javascript点击才出现验证码

<% 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:引入外部Js需再刷新一下页面才能执行]

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javascript点击才出现验证码

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