如何修改/重新转换JSON数组结构

Question

[{"id":"15","heading":"Post1","content":"Post 1 Content","date":"2016-11-09 08:51:37"},
{"id":"16","heading":"Post2","content":"Post 2 Content","date":"2016-11-09 08:52:09"},
{"id":"17","heading":"Post3","content":"Post 3 Content","date":"2015-06-09 08:52:09"}]

我有JSON数组.我试图将其转换为JSON对象

2016
    Nov
        Post1
        Post2
2015
   June
        Post3

我能够在PHP中实现这一目标

while ($row = mysqli_fetch_row($result)) {
    $year = date('Y', strtotime($row['2']));
    $month = date('M', strtotime($row['2']));
    $navarray[$year][$month][] = array($row[0], $row[1], $row[3]);
}

但是无法在JS中弄明白.

Answer 1

与 PHP 不同，如果对象不存在，您必须创建它们：

var monthNames = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]

ar = [{"id":"15","heading":"Post1","content":"Post 1 Content","date":"2016-11-09 08:51:37"},
{"id":"16","heading":"Post2","content":"Post 2 Content","date":"2016-11-09 08:52:09"},
{"id":"17","heading":"Post3","content":"Post 3 Content","date":"2015-06-09 08:52:09"}]

obj = {}
ar.forEach(function(v) {
  d = new Date(v.date);
  m = monthNames[d.getMonth()]
  if (!obj.hasOwnProperty(d.getFullYear())) {
    obj[d.getFullYear()] = {}
  }
  if (!obj[d.getFullYear()].hasOwnProperty(m)) {
    obj[d.getFullYear()][m] = []
  }
  obj[d.getFullYear()][m].push(v.heading)
})
console.log(obj)