js 递归对象的时候没有返回值，这是怎么回事？
// 找出对应 id 的 name，obj是后台返回的json数据格式，是深部不同的数组
function getUname(lists, id) {
const hasChildrenAttr = function (obj) {
return obj.child !== undefined
}
lists.forEach(list => {
console.log(list.orgnization_id,id)
if (list.orgnization_id == id) {
console.log(list) //此处可以打印
return list
} else {
if (hasChildrenAttr(list)) {
if (list.child && list.child.length > 0){
return getUname(list.child, id)
}
}
}
})
}
console.log(getUname(obj,"9"))
foreach函数没有返回值。
map函数有返回值。
forEach只是遍历，回调中的return只是遍历时传递的匿名函数的返回值，而非getUname的返回值，改成下面这种结构就行了
// 找出对应 id 的 name，obj是后台返回的json数据格式，是深部不同的数组
function getUname(lists, id) {
const hasChildrenAttr = function (obj) {
return obj.child !== undefined
}
var result = null;////////
lists.forEach(list => {
if (list.orgnization_id == id) {
result = list/////
} else if (!result) {////
if (hasChildrenAttr(list)) {
if (list.child && list.child.length > 0) {
result = getUname(list.child, id)
}
}
}
});
return result;//////////
}
/////////////测试数据
obj = [{"orgnization_id":"2","orgnization_name":"\u6cb3\u5317\u7701","orgnization_code":"101","orgnization_parentid":"0","orgnization_depth":"0","orgnization_childstr":"2,7,8,9,10,11,12,13,14,15,19,20,21,24","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":[{"orgnization_id":"7","orgnization_name":"\u77f3\u5bb6\u5e84","orgnization_code":"106","orgnization_parentid":"2","orgnization_depth":"2","orgnization_childstr":"7,12,13,14,15,19,20","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":[{"orgnization_id":"12","orgnization_name":"\u8f9b\u96c6","orgnization_code":"111","orgnization_parentid":"7","orgnization_depth":"3","orgnization_childstr":"12,13,14,15,19,20","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":[{"orgnization_id":"13","orgnization_name":"\u5357\u667a\u90b1","orgnization_code":"112","orgnization_parentid":"12","orgnization_depth":"4","orgnization_childstr":"13,14,15,19,20","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":[{"orgnization_id":"14","orgnization_name":"\u738b\u53e3\u9547","orgnization_code":"113","orgnization_parentid":"13","orgnization_depth":"5","orgnization_childstr":"14,19,15","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":[{"orgnization_id":"15","orgnization_name":"\u96f7\u5bb6\u5e84\u6751","orgnization_code":"114","orgnization_parentid":"14","orgnization_depth":"6","orgnization_childstr":"15","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":null},{"orgnization_id":"19","orgnization_name":"\u7ff0\u6797\u5e84","orgnization_code":"118","orgnization_parentid":"14","orgnization_depth":"6","orgnization_childstr":"19","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":null}]},{"orgnization_id":"20","orgnization_name":"\u90ed\u897f\u9547","orgnization_code":"119","orgnization_parentid":"13","orgnization_depth":"5","orgnization_childstr":"20","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":null}]}]}]},{"orgnization_id":"8","orgnization_name":"\u4fdd\u5b9a","orgnization_code":"107","orgnization_parentid":"2","orgnization_depth":"2","orgnization_childstr":"8,24","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":[{"orgnization_id":"24","orgnization_name":"\u5f90\u6c34","orgnization_code":"123","orgnization_parentid":"8","orgnization_depth":"3","orgnization_childstr":"24","orgnization_areacode":null,"orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":null}]},{"orgnization_id":"9","orgnization_name":"\u8861\u6c34","orgnization_code":"108","orgnization_parentid":"2","orgnization_depth":"2","orgnization_childstr":"9,21","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":[{"orgnization_id":"21","orgnization_name":"\u6843\u57ce","orgnization_code":"120","orgnization_parentid":"9","orgnization_depth":"3","orgnization_childstr":"21","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":null}]},{"orgnization_id":"10","orgnization_name":"\u90a2\u53f0","orgnization_code":"109","orgnization_parentid":"2","orgnization_depth":"2","orgnization_childstr":"10","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":null},{"orgnization_id":"11","orgnization_name":"\u6ca7