将javascript项按一个属性分组

要知道您想要的确切结果结构有点困难。

此代码:

       // Split values into arrays
Code = Code.split('*');
Name = Name.split('*');
ids = ids.split('*');

       // cache the length of one and create the result object
var length = Code.length;
var result = {};

       // Iterate over each array item
       // If we come across a new code, 
       //    add it to result with an empty array
for(var i = 0; i < length; i++) {
    if(Code[i] in result == false) {
        result[ Code[i] ] = [];
    }
            // Push a new object into the Code at "i" with the Name and ID at "i"
    result[ Code[i] ].push({ name:Name[i], id:ids[i] });
}

将产生这种结构:

// Resulting object
{
      // A12 has array with one object
    A12: [ {id: "1", name: "John"} ],

      // B22 has array with two objects
    B22: [ {id: "2", name: "Brain"},
           {id: "3", name: "Andy"}
         ]
}

1. 将字符串拆分为“*”,这样您就有了3个数组。
2. 从每个数组的类似索引元素构建对象。
3. 在构建这些对象时,为每个“代码”值收集包含数组的第二个对象。

代码:

function toGroups(ids, names, codes) {
  ids = ids.split('*');
  names = names.split('*');
  codes = codes.split('*');
  if (ids.length !== names.length || ids.length !== codes.length)
    throw "Invalid strings";

  var objects = [], groupMap = {};
  for (var i = 0; i < ids.length; ++i) {
    var o = { id: ids[i], name: names[i], code: code[i] };
    objects.push(o);
    if (groupMap[o.code]) {
      groupMap[o.code].push(o);
    else
      groupMap[o.code] = [o];
  }
  return { objects: objects, groupMap: groupMap };
}

您所说的“两个数组”将位于该函数返回的对象的“groupmap”属性中。