您可以通过索引来访问 jsonData.seats 数组，最后一项的索引等于 jsonData.seats.length-1

简单地说：

var countryId = jsonData.seats[jsonData.seats.length-1].countryid

试试这个：

var jsonObject = {
"expirationDate":"April 21, 2017",
"remainingDays":325,
"seats":[{"activeStatus":"S","pid":"TE70","firstName":"TE70","countryid":840},
        {"activeStatus":"Y","pid":"TE80","firstName":"TE80","countryid":845}]
var lastElement = jsonObject.seats[jsonObject.seats.length-1].countryid

我使用了上面的建议，并将其用于来自GSON lib的循环JsonElement对象。以防有人在找和我一样的东西。

         for (JsonElement obj : entries){
           //Do your stuff
           if (entries.get(entries.size() - 1).equals(obj)){