\u5dde","orgnization_code":"110","orgnization_parentid":"2","orgnization_depth":"2","orgnization_childstr":"11","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":null}]},{"orgnization_id":"3","orgnization_name":"\u9655\u897f\u7701","orgnization_code":"102","orgnization_parentid":"0","orgnization_depth":"0","orgnization_childstr":"3,18","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":[{"orgnization_id":"18","orgnization_name":"\u897f\u5b89","orgnization_code":"117","orgnization_parentid":"3","orgnization_depth":"2","orgnization_childstr":"18","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":null}]},{"orgnization_id":"4","orgnization_name":"\u5c71\u897f\u7701","orgnization_code":"103","orgnization_parentid":"0","orgnization_depth":"0","orgnization_childstr":"4,17","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":[{"orgnization_id":"17","orgnization_name":"\u592a\u539f","orgnization_code":"116","orgnization_parentid":"4","orgnization_depth":"2","orgnization_childstr":"17","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":null}]},{"orgnization_id":"5","orgnization_name":"\u5c71\u4e1c\u7701","orgnization_code":"104","orgnization_parentid":"0","orgnization_depth":"0","orgnization_childstr":"5,16","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":[{"orgnization_id":"16","orgnization_name":"\u70df\u53f0","orgnization_code":"115","orgnization_parentid":"5","orgnization_depth":"2","orgnization_childstr":"16","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":null}]},{"orgnization_id":"6","orgnization_name":"\u6cb3\u5357\u7701","orgnization_code":"105","orgnization_parentid":"0","orgnization_depth":"0","orgnization_childstr":"6","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":null},{"orgnization_id":"22","orgnization_name":"\u65b0\u7586","orgnization_code":"121","orgnization_parentid":"0","orgnization_depth":"0","orgnization_childstr":"22,23","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":[{"orgnization_id":"23","orgnization_name":"\u4e4c\u9c81\u6728\u9f50","orgnization_code":"122","orgnization_parentid":"22","orgnization_depth":"2","orgnization_childstr":"23","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":null}]}];
/////////////
console.log(getUname(obj, "9"))
</script>
有帮助或启发麻烦点下【采纳该答案】，谢谢~~有其他问题可以继续交流~
还是不行直接返回null，这是我用的测试数据，那您看一下
[{"orgnization_id":"2","orgnization_name":"\u6cb3\u5317\u7701","orgnization_code":"101","orgnization_parentid":"0","orgnization_depth":"0","orgnization_childstr":"2,7,8,9,10,11,12,13,14,15,19,20,21,24","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":[{"orgnization_id":"7","orgnization_name":"\u77f3\u5bb6\u5e84","orgnization_code":"106","orgnization_parentid":"2","orgnization_depth":"2","orgnization_childstr":"7,12,13,14,15,19,20","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":[{"orgnization_id":"12","orgnization_name":"\u8f9b\u96c6","orgnization_code":"111","orgnization_parentid":"7","orgnization_depth":"3","orgnization_childstr":"12,13,14,15,19,20","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":[{"orgnization_id":"13","orgnization_name":"\u5357\u667a\u90b1","orgnization_code":"112","orgnization_parentid":"12","orgnization_depth":"4","orgnization_childstr":"13,14,15,19,20","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":[{"orgnization_id":"14","orgnization_name":"\u738b\u53e3\u9547","orgnization_code":"113","orgnization_parentid":"13","orgnization_depth":"5","orgnization_childstr":"14,19,15","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":[{"orgnization_id":"15","orgnization_name":"\u96f7\u5bb6\u5e84\u6751","orgnization_code":"114","orgnization_parentid":"14","orgnization_depth":"6","orgnization_childstr":"15","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":null},{"orgnization_id":"19","orgnization_name":"\u7ff0\u6797\u5e84","orgnization_code":"118","orgnization_parentid":"14","orgnization_depth":"6","orgnization_childstr":"19","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":null}]},{"orgnization_id":"20","orgnization_name":"\u90ed\u897f\u9547","orgnization_code":"119","orgnization_parentid":"13","orgnization_depth":"5","orgnization_childstr":"20","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":null}]}]}]},{"orgnization_id":"8","orgnization_name":"\u4fdd\u5b9a","orgnization_code":"107","orgnization_parentid":"2","orgnization_depth":"2","orgnization_childstr":"8,24","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":[{"orgnization_id":"24","orgnization_name":"\u5f90\u6c34","orgnization_code":"123","orgnization_parentid":"8","orgnization_depth":"3","orgnization_childstr":"24","orgnization_areacode":null,"orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":null}]},{"orgnization_id":"9","orgnization_name":"\u8861\u6c34","orgnization_code":"108","orgnization_parentid":"2","orgnization_depth":"2","orgnization_childstr":"9,21","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":[{"orgnization_id":"21","orgnization_name":"\u6843\u57ce","orgnization_code":"120","orgnization_parentid":"9","orgnization_depth":"3","orgnization_childstr":"21","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":null}]},{"orgnization_id":"10","orgnization_name":"\u90a2\u53f0","orgnization_code":"109","orgnization_parentid":"2","orgnization_depth":"2","orgnization_childstr":"10","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":null},{"orgnization_id":"11","orgnization_name":"\u6ca7\u5dde","orgnization_code":"110","orgnization_parentid":"2","orgnization_depth":"2","orgnization_childstr":"11","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":null}]},{"orgnization_id":"3","orgnization_name":"\u9655\u897f\u7701","orgnization_code":"102","orgnization_parentid":"0","orgnization_depth":"0","orgnization_childstr":"3,18","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":[{"orgnization_id":"18","orgnization_name":"\u897f\u5b89","orgnization_code":"117","orgnization_parentid":"3","orgnization_depth":"2","orgnization_childstr":"18","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":null}]},{"orgnization_id":"4","orgnization_name":"\u5c71\u897f\u7701","orgnization_code":"103","orgnization_parentid":"0","orgnization_depth":"0","orgnization_childstr":"4,17","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":[{"orgnization_id":"17","orgnization_name":"\u592a\u539f","orgnization_code":"116","orgnization_parentid":"4","orgnization_depth":"2","orgnization_childstr":"17","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":null}]},{"orgnization_id":"5","orgnization_name":"\u5c71\u4e1c\u7701","orgnization_code":"104","orgnization_parentid":"0","orgnization_depth":"0","orgnization_childstr":"5,16","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":[{"orgnization_id":"16","orgnization_name":"\u70df\u53f0","orgnization_code":"115","orgnization_parentid":"5","orgnization_depth":"2","orgnization_childstr":"16","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":null}]},{"orgnization_id":"6","orgnization_name":"\u6cb3\u5357\u7701","orgnization_code":"105","orgnization_parentid":"0","orgnization_depth":"0","orgnization_childstr":"6","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":null},{"orgnization_id":"22","orgnization_name":"\u65b0\u7586","orgnization_code":"121","orgnization_parentid":"0","orgnization_depth":"0","orgnization_childstr":"22,23","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":[{"orgnization_id":"23","orgnization_name":"\u4e4c\u9c81\u6728\u9f50","orgnization_code":"122","orgnization_parentid":"22","orgnization_depth":"2","orgnization_childstr":"23","orgnization_areacode":"0","orgnization_organattrcode":null,"orgnization_techbz":"0","orgnization_orgstructurename":null,"child":null}]}]
forEach是没有走完return就停止循环的概念的，我们写在它里面的只是它的回调，
所以在做这种递归的时候，你已经找到了你想要的值，但forEach没停，它会用新的值给你覆盖掉
讲道理，个人认为这个函数本身是不太适合做回调的哈，当嵌套层数较深的时候，会造成大量不必要的循环次数。
建议可以用for循环来做这个事，比如（简洁明快、只要找到目标、即刻终止循环）：
function getUname(lists, id) {
let result =''
const findName = (list) => {
for (let key in list) {
const item = list[key]
if (item['orgnization_id'] === id) result = item['orgnization_name']
if (item['child']) findName(item['child'])
}
}
findName(lists)
return result
}
for循环是很强大的工具哦，不要忘记它~