我想id按值在深层嵌套对象中找到一个对象。我尝试用递归来做，但无法弄清楚为什么“未定义”。在这段代码中，我在控制台"final result: 234324234"中有正确的代码，但由于某种原因，这个结果没有从这个函数返回。请看一下。let obj = { "uuid": "344444", "entityName": "priceFormationPhase", "id": 2, "value": "foo", "children": { "4": { "uuid": "44444", "entityName": "organization", "id": 4, "value": "ffffff", "children": { "344534": { "uuid": "33333", "entityName": "contract", "id": 928688, "value": "dh", "children": { "345345": { "uuid": "222222222", "entityName": "contractPhase", "id": 234324234, "value": "111", "children": {} } } } } } }};function findContractStage(obj) { if ((typeof obj.children === 'object') && (Object.keys(obj.children).length > 0)) { findContractStage(obj.children); } else if (typeof obj[Object.keys(obj)[0]] === 'object') { findContractStage(obj[Object.keys(obj)[0]]); } else if (obj.entityName) { console.log(`final result: ${obj.id}`); return obj.id; }}let contractStageId = findContractStage(obj);console.log(`contractStageId: ${contractStageId}`);
3 回答
泛舟湖上清波郎朗
TA贡献1818条经验 获得超3个赞
你忘记return了功能
let obj = {
"uuid": "344444",
"entityName": "priceFormationPhase",
"id": 2,
"value": "foo",
"children": {
"4": {
"uuid": "44444",
"entityName": "organization",
"id": 4,
"value": "ffffff",
"children": {
"344534": {
"uuid": "33333",
"entityName": "contract",
"id": 928688,
"value": "dh",
"children": {
"345345": {
"uuid": "222222222",
"entityName": "contractPhase",
"id": 234324234,
"value": "111",
"children": {}
}
}
}
}
}
}
};
function findContractStage(obj) {
if ((typeof obj.children === 'object') && (Object.keys(obj.children).length > 0)) {
return findContractStage(obj.children);
} else if (typeof obj[Object.keys(obj)[0]] === 'object') {
return findContractStage(obj[Object.keys(obj)[0]]);
} else if (obj.entityName) {
console.log(`final result: ${obj.id}`);
return obj.id;
}
}
let contractStageId = findContractStage(obj);
console.log(`contractStageId: ${contractStageId}`);
慕侠2389804
TA贡献1719条经验 获得超6个赞
您不会返回递归时获得的值。尝试这个：
let obj = {
"uuid": "344444",
"entityName": "priceFormationPhase",
"id": 2,
"value": "foo",
"children": {
"4": {
"uuid": "44444",
"entityName": "organization",
"id": 4,
"value": "ffffff",
"children": {
"344534": {
"uuid": "33333",
"entityName": "contract",
"id": 928688,
"value": "dh",
"children": {
"345345": {
"uuid": "222222222",
"entityName": "contractPhase",
"id": 234324234,
"value": "111",
"children": {}
}
}
}
}
}
}
};
function findContractStage(obj) {
if ((typeof obj.children === 'object') && (Object.keys(obj.children).length > 0)) {
return findContractStage(obj.children);
} else if (typeof obj[Object.keys(obj)[0]] === 'object') {
return findContractStage(obj[Object.keys(obj)[0]]);
} else if (obj.entityName) {
console.log(`final result: ${obj.id}`);
return obj.id;
}
}
let contractStageId = findContractStage(obj);
console.log(`contractStageId: ${contractStageId}`);
暮色呼如
TA贡献1853条经验 获得超9个赞
您需要在递归调用之前添加“返回”
return findContractStage(obj.children);
和
return findContractStage(obj[Object.keys(obj)[0]]);
因此，您的递归函数会尽可能深入并返回您的 id 值。
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