会员登陆时的随机验证码怎么实现？

2006-06-13 04:30:47 454 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

使用openResty搭建nginx分发层遇到set_keepalive报错问题解决使用openResty搭建nginx分发层遇到set_keepalive报错问题解决 |[error] 24164#0: *462 lua entry thread aborted: runtime error: /usr/hello/lualib/resty/http.lua:909: bad argument #2 to ‘set_keepalive’ (number expected, go... 阅读详情

asp中，注册成为会员后，登陆时下边加一个随机验证码，怎么实现？
谢谢！在线等！！！
急呀！

...全文

STM32 FatFS文件系统实战：数据安全、性能优化与多任务访问文件系统是嵌入式设备实现数据持久化存储的核心组件，它通过组织和管理存储介质上的数据，为应用程序提供统一的文件访问接口。其基本原理包括文件分配表（FAT）结构、目录项管理和扇区读写操作。在嵌入式领域，一个可靠的文件系统能确保关键数据在异常断电等场景下的完整性，这对于工业控制、数据记录等应用至关重要。FatFS作为一款专为小型系统设计的开源文件系统，因其轻量、可裁剪的特性，被广泛应用于STM32等MCU平台。本文聚焦于FatFS在工程实践中的高级应用，深入探讨如何通过正确使用 `f_sync` 与 `f_clo 阅读详情

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afflatus80 2006-11-09

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有现存的

pzhuyy 2006-11-09

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Google/Csdn之..

超级大笨狼 2006-11-09

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<SCRIPT LANGUAGE=vbscript >
'洗牌
Dim N,S,D,P
P=54'牌的数量
Set D = CreateObject("Scripting.Dictionary")
do while D.Count<P
Randomize
N=Int(P * Rnd + 1)
if not D.Exists(cstr(N)) then
D.Add cstr(N),cstr(N)
end if
loop
for each K in D.Keys
S=S & K & " "
next
msgbox replace(trim(S)," ",",")
</SCRIPT>

access
select top 5 * from [table] order by rnd(id)

sql server
select top 5 * from [table] order by newid()

lovelium 2006-08-01

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兄弟,我发一下.随机图片的.好好看看.有用得!我也是在网上找了.谢谢那位大哥.我只是小改了一下.你也看看吧!

wenlijiao8 2006-08-01

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www.Google.com
asp+随机验证码

lovelium 2006-08-01

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<%
Option Explicit ' 显示声明

Class Com_GifCode_Class
'''''''''''''''''''''''''''''''''''''''''''''
' Author: Layen support@ssaw.net 84815733(QQ)
' Thanks: Laomi, Laomiao, NetRube
' 2006-01-02
'''''''''''''''''''''''''''''''''''''''''''''
Public Noisy, Count, Width, Height, Angle, Offset, Border

Private Graph(), Margin(3)

Private Sub Class_Initialize()
Randomize
Noisy = 16 ' 干扰点出现的概率
Count = 4 ' 字符数量
Width = 80 ' 图片宽度
Height = 20 ' 图片高度
Angle = 2 ' 角度随机变化量
Offset = 10 ' 偏移随机变化量
Border = 1 ' 边框大小
End Sub

Public Function Create()

Const cCharSet = "123456789"

Dim i, x, y

Dim vValidCode : vValidCode = ""
Dim vIndex

ReDim Graph(Width-1, Height-1)

For i = 0 To Count - 1
vIndex = Int(Rnd * Len(cCharSet))
vValidCode = vValidCode + Mid(cCharSet, vIndex+1 , 1)
SetDraw vIndex, i
Next

Create = vValidCode

End Function

Sub SetDot(pX, pY)
If pX * (Width-pX-1) >= 0 And pY * (Height-pY-1) >= 0 Then
Graph(pX, pY) = 1
End If
End Sub

Public Sub SetDraw(pIndex, pNumber)

' 字符数据
Dim DotData(8)
DotData(0) = Array(30, 15, 50, 1, 50, 100)
DotData(1) = Array(1 ,34 ,30 ,1 ,71, 1, 100, 34, 1, 100, 93, 100, 100, 86)
DotData(2) = Array(1, 1, 100, 1, 42, 42, 100, 70, 50, 100, 1, 70)
DotData(3) = Array(100, 73, 6, 73, 75, 6, 75, 100)
DotData(4) = Array(100, 1, 1, 1, 1, 50, 50, 35, 100, 55, 100, 80, 50, 100, 1, 95)
DotData(5) = Array(100, 20, 70, 1, 20, 1, 1, 30, 1, 80, 30, 100, 70, 100, 100, 80, 100, 60, 70, 50, 30, 50, 1, 60)
DotData(6) = Array(6, 26, 6, 6, 100, 6, 53, 100)
DotData(7) = Array(100, 30, 100, 20, 70, 1, 30, 1, 1, 20, 1, 30, 100, 70, 100, 80, 70, 100, 30, 100, 1, 80, 1, 70, 100, 30)
DotData(8) = Array(1, 80, 30, 100, 80, 100, 100, 70, 100, 20, 70, 1, 30, 1, 1, 20, 1, 40, 30, 50, 70, 50, 100, 40)

Dim vExtent : vExtent = Width / Count
Margin(0) = Border + vExtent * (Rnd * Offset) / 100 + Margin(1)
Margin(1) = vExtent * (pNumber + 1) - Border - vExtent * (Rnd * Offset) / 100
Margin(2) = Border + Height * (Rnd * Offset) / 100
Margin(3) = Height - Border - Height * (Rnd * Offset) / 100

