The pros and cons of JavaScript to create closures and the difference analysis _javascript skills

Usually javascript creates closures in two different ways.

Constructor method:

New function () { 
var variable ... 
} 

Inline execution Mode:

(function () { 
var variable ... 
}) (); 

What's the difference between JavaScript's internal operating mechanism? Which way to create it better? What is the advantage of it compared to closures created in other ways?

That's how I understand it:

Difference:

First: A child method can share a variable
Second: Internal child method Share variable

Comparison:

I think the inner Union is better;

Advantage:

The general inline creation is to request memory on demand, because only locally executed variables in memory, you can organize related and dependent code to minimize the risk of accidental interaction, construct all of the method execution variables to be stored in memory, which will affect the performance of the Web page, and recommend that you delete the variable before exiting

Of course, this is only my personal understanding, in fact, generally used closures need to be particularly in the IE kernel browser generated memory leaks, preferably after the use of variables to kill.

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