javascript组合模式创建对象

<script>

function Person(name, age) {
this.name = name;
this.age = age;
this.family = ["father" , "mather" , "sister"] ;
}

Person.prototype = {
constructor: Person,
say : function () {
return "name : " + this.name + "age: " + this.age;
}
} ;

var p1 = new Person("zhangsan", 19);
console.log(p1.family);
p1.family.push("brother") ;
console.log(p1.family) ;
var p2 = new Person("lisi" , 20) ;
console.log(p2.family) ;

</script>

["father", "mather", "sister"]
["father", "mather", "sister", "brother"]
["father", "mather", "sister"]