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发布时间：2021-08-27 作者：admin
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这篇文章给大家分享的是怎样用js实现生成验证码并校验的内容。小编觉得挺实用的，在很多注册登录页面都能使用到，因此分享给大家做个参考，感兴趣的朋友就继续往下看吧。

JavaScript之随机码的生成与校验，供大家参考，具体内容如下

由于获取事件源有两种写法，所以在此处都附上：

这个是直接用var去定义的

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>随机验证码校验</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="验证">
    <script type="text/javascript">
        window.onload = function (){
            var code;
            // 1.获取对应的标签
            var codeDiv = document.getElementById("code");
            var newCodeInput = document.getElementById("newCode");
            var validate = document.getElementById("validate");

            // 加载页面获取对应验证码
            creatCode()

            // 1.获取min到max之间的整数 1~100
            function random(max,min){
                return Math.floor(Math.random()*(max-min)+min);
            }

            function creatCode(){
                code = "";
                // 设置长度
                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++){
                    // 设置随机范围36范围
                    var index = random(0,36);
                    code += randomCode[index];
                }
                codeDiv.innerHTML = code;
            }
            // 验证按钮校验
            validate.onclick = function (){
                // 获取输入用户的验证码
                var newCode = newCodeInput.value.toUpperCase();
                if (newCode === code){
                    // 验证成功  跳转对应的网址
                    window.location.href = "http://www.baidu.com";
                }else {
                    // 验证失败
                    alert("验证失败，请重新输入")
                    // 输入框置空
                    newCodeInput.value = "";
                    // 重新获取验证码
                    creatCode();
                }
            }
        }
    </script>
</body>
</html>

这个是用function定义变量的：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>随机验证码校验</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="验证">
    <script type="text/javascript">
        window.onload = function (){
            var code;
            // 1.获取对应的标签(获取事件源)
            function $(id){
                return typeof id === "string"?document.getElementById(id):null;
            }

            // 加载页面获取对应验证码
            creatCode()

            // 1.获取min到max之间的整数 1~100
            function random(max,min){
                return Math.floor(Math.random()*(max-min)+min);
            }

            function creatCode(){
                code = "";
                // 设置长度
                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++){
                    // 设置随机范围36范围
                    var index = random(0,36);
                    code += randomCode[index];
                }
                $("code").innerHTML = code;
            }
            // 验证按钮校验
            $("validate").onclick = function (){
                // 获取输入用户的验证码
                var newCode = $("newCode").value.toUpperCase();
                if (newCode === code){
                    // 验证成功  跳转对应的网址
                    window.location.href = "http://www.baidu.com";
                }else {
                    // 验证失败
                    alert("验证失败，请重新输入")
                    // 输入框置空
                    $("newCode").value = "";
                    // 重新获取验证码
                    creatCode();
                }
            }
        }
    </script>
</body>
</html>

两种方式所实现效果一样。附上效果图：