javascript验证码
<script language="javascript" type="text/javascript">
![](/Images/OutliningIndicators/None.gif)
var code ; //在全局 定义验证码
function createCode()
![](/Images/OutliningIndicators/ExpandedBlockStart.gif)
{
code = "";
var codeLength = 6;//验证码的长度
var checkCode = document.getElementById("checkCode");
var selectChar = new Array(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');//所有候选组成验证码的字符,当然也可以用中文的
for(var i=0;i<codeLength;i++)
![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
var charIndex = Math.floor(Math.random()*36);
code +=selectChar[charIndex];
}
// alert(code);
if(checkCode)
![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
checkCode.className="code";
checkCode.value = code;
}
}
![](/Images/OutliningIndicators/None.gif)
<script>
![](/Images/OutliningIndicators/None.gif)
<asp:TextBox ID="test" runat="server" onclick="createCode();"></asp:TextBox>
![](/Images/OutliningIndicators/None.gif)
<asp:Label ID="checkCode" runat="server"></asp:Label>
![](/Images/OutliningIndicators/None.gif)
原文地址:https://www.cnblogs.com/jinweida/p/1237342.html