How to delete strings in html using javascript

Question

so i a making a calculator using html and i have mapped the "delete all numbers on screen" function using javascript ....now i have problem deleting string by string .i.e if i have 12345 shown on the screen, how to delete the 5 in the value.

Answer 1

https://www.w3schools.com/jsref/jsref_substr.asp

Answer 2

thanks bro but will it work for numbers ir i guess i have to convert the str to number first ..thanks again