Simple explanation between classes, prototypes and properties in javascript

hierarchy.js

//Class
function MyClass() {
    this.ownMember = 123;
}

//Prototype declaration
MyClass.prototype = {
    prototypeMember: 456
};

//Instantiation
var myObject = new MyClass();

//Instance has an own member 'ownMember'
myObject.hasOwnProperty('ownMember') === true;
myObject.ownMember;

//However the instance doesn't have the own member 'prototypeMember'
myObject.hasOwnProperty('prototypeMember') === false;
myObject.prototypeMember;

//The function MyClass may have another properties
MyClass.staticMember = 789;

//However the instance won't have this property
myObject.staticMember === undefined;

//In order to create a proper inheritance, sub class can call the parent constructor 
function MySubClass () {
    MyClass.apply(this, arguments);
}
//And should receive the prototype as well
MySubClass.prototype = new MyClass();

//However the subclass, still doesn't have a reference to 'staticMember' property
MySubClass.staticMember === undefined;