Bad inheritance call position

[ghost]

inheritance is called on bad position.

php:
class A{
public function foo(){echo('A')}
}
class B extends A{
public function foo(){echo('B')}
}
$test = new B();
$test->foo(); //echo 'B'

JS:
function A(){
this.foo = function (){alert(('A')};
}
function B() {
this.foo = function (){alert( ('B')};
A.call(this); //foo is override by parent class. must be on beginning of class
}
var test = new B());
test.foo());//alert 'A'