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PHP JavaScript table file verification failed, and the form is still submitted

Source: Internet
Author: User
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If the PHP JavaScript form verification fails and the form is still submitted as a question, I do not enter any data. click submit for registration and a prompt such as "Enter user name" will pop up, click "OK" to go to another page and display only one sentence: Column 'username' cannotbenull. The following PHP javascript form verification fails and the form is still submitted
For example, if I do not enter any data, click submit for registration. a prompt such as "Enter user name" will pop up. Click OK to go to another page, only one sentence is displayed: Column 'username' cannot be null.
The following code is used:
HTML code 
  
  
  
  Untitled Document
  
  
  Forum registration
      Please fill in the following required information to complete registration. * All required items are required.Clear Cookies. contact us for no-picture mobile browsing back to top
Time now is: 06-21, Gzip enabled Zhe B2-20070029
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