使用javascript或jquery计算对象中JSON对象的数量

我有一个来自AJAX响应的JSON数据，如下所示

    {
        "2015001":{"sname":"name1","01-07-2015":null,"02-07-2015":"0","03-07-2015":"0","04-07-2015":"0","05-07-2015":null,"06-07-2015":"0","07-07-2015":"0","08-07-2015":"0","09-07-2015":"0","10-07-2015":"0","11-07-2015":null,"12-07-2015":null,"13-07-2015":"0","14-07-2015":"1","15-07-2015":null,"16-07-2015":"2","17-07-2015":null,"18-07-2015":null,"19-07-2015":null,"20-07-2015":"2","21-07-2015":"0","22-07-2015":"0","23-07-2015":"0","24-07-2015":"1","25-07-2015":"1","26-07-2015":null,"27-07-2015":"2","28-07-2015":null,"29-07-2015":"2","30-07-2015":"2","31-07-2015":"2"},
        "2015002":{"sname":"name2","01-07-2015":null,"02-07-2015":"0","03-07-2015":"1","04-07-2015":"1","05-07-2015":null,"06-07-2015":"0","07-07-2015":"0","08-07-2015":"0","09-07-2015":"0","10-07-2015":"2","11-07-2015":null,"12-07-2015":null,"13-07-2015":"1","14-07-2015":"1","15-07-2015":null,"16-07-2015":"2","17-07-2015":null,"18-07-2015":null,"19-07-2015":null,"20-07-2015":"0","21-07-2015":"0","22-07-2015":"0","23-07-2015":"0","24-07-2015":"0","25-07-2015":"0","26-07-2015":null,"27-07-2015":"0","28-07-2015":null,"29-07-2015":"0","30-07-2015":"0","31-07-2015":"0"},
        "2015003":{"sname":"name3","01-07-2015":null,"02-07-2015":"2","03-07-2015":"2","04-07-2015":"2","05-07-2015":null,"06-07-2015":"2","07-07-2015":"2","08-07-2015":"0","09-07-2015":"2","10-07-2015":"2","11-07-2015":null,"12-07-2015":null,"13-07-2015":"2","14-07-2015":"0","15-07-2015":null,"16-07-2015":"2","17-07-2015":null,"18-07-2015":null,"19-07-2015":null,"20-07-2015":"2","21-07-2015":"2","22-07-2015":"0","23-07-2015":"2","24-07-2015":"2","25-07-2015":"2","26-07-2015":null,"27-07-2015":"2","28-07-2015":null,"29-07-2015":"2","30-07-2015":"2","31-07-2015":"2"},
        "2015004":{"sname":"name4","01-07-2015":null,"02-07-2015":"2","03-07-2015":"2","04-07-2015":"2","05-07-2015":null,"06-07-2015":"0","07-07-2015":"2","08-07-2015":"2","09-07-2015":"2","10-07-2015":"2","11-07-2015":null,"12-07-2015":null,"13-07-2015":"2","14-07-2015":"2","15-07-2015":null,"16-07-2015":"2","17-07-2015":null,"18-07-2015":null,"19-07-2015":null,"20-07-2015":"0","21-07-2015":"2","22-07-2015":"2","23-07-2015":"2","24-07-2015":"2","25-07-2015":"0","26-07-2015":null,"27-07-2015":"2","28-07-2015":null,"29-07-2015":"0","30-07-2015":"2","31-07-2015":"2"},
        "2015005":{"sname":"name5","01-07-2015":null,"02-07-2015":"2","03-07-2015":"2","04-07-2015":"0","05-07-2015":null,"06-07-2015":"2","07-07-2015":"2","08-07-2015":"2","09-07-2015":"2","10-07-2015":"2","11-07-2015":null,"12-07-2015":null,"13-07-2015":"2","14-07-2015":"2","15-07-2015":null,"16-07-2015":"2","17-07-2015":null,"18-07-2015":null,"19-07-2015":null,"20-07-2015":"0","21-07-2015":"2","22-07-2015":"2","23-07-2015":"2","24-07-2015":"2","25-07-2015":"2","26-07-2015":null,"27-07-2015":"2","28-07-2015":null,"29-07-2015":"2","30-07-2015":"2","31-07-2015":"2"},
        "2015006":{"sname":"name6","01-07-2015":null,"02-07-2015":"2","03-07-2015":"2","04-07-2015":"2","05-07-2015":null,"06-07-2015":"2","07-07-2015":"2","08-07-2015":"2","09-07-2015":"2","10-07-2015":"2","11-07-2015":null,"12-07-2015":null,"13-07-2015":"2","14-07-2015":"2","15-07-2015":null,"16-07-2015":"2","17-07-2015":null,"18-07-2015":null,"19-07-2015":null,"20-07-2015":"2","21-07-2015":"0","22-07-2015":"2","23-07-2015":"2","24-07-2015":"2","25-07-2015":"2","26-07-2015":null,"27-07-2015":"2","28-07-2015":null,"29-07-2015":"2","30-07-2015":"2","31-07-2015":"2"}
    }

