On IE when Eval encounters function processing _javascript skills

There is no function in the 1:eval, direct execution:
Eval ("Alert (' SS ');"); /all browsers are output correctly
The situation in 2:eval has function,function immediate execution:
Eval (function () {alert (' SS ');}) ();");/ /all browsers correct output
There is a function in the 3:eval, a function reference is saved using a variable, and the function is invoked:
var f=eval ("(function () {alert (' SS ');}");
f ();//ie error: Missing object other browser normal
When the eval defines a function and returns it to the variable, ie complains: missing object. It can be seen that the function defined in the eval under IE does not return to the eval outside successfully.

WORKAROUND: Make the function object return as a result of execution:

Method 1:

var f=eval (() (function () {return function () {alert (' SS ');}}) ()");
f ();//all browsers correct output
Eval calls an immediately executing function that returns a function object after it executes, at which point the reference to that function object is successfully returned to the external variable.

Method 2:

var f=eval ("(false| | function () {alert (' SS ');});
f ();//all browsers successfully output
This method is also the method used in jquery, function as the result of the execution of the expression or return, the same can successfully solve the problem. Of course, the expression is not limited to the above false| | function () {}, which resolves the problem if a function is returned successfully by a variety of expressions:

/* and expression: */
var f=eval ("(True&&function () {alert (' SS ');}");
f ();//all browsers normal output

/* Ternary expression: * *
var f=eval ("(True?function () {alert (' SS ');}: ');");
f ();//all browsers normal output