Javascript 获取json数组的最后一个元素
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Get the last element in json array
提问by John Wick
how can I get the last element in the json array in the seats object. I want to get the countryid of with the value of 845, however this json is dynamic so i want to get the last element in the seats object. My api is structured like this. Thank you in advance.
我怎样才能在seats 对象中获取json 数组中的最后一个元素。我想获得值为 845 的 countryid，但是这个 json 是动态的，所以我想获得座椅对象中的最后一个元素。我的 api 是这样结构的。先感谢您。
{
"expirationDate":"April 21, 2017",
"remainingDays":325,
"seats":[{"activeStatus":"S","pid":"TE70","firstName":"TE70","countryid":840},
{"activeStatus":"Y","pid":"TE80","firstName":"TE80","countryid":845}]
}
回答by Mehdi
You can do this by accessing the jsonData.seatsarray by index, index of the last item being equal to jsonData.seats.length-1
您可以通过jsonData.seats按索引访问数组来完成此操作，最后一项的索引等于jsonData.seats.length-1
simply:
简单地：
var countryId = jsonData.seats[jsonData.seats.length-1].countryid
回答by iuliu.net
Try this:
尝试这个：
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
