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the difference between the two  function of Javascript
We all know that there are two kinds of Javascript Function definition of the method is very common. For example,

function a () (alert ( "a"))
var a = function () (alert ( "a"))

Although the two kinds defined by the function called when the results of the same, but there is still difference between the middle. Cite a simple example, if we are to re-definition of a (), but the new method should inherit a () inside and all other methods of expansion. This can clearly see the difference between the two methods.

1. First of all, we first establish a temporary variable to store a ()
    var b = a;

Then, re-definition of a ()
The first method:
function a () (
     b ();
     alert ( "ok");
)

The second approach:
a = function () (
     b ();
     alert ( "ok");
)

It is found that we can try. The first approach to the definition of a () will stack overflow error. The second method is to retain the original success of a () enforced by the script, the success of alert to the "a" "ok" the words that a () method was re-defined.

Here you can clearly distinguish the difference between the two methods. Different definition of the order.
The first one, did not in fact the beginning of a re-definition of the function and inside the implementation of its own.
The second method, a = function () not here to function inside the implementation of a code has been redefined. So here the re-definition is effective.