var person ={ _name : "chen", age:21, set name(name) {this._name = name;},get name() {return this._name;}}
console.log(person.name)
輸出”chen“
person.name="lunc";
輸出"lunc"
person.name
輸出"lunc"

例子2：

var p = {
    name:"chen",
    work:function() {
        console.log("wording...");
    },
    _age:18,
    get age(){
        return this._age;
    },
    set age(val) {
        if (val<0 || val> 100) {//如果年齡大於100就丟擲錯誤
throw new Error("invalid value")
        }else{
            this._age = val;
        }
    }
};
console
 
.log(p.name);//輸出chen

瀏覽器呼叫結果：
p.age

"18"

p.age=23

"23"

p.age=200

Uncaught Error:invalid value