JavaScript tips (2): Form Submission Validation class

Javascript| Form Submission | tips

1 form items cannot be empty

2 Compare the values of two table items

3 form items can only be numbers and "_" for phone/bank account verification, can be extended to domain name registration, etc.

4 table Single input value/length limit

Chinese/English/digital/email address legality judgment

Qualifying the characters that a form item cannot enter