After encountering this question, I did not find the answer for a long time. Later I used the omnipotent Google, and it seems that I did not find the answer.
Detailed description:
You can use $ (". Select") to select a jqeury object. No problem.
No problem with $ (". Select"). Find (". CCC ")
By $ (". select "). find (". CCC Div ") or $ (" select "). find ("Div. CCC ") The problem arises. You cannot find target through find.
The domestic search engine did not find the relevant solution, but had to try Google. Good luck, Google is really open.
However, no solution was found.
I read the feedback from others on this error in jquery, as shown below:
<!DOCTYPE html>
Some commonalities are found: Extend your methods on the object prototype.
I tried to extend and delete the objects in my code.
In fact, there is no need to expand and there is no problem, it can be replaced by the global method or factory method.
Typeerror: matchexpr1_type.exe C is not a function