here an example

Question

function student(name,age,classRoom)
{ this.name=name;
this.age=age;
this.classR=classRoom;
}
var st1Obj=new student("abdullah",47,"ClassA");
var st2Obj=new student("Abdulaziz",19,"ClassB");
document.write("Name: ",st1Obj.name,", Age: ",st1Obj.age,", Class room: ",st1Obj.classR,"<br/>");
document.write("Name: ",st2Obj.name,", Age: ",st2Obj.age,", Class room: ",st2Obj.classR,"<br/>");

Answer 1

Here's the output
Name: abdullah, Age: 47, Class room: ClassA
Name: Abdulaziz, Age: 19, Class room: ClassB

Answer 2

Thank you
شكرا shokrn