廢話不多說了,直接給大家貼代碼了,具體代碼如下所示:
<html> <head> <title>驗證碼</title> <style type="text/css"> #code { font-family:Arial; font-style:italic; font-weight:bold; border:0; letter-spacing:2px; color:blue; } </style> <script type = "text/javascript" src = "checkCode.js"> </script> </head> <body> <div> <input type = "text" id = "input"/> <input type = "button" id="code" onclick="createCode()"/> <input type = "button" value = "驗證" onclick = "validate()"/> </div> </body> </html>
checkCode.js
var code ; //在全局定義驗證碼 //產生驗證碼 window.onload = 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++) {//循環操作 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!@_@"); //則彈出驗證碼輸入錯誤 createCode();//刷新驗證碼 document.getElementById("input").value = "";//清空文本框 } else { //輸入正確時 alert("^-^"); //彈出^-^ } }
以上所述是小編給大家介紹的JavaScript生成驗證碼並實現驗證功能,希望對大家有所幫助,如果大家有任何疑問請給我留言,小編會及時回復大家的。在此也非常感謝大家對網站的支持!