Introduction to JavaScript regular expressions starting with a letter

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Form Verification: Create a form and use JavaScript dom to add verification to the form.

Requirements:

• Verify the user name, which must start with a letter and be between 2-6 characters in length.
• The verification password cannot be empty.
• The confirmation password cannot be empty and must be consistent with the password.
  
  
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新用户注册
 
 
 
 
 
 用户名称: 
 
   
 
 
 
 密  码: 
 
   
 
 
 
 确认密码: 
 
   
 
 
 
 
 

Copy after login

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