JavaScript實現隨機碼的生成與校驗

JavaScript之隨機碼的生成與校驗,供大傢參考,具體內容如下

由於獲取事件源有兩種寫法,所以在此處都附上:

這個是直接用var去定義的

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>隨機驗證碼校驗</title>
    <style type="text/css">
        #code{
            width: 100px;
            height: 100px;
            background-color: #ddd;
            padding: 10px;
            line-height: 100px;
            text-align: center;
            font-size: 20px;
            color: red;
            /*font-weight: bold;*/
        }
    </style>
</head>
<body>
    <div id="code"></div>
    <input type="text" name="" id="newCode">
    <input type="button" name="" id="validate" value="驗證">
    <script type="text/javascript">
        window.onload = function (){
            var code;
            // 1.獲取對應的標簽
            var codeDiv = document.getElementById("code");
            var newCodeInput = document.getElementById("newCode");
            var validate = document.getElementById("validate");

            // 加載頁面獲取對應驗證碼
            creatCode()

            // 1.獲取min到max之間的整數 1~100
            function random(max,min){
                return Math.floor(Math.random()*(max-min)+min);
            }

            function creatCode(){
                code = "";
                // 設置長度
                var codeLenth = 4;
                var randomCode =[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"];
                for(var i=0;i<codeLenth;i++){
                    // 設置隨機范圍36范圍
                    var index = random(0,36);
                    code += randomCode[index];
                }
                codeDiv.innerHTML = code;
            }
            // 驗證按鈕校驗
            validate.onclick = function (){
                // 獲取輸入用戶的驗證碼
                var newCode = newCodeInput.value.toUpperCase();
                if (newCode === code){
                    // 驗證成功  跳轉對應的網址
                    window.location.href = "http://www.baidu.com";
                }else {
                    // 驗證失敗
                    alert("驗證失敗,請重新輸入")
                    // 輸入框置空
                    newCodeInput.value = "";
                    // 重新獲取驗證碼
                    creatCode();
                }
            }
        }
    </script>
</body>
</html>

這個是用function定義變量的:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>隨機驗證碼校驗</title>
    <style type="text/css">
        #code{
            width: 100px;
            height: 100px;
            background-color: #ddd;
            padding: 10px;
            line-height: 100px;
            text-align: center;
            font-size: 20px;
            color: red;
            /*font-weight: bold;*/
        }
    </style>
</head>
<body>
    <div id="code"></div>
    <input type="text" name="" id="newCode">
    <input type="button" name="" id="validate" value="驗證">
    <script type="text/javascript">
        window.onload = function (){
            var code;
            // 1.獲取對應的標簽(獲取事件源)
            function $(id){
                return typeof id === "string"?document.getElementById(id):null;
            }

            // 加載頁面獲取對應驗證碼
            creatCode()

            // 1.獲取min到max之間的整數 1~100
            function random(max,min){
                return Math.floor(Math.random()*(max-min)+min);
            }

            function creatCode(){
                code = "";
                // 設置長度
                var codeLenth = 4;
                var randomCode =[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"];
                for(var i=0;i<codeLenth;i++){
                    // 設置隨機范圍36范圍
                    var index = random(0,36);
                    code += randomCode[index];
                }
                $("code").innerHTML = code;
            }
            // 驗證按鈕校驗
            $("validate").onclick = function (){
                // 獲取輸入用戶的驗證碼
                var newCode = $("newCode").value.toUpperCase();
                if (newCode === code){
                    // 驗證成功  跳轉對應的網址
                    window.location.href = "http://www.baidu.com";
                }else {
                    // 驗證失敗
                    alert("驗證失敗,請重新輸入")
                    // 輸入框置空
                    $("newCode").value = "";
                    // 重新獲取驗證碼
                    creatCode();
                }
            }
        }
    </script>
</body>
</html>

兩種方式所實現效果一樣。附上效果圖:

當輸入錯誤的數據進行驗證時,會提示:

當輸入正確的數據進行驗證時,點擊驗證,如果驗證成功,會跳轉指定路徑。

以上就是本文的全部內容,希望對大傢的學習有所幫助,也希望大傢多多支持WalkonNet。