javascript實現數字+字母驗證碼的簡單實例

2024-05-06 16:00:32

字體：大中小

來源：轉載

供稿：網友

本篇文章只要是對javascript實現數字+字母驗證碼的簡單實例進行了介紹，需要的朋友可以過來參考下，希望對大家有所幫助

實例如下：

復制代碼代碼如下:

<!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>js驗證碼</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 ; //在全局定義驗證碼
     function createCode()
     {
       code = "";
       var codeLength = 4;//驗證碼的長度
       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','wW','x','y','z');//所有候選組成驗證碼的字符，當然也可以用中文的

       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("請輸入驗證碼！");
       }
       else if(inputCode != code )
       {
          alert("驗證碼輸入錯誤！");
          createCode();//刷新驗證碼
       }
       else
       {
         alert("OK");
       }

       }

    </script>
</head>
<body>
<form action="#">
     <input type="text"   />
    <input type="text" readonly="readonly" /><br />
    <input type="button" value="確定" />
</form>
</body>
</html>