Different ways of writing javascript function

The examples below are different ways of writing a javascript function. The all have a property name and a method speak.

Regular Function.

function Person (name)
{
	this.name=name;
	this.speak = function()
	{
		console.log("My name is "+name );
	}
}
var p1 = new Person("Anna");
p1.speak();

Variable function.

var Person = function(name)
{
	this.name=name;
	this.speak = function()
	{
		console.log("My name is "+name );
	}	
}
var p2 = new Person("Ben");
p2.speak();

Create an empty function and then assign property and method by using the object’s prototype property.

var Person = function(){};
Person.prototype.name;
Person.prototype.speak = function()
{
	console.log("My name is "+ this.name);
}
var p3 = new Person();
p3.name="Cain";
p3.speak();

Object literal, makes it a singleton object.

var Person = 
{
	name : "Dale",
	speak : function(){console.log("My name is "+this.name);}
}
Person.speak();

Create an object by using the keyword new, makes it a singleton object.

var Person = new function()
{
	this.name = "Ean";
	this.speak = function(){console.log("My name is "+this.name);}
}
Person.speak();