What do these vb source codes mean?

The code should be understood as follows:

There are three text boxes on the form. Enter the code to be executed in the first text box, enter the code to be returned in the second text box, and then click the button 1.

At this time, execute the program you listed: first, generate a "function" code in the str string as follows:

Function ReturnThis ()

..... this is the content of Text 1.

Return this = ... This is the content of Text2.

End function

The next paragraph is the code to execute this function (specifically, it is very complicated, but I will talk about it first).

Such code often makes mistakes, so set the error set (On Error GoTo Err_Exit) first.

), you copied it wrong here and put a colon at the end.

Then create an object, set the language attribute of this pair to vb scripting language, set the code of the object, execute the object and write the result into text3, and release the object.

The following is the handling of the above errors. The essence is to realize the error code (Sc. Error number), error prompt (Sc. Error deScription) and error location (sc. Error.Line) in the immediate window.

By the way, you have studied deeply and are no longer a novice.