PHP+javascript制作带提示的验证码源码分享

2024-05-04 22:21:01

字体：大中小

来源：转载

供稿：网友

html代码：

代码如下:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>简单验证码</title>
</head>
<script language="javascript" src="js/checked.js"></script>
<body>
<form id="register" name="register" method="post" >
<table align="center">
    <tr>
      <td ><div align="right">验证码：</div></td>
      <td ><input id="yzm" type="text" name="yzm" size="8" onBlur="javascript:chkyzm(form)" onMouseOver="this.style.backgroundColor='#ffffff'" onMouseOut="this.style.backgroundColor='#e8f4ff'"/></td><td>
        <input id="yzm2" type="hidden" value="" /></td>
      <td align="center" valign="middle"><script>yzm()</script></td>
      <td ><a href="javascript:code()" style="text-decoration:none">看不清</a></td>
      <td width="150" align="center"><div id="yzm1"><font color="#999999">请输入验证码</font></div></td>
    </tr>
</table>
</form>
</body>
</html>

JS代码：

代码如下:
function chkyzm(form){     //对验证码进行验证
if(form.yzm.value==""){
  yzm1.innerHTML="<font color=#FF0000>×验证码不能为空</font>";
}else if(form.yzm.value!=form.yzm2.value){
  yzm1.innerHTML="<font color=#FF0000>×验证码输入错误</font>";
}else{
  yzm1.innerHTML="<font color=green>√验证码输入正确</font>";
}
}
function yzm(){      //生成验证码
var num1=Math.round(Math.random()*1000000);//随机小数放大
var num=num1.toString().substr(0,4);//取4位整数
var yzm2=document.getElementById("yzm2");
document.write("<img name=codeimg src=yzm.php?num="+num+"'>");
yzm2.value=num;
}
function code(){      //重置验证码
var num1=Math.round(Math.random()*1000000);
var num=num1.toString().substr(0,4);
var yzm2=document.getElementById("yzm2");
document.codeimg.src="yzm.php?num="+num;
yzm2.value=num;
}