Javascript：在 JSON 中查找键及其值
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Javascript: Find key and its value in JSON
提问by AmazingDayToday
I have a JSON object that is returned in different ways, but always has key. How can I get it?
我有一个以不同方式返回的 JSON 对象，但总是有key. 我怎么才能得到它？
E.g.
例如
"Records": {
"key": "112"
}
Or
或者
"Records": {
"test": {
"key": "512"
}
}
Or even in array:
甚至在数组中：
"Records": {
"test": {
"test2": [
{
"key": "334"
}
]
}
}
Tried several options, but still can't figure out (
尝试了几个选项，但仍然无法弄清楚（
采纳答案by Shobhit Walia
I will not write the code for you but give you an idea may be it will help, First convert JSON object in to string using
我不会为您编写代码，但给您一个想法可能会有所帮助，首先使用将 JSON 对象转换为字符串
JSON.stringify(obj);
after that search for Key using indexOf() method. Extract previous '{' and Next '}' string and again cast in to JSON object. using
在使用 indexOf() 方法搜索 Key 之后。提取上一个 '{' 和下一个 '}' 字符串并再次转换为 JSON 对象。使用
var obj = JSON.parse(string);
Then
然后
var value = obj.key
回答by Maciej Kozieja
I think this migth be solution (asuming key is always string and you don't care about res of data)
我认为这可能是解决方案（假设键始终是字符串并且您不关心数据的 res ）
const data = [`"Records": {
"test": {
"test2": [
{
"key": "334",
"key": "3343"
}
]
}
}`, `"Records": {
"test": {
"key": "512"
}
}`, `"Records": {
"key": "112"
}`]
const getKeys = data => {
const keys = []
const regex = /"key"\s*:\s*"(.*)"/g
let temp
while(temp = regex.exec(data)){
keys.push(temp[1])
}
return keys
}
for(let json of data){
console.log(getKeys(json))
}回答by Грозный
How can i get it?
我怎么才能得到它？
Recursively! e.g.
递归！例如
function getKey(rec) {
if (rec.key) return rec.key;
return getKey(rec[Object.keys(rec)[0]]);
}
回答by Nina Scholz
You could use an iterative and recursive approach for getting the object with keyin it.
您可以使用迭代和递归方法来获取其中的对象key。
function getKeyReference(object) {
function f(o) {
if (!o || typeof o !== 'object') {
return;
}
if ('key' in o) {
reference = o;
return true;
}
Object.keys(o).some(function (k) {
return f(o[k]);
});
}
var reference;
f(object);
return reference;
}
var o1 = { Records: { key: "112" } },
o2 = { Records: { test: { key: "512" } } },
o3 = { Records: { test: { test2: [{ key: "334" }] } } };
console.log(getKeyReference(o1));
console.log(getKeyReference(o2));
console.log(getKeyReference(o3));回答by Tan
You can try this
你可以试试这个
const data = {
"Records": {
"key": "112"
}
};
const data2 = {
"Records": {
"test": { "key": "512" }
}
};
const data3 = {
"Records": {
"test": {
"test2": [
{ "key": "334" },
]
}
}
};
function searchKey(obj, key = 'key') {
return Object.keys(obj).reduce((finalObj, objKey) => {
if (objKey !== key) {
return searchKey(obj[objKey]);
} else {
return finalObj = obj[objKey];
}
}, [])
}
const result = searchKey(data);
const result2 = searchKey(data2);
const result3 = searchKey(data3);
console.log(result);
console.log(result2);
console.log(result3);