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What's the difference between Array(1) and new Array(1) in JavaScript?

In javascript, how are these two different?

var arr = Array();  
var arr2 = new Array();

If they are the same according to JS standards, are there any browsers that treat both ways differently?

Answer 1

According to ECMA-262 edition 5.1:

15.4.1 The Array Constructor Called as a Function

When Array is called as a function rather than as a constructor,
it creates and initialises a new Array object.
Thus the function call Array(...) is equivalent to the object creation
expression new Array(...) with the same arguments.

The section 11.1.4 (it is quite long, so I won’t quote it) also states that array literal directly corresponds to the new Array(...) constructor call.