JS Object Private Variable public variable problem

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JS Object Private Variable public variable problem 5Little Brother Beginner JS Object-oriented Programming existing problem ask you prawns:
Person=function () {
Private variable definition
var name;
VAE age;
var alert=function () {Alert (name+age);};

return {
Printname:function () {alert (this. Alert ());},
Printage:function () {alert (thia.age);}
}
}

External call person person1=new person ();
Person1.name= "Zhang San";
person1.age=20;
Person1.printage ();//Success without errors
Person1.printname ();//Error

Would you please point out why private variables can be adjusted with this in public methods, and the private methods are all wrong?

Supplementary questions:Langshao writes JavaScript code

2. function WhoAmI () //define a WhoAmI
4. {
6. Alert ("I ' m" + THIS.name + "of" + typeof (this));
8. };
10. WhoAmI ();  //This is the current global object of this code, which in the browser is the window object whose Name property is an empty string.
12. Output: I ' m of object
14. var billgates = {name: "Bill Gates"};
16. Billgates.whoami = WhoAmI;  //WhoAmI function as a method of billgates.
18. Billgates.whoami (); //This is the billgates. Output: I ' m Bill Gates of Object
20. var stevejobs = {name: "Steve Jobs"};
22. Stevejobs.whoami = WhoAmI;  //WhoAmI function as a method of stevejobs.
24. Stevejobs.whoami (); //This is the stevejobs. Output: I ' m Steve Jobs of Object
26. Whoami.call (billgates); //Direct billgates as this, call WhoAmI. Output: I ' m Bill Gates of Object
28. Whoami.call (Stevejobs); //Direct stevejobs as this, call WhoAmI. Output: I ' m Steve Jobs of Object
30. 8
32. BillGates.WhoAmI.call (Stevejobs); //Use stevejobs as this, but call BillGates's WhoAmI method. Output:
34. I ' m Steve Jobs of Object
36. SteveJobs.WhoAmI.call (billgates); //Use billgates as this, but call Stevejobs's WhoAmI method. Output:
38. I ' m Bill Gates of Object
40. Whoami.whoami = WhoAmI;  //Set the WhoAmI function to its own method.
42. Whoami.name = "WhoAmI";
44. Whoami.whoami (); //This is the WhoAmI function itself. Output: I ' m WhoAmI of function
46. ({name: "Nobody", Whoami:whoami}). WhoAmI (); //Temporarily create an anonymous object and set the property after calling WhoAmI
48. Method. Output: I ' m Nobody of object

Thank you for your very detailed reply. Do you have QQ? Can you add it and ask for your advice later?Javascript February 06, 2010 23:12 Wanghuidong
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Adoption of the answer to the JavaScript code

2. function WhoAmI () //define a WhoAmI
4. {
6. Alert ("I ' m" + THIS.name + "of" + typeof (this));
8. };
10. WhoAmI ();  //This is the current global object of this code, which in the browser is the window object whose Name property is an empty string.
12. Output: I ' m of object
14. var billgates = {name: "Bill Gates"};
16. Billgates.whoami = WhoAmI;  //WhoAmI function as a method of billgates.
18. Billgates.whoami (); //This is the billgates. Output: I ' m Bill Gates of Object
20. var stevejobs = {name: "Steve Jobs"};
22. Stevejobs.whoami = WhoAmI;  //WhoAmI function as a method of stevejobs.
24. Stevejobs.whoami (); //This is the stevejobs. Output: I ' m Steve Jobs of Object
26. Whoami.call (billgates); //Direct billgates as this, call WhoAmI. Output: I ' m Bill Gates of Object
28. Whoami.call (Stevejobs); //Direct stevejobs as this, call WhoAmI. Output: I ' m Steve Jobs of Object
30. 8
32. BillGates.WhoAmI.call (Stevejobs); //Use stevejobs as this, but call BillGates's WhoAmI method. Output:
34. I ' m Steve Jobs of Object
36. SteveJobs.WhoAmI.call (billgates); //Use billgates as this, but call Stevejobs's WhoAmI method. Output:
38. I ' m Bill Gates of Object
40. Whoami.whoami = WhoAmI;  //Set the WhoAmI function to its own method.
42. Whoami.name = "WhoAmI";
44. Whoami.whoami (); //This is the WhoAmI function itself. Output: I ' m WhoAmI of function
46. ({name: "Nobody", Whoami:whoami}). WhoAmI (); //Temporarily create an anonymous object and set the property after calling WhoAmI
48. Method. Output: I ' m Nobody of object

February 07, 2010 10:22 Langshao
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JavaScript code

2. Person = function () {
4. return {
6. Printname: function () {this . Alert.call (this);},
8. Printage: function () {alert (this.age);}
10. }
12. }
14. function process () {
16. //External call
18. Person1 = new Person ();
20. Person1.name="Zhang San";
22. person1.age=20;
24. Person1.  Alert = function () {alert (THIS.name + this.age);};
26. Person1.printage ();
28. Person1.printname ();
30. }

JS Object Private Variable public variable problem