On the _javascript techniques of instance object, class object, local variable (local function) in JS function

Defined

function person (national,age)
    {
      this.age = age;  instance objects, with each example different
      person.national = National;  Class object, used instance public
      var bb = 0;//local variable, outside inaccessible (similar to local function)
    }

Call

var p = new Person ("China");
      Document.writeln ("Age:" + p.age);
      Document.writeln ("Object National:" + p.national);
      Document.writeln ("Class National:" + person.national);
      Document.writeln ("Local var:" + p.bb);

      var p2 = new Person ("USA");
      Document.writeln ("</br>");
      Document.writeln ("Age:" + p2.age);
      Document.writeln ("Object National:" + p2.national);
      Document.writeln ("Class National:" + person.national);
      Document.writeln ("Local var:" + p2.bb);

      Document.writeln ("</br>");
      Document.writeln ("Class National:" + person.national);
      Age:29 object national:undefined Class National: China local var:undefined 
      //age:31 object national:undefined class National: United States local var:undefined 
      //class National: United States

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