很low的四位验证码实现

<html>

    <head>

        <meta charset="utf-8">

    </head>

    <body>

        <input type="text" id="codeIn"><br>

        <span id="codebox">AAAA</span>

        <button type="button" id="codec">看不清换一张</button>

    </body>

    <script>

        let codeIn = document.querySelector("#codeIn"),

            codebox = document.querySelector("#codebox"),

            codec = document.querySelector("#codec");

            /*

                queryCode

                @param:none

                @rerurn:none

            */

           function queryCode(){

               let area = 'akjgf301290987tfhcn29';

               let result = '';

               for(let i=0; i<4; i++)

               {

                    let ran = Math.round(Math.random()*area.length-1);

                    result += area[ran];

               }

               codebox.innerHTML = result;

           }

           codec.onclick = function(){

               queryCode();

           }

           codeIn.onblur = function(){

               let val = codeIn.value,

                    code = codebox.innerHTML;

                    if(val.toLowerCase() === code.toLowerCase())

                    {

                        alert("验证成功");

                    }

                    else{

                        codeIn.value = '';

                        alert("验证失败，请重新输入");

                        queryCode();

                    }

           }

    </script>

</html>
巴特西

很low的四位验证码实现

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