var?person?=?{};
Object.defineProperties(person,{
??title?:?{value?:?'fe'},
??crop?:?{value?:?'BABA'},
??salary?:?{value?:?5000},
??luck?:?{
????get?:?function?()?{
??????return?Math.random()?>?0.5???'good'?:?'bad';
????}
??},
??promote?:?{
????set?:?function(level)?{
??????this.salary?*=?level;
????}
??}
});

//?var?obj?=?Object.getOwnPropertyDescriptor(person,'luck');
//?console.log(obj);
//?console.log(person.salary);
person.promote?=?2;
console.log(person.salary)