如何获取JSON对象中的所有键(javascript)

Question

{"document":
  {"people":[
    {"name":["Harry Potter"],"age":["18"],"gender":["Male"]},
    {"name":["hermione granger"],"age":["18"],"gender":["Female"]},
  ]}
}

从这个JSON例子,我想拿到钥匙,例如name,age,gender每个人.

这该怎么做？

Answer 1

我使用Object.keysJavaScript内置的内容,它将从给定的对象MDN Reference返回一个键数组

var obj = {name: "Jeeva", age: "22", gender: "Male"}
console.log(Object.keys(obj))

Answer 2

试试这个

var s = {name: "raul", age: "22", gender: "Male"}
   var keys = [];
   for(var k in s) keys.push(k);

这里的键数组将返回你的键 ["name", "age", "gender"]

Answer 3

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);

Answer 4

当天的ES6；

const json_getAllKeys = data => (
  data.reduce((keys, obj) => (
    keys.concat(Object.keys(obj).filter(key => (
      keys.indexOf(key) === -1))
    )
  ), [])
)

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)), [])

编辑：如果输入是对象数组类型，则返回所有一阶键