const area = { "동서울":["관악구", "강남구", "성동구","중량구"], "북서울":["강북구", "성북구", "도봉구", "노원구"] }; let index = []; for (var x in area) { index.push(x); } index.sort(function (a, b) { return a == b ? 0 : (a > b ? 1 : -1); }); document.querySelector('.text').innerText=area[index[1]][3];
