js生成验证码

矫情吗；* 2022-09-26 01:48 163阅读 0赞

<!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>
    <title>JS生成验证码</title>
    <style type="text/css">
    .code {
    background-image: url(code.jpg);
    font-family: Arial;
    font-style: italic;
    color: Red;
    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 = 6;//验证码的长度  
      var checkCode = document.getElementById("checkCode");
      var selectChar = 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');//所有候选组成验证码的字符，当然也可以用中文的  
      
      for (var i = 0; i < codeLength; i++) {
        var charIndex = Math.floor(Math.random() * 36);
        code += selectChar[charIndex];
      }
      //alert(code);
      if (checkCode) {
        checkCode.className = "code";
        checkCode.value = code;
      }
    }
      
    function validate() {
      var inputCode = document.getElementById("input1").value;
      if (inputCode.length <= 0) {
        alert("请输入验证码！");
      } else if (inputCode != code) {
        alert("验证码输入错误！");
      createCode();//刷新验证码  
      } else {
      alert("^-^ OK");
      }
    }
    </script>
    </head>
    <body οnlοad="createCode()">
    <form action="#">
      <input type="text" id="input1" /> <input type="text" οnclick="createCode()" readonly="readonly" id="checkCode" class="unchanged" style="width: 80px" /><br />
      <input id="Button1" οnclick="validate();" type="button" value="确定" />
    </form>
    </body>
    </html>