php 不刷新页面，点击刷新验证码

时间：2021-10-19 17:16:05
code.php
<?phpHeader("Content-type: image/gif");/** 初始化*/$border = 0; //是否要边框 1要:0不要$how = 4; //验证码位数$w = $how*15; //图片宽度$h = 20; //图片高度$fontsize = 6; //字体大小$alpha = "abcdefghjkmnpqrstuvwxyz"; //验证码内容1:字母$number = "23456789"; //验证码内容2:数字$randcode = ""; //验证码字符串初始化srand((double)microtime()*1000000); //初始化随机数种子$im = ImageCreate($w, $h); //创建验证图片/** 绘制基本框架*/$bgcolor = ImageColorAllocate($im, 255, 255, 255); //设置背景颜色ImageFill($im, 0, 0, $bgcolor); //填充背景色if($border){    $black = ImageColorAllocate($im, 0, 0, 0); //设置边框颜色    ImageRectangle($im, 0, 0, $w-1, $h-1, $black);//绘制边框}/** 逐位产生随机字符*/for($i=0; $i<$how; $i++){       $alpha_or_number = mt_rand(0, 1); //字母还是数字    $str = $alpha_or_number ? $alpha : $number;    $which = mt_rand(0, strlen($str)-1); //取哪个字符    $code = substr($str, $which, 1); //取字符    $j = !$i ? 4 : $j+15; //绘字符位置    $color3 = ImageColorAllocate($im, mt_rand(0,100), mt_rand(0,100), mt_rand(0,100)); //字符随即颜色    ImageChar($im, $fontsize, $j, 3, $code, $color3); //绘字符    $randcode .= $code; //逐位加入验证码字符串}/** 添加干扰*/for($i=0; $i<10; $i++)//绘背景干扰线{       $color1 = ImageColorAllocate($im, mt_rand(0,255), mt_rand(0,255), mt_rand(0,255)); //干扰线颜色    ImageArc($im, mt_rand(-5,$w), mt_rand(-5,$h), mt_rand(20,300), mt_rand(20,200), 55, 44, $color1); //干扰线}  /*for($i=0; $i<$how*40; $i++)//绘背景干扰点{       $color2 = ImageColorAllocate($im, mt_rand(0,255), mt_rand(0,255), mt_rand(0,255)); //干扰点颜色     ImageSetPixel($im, mt_rand(0,$w), mt_rand(0,$h), $color2); //干扰点}*///把验证码字符串写入sessionsession_start();$_SESSION['randcode'] = $randcode;/*绘图结束*/Imagegif($im);ImageDestroy($im);/*绘图结束*/?>


login.php

<?php 
/* 
* 
* 
*/ 
session_start(); 
if($_POST[sub]){ 
//if(!empty($_POST[gd_pic])){
//判断验证码是否相同 
if($_POST[gd_pic]==$_SESSION[randcode]){ 
echo "验证成功！"; 
}else{ 
echo "验证码错误"; 
} 
} 
?> 
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>验证码测试</title>

<script>  
         function formSubmit(){   
 document.actionForm.action = "login.php";   
             document.actionForm.submit();   
         } 
 </script>
</head>

<body>
<form name="actionForm" action="login.php" method="POST"> 


验证码：<input type="text" name="gd_pic"/><img src="code.php" onClick="this.src='code.php'"/><br> 

<input type="submit" name="sub" value="submit"/> 
<a href="javascript:formSubmit()" name="sub">发布</a>
</form> 
</body>
</html>


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