In a recursive array, a field below that level is returned according to the characteristic ID,
problem description
data is a recursive tree
you need to find out the name under the url according to the unique key url
the environmental background of the problems and what methods you have tried
related codes
/ / Please paste the code text below (do not replace the code with pictures)
[{
"menuUrl":1,
"name":"666",
"menuList":[{
"menuUrl":3,
"name":"hhaha",
"menuList":[{
"menuUrl":8,
"name":"jajja",
"menuList":[]
}]
}]
},{
"menuUrl":88,
"name":"ksls",
"menuList":[{
"menuUrl":55,
"name":6,
"menuList":[]
}]
}]
findNameByUrl (menuUrl,data) = = > return name
for example, I, findNameByUrl (8heroin data) expect to get jajja
not very elegant, main part:
let result;
function findNameByUrl(arr, url) {
//
arr.forEach(element => {
if (element.menuUrl == url) {
//
result = element.name;
}else if (element.menuList) {
//
findNameByUrl(element.menuList, url);
}
});
}
complete testable code:
let arr = [{
"menuUrl": 1,
"name": "666",
"menuList": [{
"menuUrl": 3,
"name": "hhaha",
"menuList": [{
"menuUrl": 8,
"name": "jajja",
"menuList": []
}]
}]
}, {
"menuUrl": 88,
"name": "ksls",
"menuList": [{
"menuUrl": 55,
"name": 6,
"menuList": []
}]
}];
let result;
function findNameByUrl(arr, url) {
//
arr.forEach(element => {
if (element.menuUrl == url) {
//
result = element.name;
}else if (element.menuList) {
//
findNameByUrl(element.menuList, url);
}
});
}
findNameByUrl(arr, 8);
console.log(result);
let arr = [{
"menuUrl": 1,
"name": "666",
"menuList": [{
"menuUrl": 3,
"name": "hhaha",
"menuList": [{
"menuUrl": 8,
"name": "jajja",
"menuList": []
}]
}]
}, {
"menuUrl": 88,
"name": "ksls",
"menuList": [{
"menuUrl": 55,
"name": 6,
"menuList": []
}]
}]
let crr = [];
let str = 8;
function Fn(arr, callback, crr) {
arr.forEach(element => {
for (let key in element) {
if (key === "menuList") {
Fn(element[key], callback, crr);
} else {
if (key === "menuUrl") {
if (callback(element[key])) {
crr.push(element[key]);
}
}
}
}
});
return crr;
}
Fn(arr, function(data) {
if (data === str) {
return true;
}
}, crr);
console.log(crr);
var data = [{
"menuUrl": 1,
"name": "666",
"menuList": [{
"menuUrl": 3,
"name": "hhaha",
"menuList": [{
"menuUrl": 8,
"name": "jajja",
"menuList": []
}]
}]
}, {
"menuUrl": 88,
"name": "ksls",
"menuList": [{
"menuUrl": 55,
"name": 6,
"menuList": []
}]
}];
function findNameByUrl(url, data) {
var s = JSON.stringify(data), ss = s.split('menuUrl":' + url + ',"name":');
if (ss.length == 2) {
var x = ss[1], y = x.substr(0, x.indexOf(','));
if (y[0] == '"') {
y = y.substr(1, y.length - 2);
}
return y;
}
}
console.log(findNameByUrl(8, data));
