js獲取json對象的key值

let obj = { id: 1, type: 'daa', name: "asjd" };
let keys = [];
for (var key in obj) {
　　keys.push(key);
}
console.log(keys);
//["id", "type", "name"]

這樣就能獲取到對象的key

然后用obj[key]能獲取到對應key的值

 

取對象的第一個值

obj[Object.keys(obj)[0]]

Object.keys()可以獲取對象的所有key。返回一個數組

Object是無序的

let message = {
              title: "",
              time: '',
            }

message[Object.keys(message)[0]]