純數字的驗證碼
阿新 • • 發佈：2018-12-10
<html> <head> <title>純字驗證碼</title> <meta http-equiv='content-type' content='text/html;charset=utf-8'/> <script type='text/javascript'> var code ; //在全域性定義驗證碼 function createCode(){ code = ""; var codeLength = 4;//驗證碼的長度 var checkCode = document.getElementById("code"); var random = 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','W','X','Y','Z');//隨機數 for(var i = 0; i < codeLength; i++) {//迴圈操作 var index = Math.floor(Math.random()*36);//取得隨機數的索引（0~35） code += random[index];//根據索引取得隨機數加到code上 } checkCode.value = code;//把code值賦給驗證碼 } //校驗驗證碼 function validate(){ var inputCode = document.getElementById("input").value.toUpperCase(); //取得輸入的驗證碼並轉化為大寫 if(inputCode.length <= 0) { //若輸入的驗證碼長度為0 alert("請輸入驗證碼！"); //則彈出請輸入驗證碼 }else if(inputCode != code ) { //若輸入的驗證碼與產生的驗證碼不一致時 alert("驗證碼輸入錯誤！@[email protected]"); //則彈出驗證碼輸入錯誤 createCode();//重新整理驗證碼 document.getElementById("input").value = "";//清空文字框 }else { //輸入正確時 alert("合格！^-^"); } } </script> <style type='text/css'> #code{ font-family:Arial,宋體; font-style:italic; color:green; border:0; padding:2px 3px; letter-spacing:3px; font-weight:bolder; } </style> </head> <body onload='createCode()'> <div>驗證碼： <input type = "text" id = "input"/> <input type="button" id="code" onclick="createCode()" style="width:60px" title='點選更換驗證碼' /> <input type = "button" value = "驗證" onclick = "validate()"/> </div> </body> </html>
效果：