Dim vStartX, vEndX, vStartY, vEndY
Dim vWidth, vHeight, vDX, vDY, vDeltaT

Dim vAngle, vLength

vWidth = Int(Margin(1) - Margin(0))

vHeight = Int(Margin(3) - Margin(2))

' 起始坐标
vStartX = Int((DotData(pIndex)(0)-1) * vWidth / 100)

vStartY = Int((DotData(pIndex)(1)-1) * vHeight / 100)

Dim i, j
For i = 1 To UBound(DotData(pIndex), 1)/2

If DotData(pIndex)(2*i-2) <> 0 And DotData(pIndex)(2*i) <> 0 Then

' 终点坐标
vEndX = (DotData(pIndex)(2*i)-1) * vWidth / 100

vEndY = (DotData(pIndex)(2*i+1)-1) * vHeight / 100

' 横向差距
vDX = vEndX - vStartX
' 纵向差距
vDY = vEndY - vStartY

' 倾斜角度
If vDX = 0 Then
vAngle = Sgn(vDY) * 3.14/2
Else
vAngle = Atn(vDY / vDX)
End If

' 两坐标距离
If Sin(vAngle) = 0 Then
vLength = vDX
Else
vLength = vDY / Sin(vAngle)
End If

' 随机转动角度
vAngle = vAngle + (Rnd - 0.5) * 2 * Angle * 3.14 * 2 / 100

vDX = Int(Cos(vAngle) * vLength)

vDY = Int(Sin(vAngle) * vLength)

If Abs(vDX) > Abs(vDY) Then vDeltaT = Abs(vDX) Else vDeltaT = Abs(vDY)

For j = 1 To vDeltaT
SetDot Margin(0) + vStartX + j * vDX / vDeltaT, Margin(2) + vStartY + j * vDY / vDeltaT
Next

vStartX = vStartX + vDX

vStartY = vStartY + vDY
End If
Next
End Sub

Public Sub Output()

Response.Expires = -9999
Response.AddHeader "pragma", "no-cache"
Response.AddHeader "cache-ctrol", "no-cache"
Response.ContentType = "image/gif"

' 文件类型
Response.BinaryWrite ChrB(Asc("G")) & ChrB(Asc("I")) & ChrB(Asc("F"))
' 版本信息
Response.BinaryWrite ChrB(Asc("8")) & ChrB(Asc("9")) & ChrB(Asc("a"))
' 逻辑屏幕宽度
Response.BinaryWrite ChrB(Width Mod 256) & ChrB((Width \ 256) Mod 256)
' 逻辑屏幕高度
Response.BinaryWrite ChrB(Height Mod 256) & ChrB((Height \ 256) Mod 256)

Response.BinaryWrite ChrB(128) & ChrB(0) & ChrB(0)
' 全局颜色列表
Response.BinaryWrite ChrB(255) & ChrB(255) & ChrB(255)

Response.BinaryWrite ChrB(0) & ChrB(85) & ChrB(255)

' 图象标识符
Response.BinaryWrite ChrB(Asc(","))

Response.BinaryWrite ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0)
' 图象宽度
Response.BinaryWrite ChrB(Width Mod 256) & ChrB((Width \ 256) Mod 256)
' 图象高度
Response.BinaryWrite ChrB(Height Mod 256) & ChrB((Height \ 256) Mod 256)

Response.BinaryWrite ChrB(0) & ChrB(7) & ChrB(255)

Dim x, y, i : i = 0
For y = 0 To Height - 1
For x = 0 To Width - 1
If Rnd < Noisy / 100 Then
Response.BinaryWrite ChrB(1-Graph(x, y))
Else
If x * (x-Width) = 0 Or y * (y-Height) = 0 Then
Response.BinaryWrite ChrB(Graph(x, y))
Else
If Graph(x-1, y) = 1 Or Graph(x, y) Or Graph(x, y-1) = 1 Then
Response.BinaryWrite ChrB(1)
Else
Response.BinaryWrite ChrB(0)
End If
End If
End If
If (y * Width + x + 1) Mod 126 = 0 Then
Response.BinaryWrite ChrB(128)
i = i + 1
End If
If (y * Width + x + i + 1) Mod 255 = 0 Then
If (Width * Height - y * Width - x - 1) > 255 Then
Response.BinaryWrite ChrB(255)
Else
Response.BinaryWrite ChrB(Width * Height Mod 255)
End If
End If
Next
Next
Response.BinaryWrite ChrB(128) & ChrB(0) & ChrB(129) & ChrB(0) & ChrB(59)
End Sub
End Class

Dim mCode
Set mCode = New Com_GifCode_Class
Session("GetCode") = mCode.Create()
mCode.Output()
Set mCode = Nothing
%>

netdust 2006-08-01

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http://www.oyj.cn/Article/2/88.htm

loska 2006-06-14

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<%' 好用的话记得结贴给分 %>

loska 2006-06-14

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<%
Dim num1,rndnum
Randomize
Do While Len(rndnum)<4
num1=CStr(Chr((57-48)*rnd+48))
rndnum=rndnum&num1
Loop
session("verifycode")=rndnum
%>
请输入随机验证码 :<%=session("verifycode")%>

liangjianshi 2006-06-14

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www.baidu.com

是是非非 2006-06-14

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Google之

aner 2006-06-14

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网上找一个,大把的

Clove 2006-06-14

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同意楼上,的确很多
可以随机数字调用图片
或者使用数据库保存的图片生成新的图片都可以
你在这个板块搜索一下就很多

liuph3000 2006-06-14

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搜索一下，很多

会员登陆时的随机验证码怎么实现？

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