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蓝森林 http://www.lslnet.com 2006年8月25日 8:28
 JavaScript实现表单输入验证码之问题请教
本人学着写了一个JavaScript实现表单输入验证码，我一朋友说要是用户输入验证码错误后，验证码能自动更新一个就好了，可是想了好久也没有实现，请大虾出手相助，在此谢谢了
http://www.olay.xinwen365.net/check.htm
查看此网页 |
| 这种验证码几乎没意义 |
JavaScript实现表单输入验证码之问题请教
对不起大家了，上面的那个链接不能用了，我还是把脚本代码粘上吧 ：
<script language="JavaScript">
// code_length设置验证码的位数
function ger_code(code_length) {
var rand_aa="";
var code=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","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","!","@","#","$","%","&","*","(",")","-","_","|","?","/");
var code_Num=code.length; //数组长度
for(i=0;i<code_length;i++)
{
var ran_ss=parseInt(Math.random()*code_Num);
rand_aa+=String(code[ran_ss]);
}
document.write(" 验证码 <input type=text name=check_code size="+code_length+" value="+rand_aa+" class=blank_bg maxsize=5 readonly=true>");
}
</script>
<form name=log action="" method="post" onSubmit="return check_form()">
<table width="400" height="112" border="1" align="center" bordercolor="#CCCCCC">
<tr>
<td colspan="3"><div align="center"><b>用户登录</b></div></td>
</tr>
<tr>
<td width="86"><div align="right">用户名</div></td>
<td colspan="2"><input name=uname type="text" size="22" /></td>
</tr>
<tr>
<td><div align="right">密码</div></td>
<td colspan="2"><input name=pwd type="password" size="22" /></td>
</tr>
<tr>
<td><div align="right">输入验证码</div></td>
<td width="154"><input name=check_str type="text" size="22" /></td>
<td width="138"><script language="JavaScript">ger_code(5); //设置验证码的位数</script></td>
</tr>
<tr>
<td colspan="3"><div align="center">
<table width="35%" border="0">
<tr>
<td><div align="center"><input type=submit value=提交 /></div></td>
<td><div align="center"><input type=reset value=重置 /></div></td>
</tr>
</table>
</div></td>
</tr>
</table>
</form>
<script language="JavaScript">
function check_form(){
if(log.uname.value=="")
{
alert("用户名不能为空!");
log.uname.focus()
return false;
}
if(log.pwd.value=="")
{
alert("密码不能为空!");
log.pwd.focus()
return false;
}
if(log.check_str.value=="")
{
alert("验证码不能为空!");
log.check_str.focus();
return false;
}
if(log.check_str.value!=log.check_code.value)
{
alert("输入验证码错误!");
log.check_str.focus();
return false;
}
return true();
}
</script>
<style type=text/css>
.blank_bg {
background-color:#000000;
color:#FFFFFF;
border-width:0px;
}
</style> |
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