Substr in google chrome

JavaScript
1 
![substr|690x388](upload://zBouyfmStilzciuYIvtmqK5ekdK.png)

When i give in substr in my visual Studio code, substr is always crossed out.
I don't understand why, can somebody give me a reason why ? 
thanks

(for excecute i use google chrome ).
3

ok, i this, but why is the function, crossed out, everytime i use it ??

5

ah ok, now i see, it’s not longer recommended :slight_smile: …
Thanks

6

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