Javascript design pattern-Input Validation for rule pattern _ javascript skills

In rule mode, a policy is an algorithm or business rule that encapsulates these policies as functions and provides unified invocation, this article introduces the javascript design pattern-the input verification of the Rule pattern. If you need a friend, refer to the rule pattern to define the algorithm family and encapsulate them separately so that they can replace each other, this mode makes algorithm changes independent of customers who use computing rice.

First define a simple input form:

      
             
      
        
User name:
        
      
      
        
Password:
        
      
      
        
Confirm Password:
        
      
      
        
Email:
        
      
    
    
    Submit