如何获取 JSON 对象中的所有键 (javascript)
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How to get all key in JSON object (javascript)
提问by Hikaru Shindo
{"document":
{"people":[
{"name":["Harry Potter"],"age":["18"],"gender":["Male"]},
{"name":["hermione granger"],"age":["18"],"gender":["Female"]},
]}
}
From this JSON example, I would like to get the keys such as name, age, genderfor each people.
从这个JSON例子，我想拿到钥匙，例如name，age，gender每个人。
How to do this?
这该怎么做？
采纳答案by Rahul G Nair
Try this
尝试这个
var s = {name: "raul", age: "22", gender: "Male"}
var keys = [];
for(var k in s) keys.push(k);
Here keys array will return your keys ["name", "age", "gender"]
这里的键数组将返回您的键 ["name", "age", "gender"]
回答by Jeeva
I use Object.keyswhich is built into JavaScript Object, it will return an array of keys from given object MDN Reference
我使用Object.keys内置于 JavaScript 对象中的它，它将从给定的对象返回一组键MDN 参考
var obj = {name: "Jeeva", age: "22", gender: "Male"}
console.log(Object.keys(obj))
回答by BatScream
var input = {"document":
{"people":[
{"name":["Harry Potter"],"age":["18"],"gender":["Male"]},
{"name":["hermione granger"],"age":["18"],"gender":["Female"]},
]}
}
var keys = [];
for(var i = 0;i<input.document.people.length;i++)
{
Object.keys(input.document.people[i]).forEach(function(key){
if(keys.indexOf(key) == -1)
{
keys.push(key);
}
});
}
console.log(keys);
回答by user3487453
ES6 of the day here;
今天的 ES6 在这里；
const json_getAllKeys = data => (
data.reduce((keys, obj) => (
keys.concat(Object.keys(obj).filter(key => (
keys.indexOf(key) === -1))
)
), [])
)
And yes it can be written in very long one line;
是的，它可以写成很长的一行；
const json_getAllKeys = data => data.reduce((keys, obj) => keys.concat(Object.keys(obj).filter(key => keys.indexOf(key) === -1)), [])
EDIT: Returns all first order keys if the input is of type array of objects
编辑：如果输入是对象数组类型，则返回所有一阶键
