JS获取验证码，并验证

来源：互联网发布：linux dd命令编辑：程序博客网时间：2024/05/29 15:19

因为公司项目的需求，学习了几天的JS，现将刚看到的JS获取验证码，并验证的全代码记录下来，方便大家学习！

1.获取本地自制的验证码：

<pre name="code" class="javascript"><html><head><style type="text/css">.code{background-image:url(111.jpg);font-family:Arial;font-style:italic;color:green;border:0;padding:2px 3px;letter-spacing:3px;font-weight:bolder;}.unchanged {border:0;}</style><script language="javascript" type="text/javascript">var code ; //在全局 定义验证码function createCode(){ code = "";var codeLength = 4;//验证码的长度var checkCode = document.getElementById("checkCode");checkCode.value = "";var selectChar = new Array(2,3,4,5,6,7,8,9,'A','B','C','D','E','F','G','H','J','K','L','M','N','P','Q','R','S','T','U','V','W','X','Y','Z');for(var i=0;i<codeLength;i++) {   var charIndex = Math.floor(Math.random()*32);   code +=selectChar[charIndex];}if(code.length != codeLength){   createCode();}checkCode.value = code;}function validate () {var inputCode = document.getElementById("input1").value.toUpperCase();if(inputCode.length <=0) {   alert("请输入验证码！");   return false;}else if(inputCode != code ){   alert("验证码输入错误！");   createCode();   return false;}else {   alert("OK");   return true;}}</script></head><body onload="createCode();"><input type="text" id="input1" /><input type="text" id="checkCode" class="code" style="width: 55px" /> <a href="#" onclick="createCode()">看不清楚</a><br /><br /><center><input id="Button1" onclick="validate();" type="button" value="确定" /></center><script></script></body></html>

2.获取网络验证码：

<html><head><script>function myFunction(){var element = document.getElementById("img_captcha");var link = element.src ;link = link.split("?")[0];element.src=link+'?'+(new Date()).getTime();}</script><head><body><form class="login" method="post" action="login" id="login-form">   <p><span class="input-bg"><input type="text" name="username" id="userId" placeholder="邮箱"  autocomplete="on" value=""/></span></p>  <p><span class="input-bg"><input type="password" name="password" id="passWord" placeholder="密码" /></span></p>  <p><span style="float:left;margin-right:12px;" class="input-bg"><input type="text" name="captcha" id="captcha" placeholder="验证码" style="width:100px;" maxlength="4"//></span>    <img title="点击更换" style="cursor: pointer;" id="img_captcha" url="http://baige.aliapp.com/foodapp/yzm.php" src="http://baige.aliapp.com/foodapp/yzm.php" onclick = "myFunction()"/>  </p>  <p class="btnpanel">    <input type="hidden" id="lt" name="lt" value="LT-1417766126rQMOlvHi6p5O0TwVZEH" />    <input type="hidden" id="captcha_i" name="captcha_i" value="568457" />    <input type="hidden" id="service" name="service" value="http://www.umeng.com/users/login_redirect" />    <input type="submit" value="登 录" class="submit" id="login-submit" accesskey="l"/>    <span>      <a href="http://www.umeng.com/users/password/new" class="forget">忘记密码?</a>      <a href="http://www.umeng.com/users/sign_up" class="reg">注册</a>    </span>  </p></form></body><html>

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