新的javascript数组从json数组只从第一个值

Question

我有这个JSON数组:

const arr = [ 
{ data: '250', name: 'john' },
{ data: '251', name: 'john' }
]:

我怎么能从它得到，一个新的数组有[250, 251]?

我不能解决这个问题。

Answer 1

let arr = [ { data: '250', name: 'john' }, { data: '251', name: 'john' } ];
let result = arr.map((x) => x.data);
console.log(result);

Answer 2

let arr = [
{ data: "250", name: "john" },
{ data: "251", name: "john" },
];
let result = arr.map((x) => x.data);
console.log(result);
let list = [];
for (let i = 0; i < arr.length; i++) {
list.push(arr[i].data);
}
console.log(list);