var test = {
_Name : null,
_Age : 0,
// Read and write of_Name
set name(name) {this._Name = name;},
get name() {return this._Name;},
// Read and write of_Age
set age(age) {this._Age = age;},
get age() {return this._Age;}
}
alert( + " " + );//bull 0
= 'lucy';
= 20;
alert( + " " + );//lucy 20