每个对象具有相同数量的对象。这里我想计算第一个对象（2015001）中的对象数。每次请求时，钥匙都会更换

我试过了

console.log(Object.keys(data[2015001]).length)

我得到了我需要的

---

但是如果您总是想知道第一个对象的键数，那么应该使用

object.keys（data[object.keys（data）[0]]）。length

---

请注意，如果顺序对您很重要，您应该在数组中而不是在对象中发送键，因为根据规范，对象是无序的名称/值对集。

如果您总是想知道第一个对象的键数，那么您应该使用

object.keys（data[object.keys（data）[0]].长度

请注意，如果顺序对您很重要，您应该在数组中而不是在对象中发送键，因为根据规范，对象是一组无序的名称/值对。

您可以获取并使用它访问对象，这可能是最快的方式，但您的信息还是有点不清楚，你说的是物体和更多的物体，但我不确定你说的是外部物体还是内部物体

for (var k in Object) {
    break
}
console.log(Object.keys(data[k]).length)

您可以获取并使用它访问对象，这可能是最快的方式，但您的信息有点不清楚，您正在谈论对象和更多对象，但我不确定您何时谈论外部对象或内部对象

for (var k in Object) {
    break
}
console.log(Object.keys(data[k]).length)

---

不要强制使用数组，只有当你有一个没有键的列表时才使用数组，如果你有键，就使用对象。您将数组与哈希表混淆，但在js中，哈希表是对象anyway@DarkMukke这里的问题是，他似乎总是想检查列表中的第一个日期，我猜他是在假设它的顺序与他输入/发送给客户的顺序相同。因为对象是无序的，所以在上面的示例中，他期望的顺序可能会改变，除非使用数组（数组总是保持顺序）。把这看作是我所指的可能令人头痛的一个例子：很公平，你的观点是正确的，但这不在OP所要求的范围之内。如果他得到的数据来自外部，那么你还没有给他最好的解决方案呢？首先我给了他解决方案，然后提醒他注意这种做法的恶龙：）哇，Thaaaaaaank你。不要强制使用数组，只有当你有一个没有键的列表时才使用数组，如果你有键，使用一个对象。您将数组与哈希表混淆，但在js中，哈希表是对象anyway@DarkMukke这里的问题是，他似乎总是想检查列表中的第一个日期，我猜他是在假设它的顺序与他输入/发送给客户的顺序相同。因为对象是无序的，所以在上面的示例中，他期望的顺序可能会改变，除非使用数组（数组总是保持顺序）。把这看作是我所指的可能令人头痛的一个例子：很公平，你的观点是正确的，但这不在OP所要求的范围之内。如果他得到的数据来自外部，那么你还没有给他最好的解决方案呢？首先我给了他解决方案，然后提醒他小心这种做法的恶龙：）哇，谢谢你。