关于js对象键顺序的更改

var data = {
			first: {
				'name': 'zhangsan',
				'id': 99,
				'sex': 'nan',
				'age': 19,
				
			},
			second: {
				'name': '李四',
				'sex': '女',
				'id': 108,
				'age': 25
			}
		}
		var obj = {};
		for(var i in data) {
			obj = {
				"id": data[i]['id'],
				"name": data[i]['name'],
				"age": data[i]['age'],
				'sex': data[i]['sex']
			}
			data[i] = obj;
		}
		console.log(data);