js对象的getter和setter

 1 var person = {
 2     _country: "中国",
 3     set country(country_name) {
 4         console.log("设置属性值时可以做一些操作");
 5         this._country = country_name;
 6     },
 7     get country() {
 8         console.log("获取属性值时可以做一些操作");
 9         return this._country;
10     }
11 };
12 
13 person.country;
14 console.log(person);
15 person.country = "英国"
16 person.country;
17 console.log(person);