JavaScript defines instances of prototype objects and inherited objects

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Define prototype objects and inherit objects. The sample code is as follows:

Prototype _ object _ inheritance

{

Function Circle (xmemy r)

{

This.x=x

This.y=y

This.r=r

}

Circle.prototype.pi = 3.1415926

Function Circle_circumference ()

{

Return 2*this.pi*this.r

}

Circle.prototype.circumference = Circle_circumference

Var c = new Circle (0.0,0.0,5)

Var p = c.circumference ()

[xss_clean] ("the perimeter of circle c is Circle (0.0,0.0,5):", p)

[xss_clean] ("inheritance")

Function Circle_area ()

{

Return this.pi*this.r*this.r

}

Circle.prototype.area = Circle_area

Var mji = c.area ()

[xss_clean] ("the area of circle c is:", mji)

[xss_clean] ("redefinition: do not inherit Circle (0.0,0.0,10);")

Var C3 = new Circle (0.0,0.0,10)

Function area ()

{

Return 3*this.pi*this.r*this.r

}

C3.area = area

P = C3.circumference ()

Mji = C3.area ()

[xss_clean] ("the circumference of the C3 circle is:", p)

[xss_clean] ("the area of C3 circle is:", mji)

}

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