fred", treasurer: "Ivy" },
        "Louise": { president: "Nate", vicePresident: "Alex", secretary: "Mary", treasurer: "Ivy" },
        "Mary": { president: "Louise", vicePresident: "Oscar", secretary: "Nate", treasurer: "Ivy" },
        "Nate": { president: "Oscar", vicePresident: "Hermann", secretary: "Fred", treasurer: "Tracy" },
        "Oscar": { president: "Paulina", vicePresident: "Nate", secretary: "Fred", treasurer: "Ivy" },
        "Paulina": { president: "Louise", vicePresident: "Bob", secretary: "Devin", treasurer: "Ivy" },
        "Quintin": { president: "Fred", vicePresident: "Hermann", secretary: "Fred", treasurer: "Bob" },
        "Romanda": { president: "Louise", vicePresident: "Steve", secretary: "Fred", treasurer: "Ivy" },
        "Steve": { president: "Tracy", vicePresident: "Kerry", secretary: "Oscar", treasurer: "Xavier" },
        "Tracy": { president: "Louise", vicePresident: "Hermann", secretary: "Fred", treasurer: "Ivy" },
        "Ullyses": { president: "Louise", vicePresident: "Hermann", secretary: "Ivy", treasurer: "Bob" },
        "Valorie": { president: "Wesley", vicePresident: "Bob", secretary: "Alex", treasurer: "Ivy" },
        "Wesley": { president: "Bob", vicePresident: "Yvonne", secretary: "Valorie", treasurer: "Ivy" },
        "Xavier": { president: "Steve", vicePresident: "Hermann", secretary: "Fred", treasurer: "Ivy" },
        "Yvonne": { president: "Bob", vicePresident: "Zane", secretary: "Fred", treasurer: "Hermann" },
        "Zane": { president: "Louise", vicePresident: "Hermann", secretary: "Fred", treasurer: "Mary" }
    };

    // Tally the votes in voteCount.
    var voteCount = {
        president: {},
        vicePresident: {},
        secretary: {},
        treasurer: {}
    };

    for (var student in votes) {
        if (votes.hasOwnProperty(student)) {
            var office = votes[student];
            for (var prop in office) {
                if (!voteCount["president"].hasOwnProperty(office["president"])) {
                    voteCount["president"][office["president"]] = 0;
                } else {
                    voteCount["president"][office["president"]] += 1;
                }
            }
        }
    }