Question about making a property on custom object

Hello!

I got recently intrigued with JavaScript's prototype-based
object-orientation.
However, I still don't understand the mechanism clearly.

[Q1]
What's the difference between the following two?

(1)
function C(){
this.name = "Unknown"
}

(2)
function C(){
}
C.prototype.name = "Unknown"



[Q2]
There's no notion of Class in JavaScript and everything is an object.
How many objects are created in the following code including the
objects implicitly created in the behind?

function C(){
}

function D(){
}
D.prototype = new C

var obj = new D


[Q3]
I saw some codes like "this.base = SomeClass".
When is it needed?
Is it different from ClassName.prototype = new ParentClassName?


[Q4]
What's the difference between prototype and __proto__?


Thanks in advance.
Sam

.

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