JavaScript walkthrough (8). Object Member, class member (prototype, non-prototype)

/* Class attributes and Object Attributes */
Array. Info1 = "Info1"; // adds the class attribute Info1 to the Array.
Array. prototype. Info2 = "Info2"; // adds the object attribute Info2 to the Array.

Arr = [1, 2, 3];
Alert (arr. Info1); // undefined
Alert (arr. Info2); // Info2

Alert (Array. Info1); // Info1

/* Class methods and object Methods */
Array. ShowMessage = function () {alert ("ClassMessage ");};
Array. prototype. ShowMessage = function () {alert ("ObjectMessage ");};

Arr = [1, 2, 3];
Arr. ShowMessage (); // ObjectMessage
Array. ShowMessage (); // ClassMessage

From the Delphi blog