A brief discussion on the implementation of numeric and character mixed verification code in ASP

A brief discussion on the implementation of numeric and character mixed verification code in ASP

First generate a 4-digit random code

ychar=0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,i,j,k,l,m,n, o,p,q,r,s,t,u,v,w,x,y,z

yc=split(ychar,,)

ynum=4'The number of random code numbers here can be changed

for i=1 to ynum

Randomize

ycode=ycode&yc(Int((35*Rnd)))

next

'Display the random code to a specific position, then use a hidden text box in the form to set the initial value to the random code

Then obtain the user's username, password, and filled in random code. As for the verification of the username and password, you can handle it yourself. If the obtained random code is inconsistent with the random code in the hidden box, an error will be reported.