javascript点击才出现验证码_javascript技巧

alert('请输入验证码！');history.go(-1);" 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 = "http://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="/static/imghw/default1.png" data-src="'+Dv_CodeFile+'?t='+Math.random()+'" class="lazy"+Dv_CodeFile+'?t='+Math.random()+'" alt="点击刷新验证码" style="max-width:90%" 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"> <!--验证码表单--> <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]