create a “constructor method”-----javascript

<script type="text/ecmascript">
        function construct(name, val) {
            this[name] = val;
        }

        function student(name, age, grade, father, mother) {
            this.constructor = construct;
            this.name = name,
            this.age = age;
            this.grade = grade;
            this.parents = new parents(father, mother);

        }

        function parents(father, mother) {
            this.father = father;
            this.mother = mother;
        }
        var student1 = new student("Joe", 16, 85, "Mark", "Stacy");
        student1.constructor("boyfriend", "Tom");
    </script>

 

the rusult of student1

 

student1
{}
    age: 16
    boyfriend: "Tom"
    grade: 85
    name: "Joe"
    parents: {}