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javascript点击才出现验证码

2008-04-25 15:23:13 作者：

用javascript[js]实现的必须经过点击才能出现严重码效果代码

<% 
if request("cur_action")="add" then 
code=Request.Form("code")  
if code=empty then 
response.write "<script LANGUAGE='javascript'>alert('请输入验证码！');history.go(-1);</script>" 
Session("GetCode")=empty 
response.End() 
elseif lcase(code)<>lcase(Session("GetCode")) then 
response.write "<script LANGUAGE='javascript'>alert('您输入验证码出错！');history.go(-1);</script>" 
Session("GetCode")=empty 
response.End() 
Else 
Response.Write "<script>alert('登陆成功');history.back();</script>"          
response.End() 
end if 
end if 
%> 
<form name="form" method="post" action="index.asp"> 
<SCRIPT LANGUAGE=javascript> 
/*显示认证码 o start1*/ 
function get_Code() { 
        var Dv_CodeFile = "https://www.jb51.net/inc/getcode.asp"; 
//这个地方需要换车你网站实际的地址 
        if(document.getElementById("imgid")) 
                document.getElementById("imgid").innerHTML = '<img src="'+Dv_CodeFile+'?t='+Math.random()+'" alt="点击刷新验证码" style="cursor:pointer;border:0;vertical-align:middle;height:18px;" onclick="this.src=\''+Dv_CodeFile+'?t=\'+Math.random()" />' 
} 
/*o end*/ 
</script> 
<script language="JavaScript" type="text/javascript"> 
var dvajax_request_type = "GET"; 
</script> 
<script language="JavaScript" src="dv_ajax.js" type="text/javascript"></script> 
<tr> 
  <td style="width:100px; text-align:right">验证码：</td> 
  <td style="width:150px; text-align:left"> 
    <p> 
      <input type="text" name="code" id="code" size="4" maxlength="4" tabindex="6" onfocus="get_Code();this.onfocus=null;" onkeyup="dv_ajaxcheck('checke_dvcode','code');" /> 
    <span id="imgid" style="color:red">点击获取验证码</span><span id="isok_code"></span></p> 
    
   <input name="cur_action" type="hidden" value="add"> 
   <input name="提交" type="submit" id="提交"> 
   </td> 
</tr> 
</form>

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]

javascript点击才出现验证码

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