javascript - 嵌套循环未形成完整对象-问题

我有一个array of objects如下：

[
  {
    "__v": 0,
    "_id": "5634fa3df925a0ac02f1b0fa",
    "groupname": "group 1",
    "subgroups": [
      {
        "__v": 0,
        "_id": "5634fa63f925a0ac02f1b0fc",
        "subgroupname": "subgroup 1",
        "books": [
          {
            "bookname": {
              "name": "sasasasasasP"
            }
         }
        ]
    ]
  },
  {
    "__v": 0,
    "_id": "5634fa3df925a0ac02f1b0fd",
    "groupname": "group 2",
    "subgroups": [
      {
        "__v": 0,
        "_id": "5634fa63f925a0ac02f1befc",
        "subgroupname": "subgroup 2",
        "books": [
          {
            "bookname": {
              "name": "book 2"
            }
         }
        ]
    ]
  }
]

我想从上面的对象在下面形成一个array of objects。

[
    {
        "groupname": "Group 1",
        "subgroupname": "subgroup 1",
        "bookname": "Enersol"
    },
    {
        "groupname": "Group 2",
        "subgroupname": "subgroup 2",
        "bookname": "Enersol"
    }
]

以下是我尝试过的方法，但是在数组内形成第一个对象后，循环失败。

var apiListData = [];
for (var i = 0, len = groups.length; i < len; i++) {
    for (var j = 0, len = groups[i].subgroups.length; j < len; j++) {
        for (var k = 0, len = groups[i].subgroups[j].books.length; k < len; k++) {
            apiListData.push({
                gname: groups[i].groupname,
                sname: groups.[i].subgroups[j].subgroupname,
                bookname: groups[i].subgroups[j].books[k].bookname
            })
        }
    }
}

最佳答案

请看看http://jsfiddle.net/es47k33o/

这里有很多错误：


您提供的JSON结构非常混乱，其固定在小提琴中
错字：sname: groups.[i].subgroups[j].subgroupname中的点太多
要访问书名的字符串值，您必须比bookname: groups[i].subgroups[j].books[k].bookname更深一层
您实际的算法问题是，您总是要重新声明变量len。我根据它们各自的索引重命名了第二个和第三个：

var apiListData = [];
for (var i = 0, len = groups.length; i < len; i++) {
	for (var j = 0, lenj = groups[i].subgroups.length; j < lenj; j++) {
		for (var k = 0, lenk = groups[i].subgroups[j].books.length; k < lenk; k++) {
			apiListData.push({
				gname: groups[i].groupname,
				sname: groups[i].subgroups[j].subgroupname,
				bookname: groups[i].subgroups[j].books[k].bookname.name
			})
		}
	}
}

关于javascript - 嵌套循环未形成完整对象-问题，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/33458008/