每次都觉得很神奇的JS

var staff = [
{name: 'abruzzi', age: 24},
{name: 'bajmine', age: 26},
{name: 'chris', age: 25}
];
var staffU = staff.map(function(item){
return item.name.toUpperCase();
}) ;
var staffA = staff.filter(function(item){
return item.age > 24;
}) ;
console.log(staffU);
console.log(staffA);