js中的闭包

function test() {
  var name = 'alice';
  return {
    getName : function() {
      console.info(name);
    },
    setName : function(newName) {
      name = newName;
    }
  }
};

var person1 = test();
person1.getName();
person1.setName('tom');
person1.getName();

var person2 = test();
person2.getName();
person2.setName('lily');
person2.getName();



>>>alice
>>>tom
>>>alice
>>>lily