label for value in array
選擇的是:{{ role1.name + '(' + role1.age + ')' }}
select as label for value in array
選擇的是:{{ role2 }}
label group by group for value in array
選擇的是:{{ role3.name + '(' + role3.age + ')' }}
select as label group by group for value in array track by trackexpr
選擇的是:{{ role4.name + '(' + role4.age + ')' }}