JavaScript如何实现随机码的生成与校验

2023-06-14 23:06:54 434人浏览八月长安

摘要

这篇文章给大家分享的是有关javascript如何实现随机码的生成与校验的内容。小编觉得挺实用的，因此分享给大家做个参考，一起跟随小编过来看看吧。JavaScript有什么特点1、js属于一种解释性脚本语言；2、在绝大多数浏览器的支持下，j

这篇文章给大家分享的是有关javascript如何实现随机码的生成与校验的内容。小编觉得挺实用的，因此分享给大家做个参考，一起跟随小编过来看看吧。

JavaScript有什么特点

1、js属于一种解释性脚本语言；2、在绝大多数浏览器的支持下，js可以在多种平台下运行，拥有着跨平台特性；3、js属于一种弱类型脚本语言，对使用的数据类型未做出严格的要求，能够进行类型转换，简单又容易上手；4、js语言安全性高，只能通过浏览器实现信息浏览或动态交互，从而有效地防止数据的丢失；5、基于对象的脚本语言，js不仅可以创建对象，也能使用现有的对象。

JavaScript之随机码的生成与校验，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;                    }    </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;                    }    </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：

JavaScript如何实现随机码的生成与校验