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X-position of the mouse cursor
Y-position of the mouse cursor
Y-position of the mouse cursor
Testcursor
caretPos
Attachment:===
Asked by Norton Alex
at 2025-02-01 21:15:33
ModifyPoint:500 Replies:2 POST_ID:829294USER_ID:12423
Topic:
javascript
I have seen a lot javascript file whcih starting with "!" character before function
What is the purpose of that ?
For example;
!function(x){a=x}()
Please advise
Accepted Solution
Expert: Wilson Edwards replied at 2025-02-01 21:21:10
500 points Excellent
Reference:
Expert: Wilson Edwards replied at 2025-02-01 21:19:31
! is the boolean not operator, which you probably know. Calling a function results in a value (in this case undefined). The side effect still happens, so a will be assigned 7, but then nothing happens. You can rewrite it like this:a = x;!undefined!undefined is true, but since it isn't used at all, it won't matter.
