JavaScript form verification example-verification form item blank _ javascript tips

Form verification is essential for almost every website that needs to be registered or logged on. The following article describes whether the verification form item of the JavaScript form verification instance is empty, when it comes to js form verification instances, you need to learn about js form verification instance code. form verification is essential for almost every website that requires registration or login, some verifications are very complex and may be described as various requirements for you. However, this section only describes the simplest verification method in the form, that is, to determine whether it is null, some websites with low requirements have already met their needs.

The code is as follows:

   
  
  JavaScript simple form verification