JS get and set use examples

Clever use of get and set, can directly manipulate object properties to achieve read and write, can greatly improve the programming efficiency, give a typical example:

 
var test = { 
_Name : null, 
_Age : 0, 

//_Name read and write
set name(name) {this._Name = name;}, 
get name() {return this._Name;}, 
//_Age read and write
set age(age) {this._Age = age;}, 
get age() {return this._Age;} 
} 

alert(test.name + " " + test.age);//bull 0 
test.name = 'lucy'; 
test.age = 20; 
alert(test.name + " " + test.age);//lucy 20