如何从JSON中获得计数的数量,包括javascript中的重复项
How to get the number of count including the duplicates in javascript from JSON?
JSON如下,
var json =
[
{"cardAid":"ALPHG","displayName":"ALPHG","SequenceNumber":"0","port":"A"},
{"cardAid":"ALPHG","displayName":"ALPHG","SequenceNumber":"1","port":"B"},
{"cardAid":"SFD","displayName":"SFD","SequenceNumber":"2","port":"C"},
{"cardAid":"SFD","displayName":"SFD","SequenceNumber":"3","port":"D"},
{"cardAid":"ALPHG","displayName":"ALPHG","SequenceNumber":"4","port":"E"},
{"cardAid":"ALPHG","displayName":"ALPHG","SequenceNumber":"5","port":"F"},
{"cardAid":"BETA","displayName":"BETA","SequenceNumber":"6","port":"G"}
];
我使用代码从这个链接解析这个JSON,在javascript中从JSON中获得计数的数量?
function count(arr) {
var map = {};
for (var i = 0; i < arr.length; i++) {
var name = arr[i].cardAid;
var port = arr[i].port;
if (name in map){
map[name].Count++;
map[name].Port += ',' + port;
} else {
map[name] = { Count: 1, Port: port };
}
}
return map;
}
这个函数使用cardAid作为键来解析JSON,并给出如下输出:
{
ALPHG: { Count: 4, Port: "A,B,E,F" },
SFD: { Count: 2, Port: "C,D" },
BETA: { Count: 1, Port: "G" }
}
但是我需要基于JSON中的SequenceNumber的输出,
{
ALPHG: { Count: 2, Port: "A,B" },
SFD: { Count: 2, Port: "C,D" },
ALPHG: { Count: 2, Port: "E,F" },
BETA: { Count: 1, Port: "G" }
}
我怎么能把这个重复的名字在地图上基于JSON的SequenceNumber
这可能接近您的想法(jsfiddle),我选择将Port作为数组而不是字符串。但我有点困惑,因为SequenceNumber在这个逻辑中没有影响,也许元素应该先由SequenceNumber排序?
function count(data) {
var result = {};
for (var i = 0; i < data.length; ++i) {
var cardAid = data[i].cardAid;
if (!(cardAid in result)) {
result[cardAid] = [];
}
// Check if a new "sequence" needs to be created
if (i == 0 || data[i-1].cardAid != cardAid) {
result[cardAid].push({ Count: 0, Port: [] });
}
// Append item to the latest sequence
var lastIndex = result[cardAid].length - 1;
++result[cardAid][lastIndex].Count;
result[cardAid][lastIndex].Port.push(data[i].port);
}
return result;
}
结果:{
"ALPHG": [
{
"Count": 2,
"Port": [ "A", "B" ]
},
{
"Count": 2,
"Port": [ "E", "F" ]
}
],
"SFD": [
{
"Count": 2,
"Port": [ "C", "D" ]
}
],
"BETA": [
{
"Count": 1,
"Port": [ "G" ]
}
]
}
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