I'm practicing exception handling for membership registration and I have a question about validation.

While practicing membership, look at the examples and process ID exceptions (only English characters and numbers are allowed) for(var i = 0; i='0' && ch <='9') && !(ch>='a' && ch <='z') && !(ch>='A' && ch <='Z') { alert("ID can be alphabetic, numeric only); return false; } }

I've implemented it.

I'd like to make an exception in the same way as above without using the regular expression method for passwords In addition, I want to make the password in a way that passes only when all three characters are included, but I don't know how to specify the range of special characters.