javascript create function

Question

What is the difference between this:

var doSomething=function()
{
    //do blah blah blah...  
}

And this:

function doSomething()
{
    //do blah blah blah...  
}

Another question: In PHP, we create a function by doing this:

function doSomething(a,b)
{
    //do something to variable a and b...
}

In JavaScript, we may have an object before the function:

object.doSomething(a);

My second question is, how would you create a function which requires an object in JavaScript?

Answer 1

The number one Google result for "function statement vs expression javascript" is another Stack Overflow question:

What is the difference between a function expression vs declaration in JavaScript?

It references the following article, which is the definitive reference on the subject:

http://kangax.github.com/nfe/