as long as the b1 attribute has the same value, throw the same later into the children array
let obj = [{"a1": "bbb", "b1": "jkk"}, {"a1": "ccc", "b1": "jkp"}, {"a1": "ddd", "b1": "jkk"}, {"a1": "eee", "b1": "jkk"},...];
//
[{
"a1": "bbb",
"b1": "jkk",
children: [{
"a1": "ddd",
"b1": "jkk"
},{
"a1": "eee",
"b1": "jkk"
}],
}, {
"a1": "ccc",
"b1": "jkp"
}];
let obj = [{'a1': 'bbb', 'b1': 'jkk'}, {'a1': 'ccc', 'b1': 'jkp'}, {'a1': 'ddd', 'b1': 'jkk'}, {'a1': 'eee', 'b1': 'jkk'}];
function dealObj(obj) {
let keyIndex = {}, objItem, result = [], index;
for (let i = 0; i < obj.length; iPP) {
objItem = obj[i];
if (undefined === keyIndex[objItem.b1]) {
index = result.length;
keyIndex[objItem.b1] = index;
result.push(objItem);
} else {
index = keyIndex[objItem.b1];
if (undefined === result[index].children) result[index].children = [];
result[index].children.push(objItem);
}
}
return result;
}
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