Javascript 将数组项推送到命名索引

Question

我有一个 JSON 数组:

[{ id: 1, client: "Microsoft" },{ id: 2, client: "Microsoft" },{ id: 3, client: "Apple" }]

我想按“客户端”对其进行分组，但我在 javascript 中遇到了困难。在 PHP 中我通常会做这样的事情:

$group = array();

foreach ($array as $item) {

    $group[ $item['client'] ] = $item;

}

return $group;

但是这个方法在多维数组的 javascript 中完全不起作用

var group = [];

for ( i=0 ... ) {

  var client = array[i].client;

  group[ client ].push( array[i] );

}

我如何将上面的数组分组为这样的:

[{ "Microsoft": [{...}], "Apple":[{...}] }]

甚至

[{ client: "Microsoft", "items": [{...}] }, { client: "Apple", items: [{...}] }]

Answer 1

为此，您需要一个对象，而不是数组:

var array = [{ id: 1, client: "Microsoft" },{ id: 2, client: "Microsoft" },{ id: 3, client: "Apple" }];
var group = {};
for (var i=0; i<array.length; i++) {
  var client = array[i].client;
  group[client] = group[client] || []; // create array for client if needed
  group[client].push(array[i]);
}
console.log(group);

请务必记住，生成的对象将包含对原始数组中对象的引用。例如:

array[0].id = 100;
group.Microsoft[0].id; // 100