效果圖:
代碼如下:
<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <style type="text/css"> #code{ width:80px; height:30px; font-size:20px; font-family:Arial; font-style:italic; font-weight:bold; border:0; letter-spacing:2px; color:blue; } </style> </head> <body> <div> <input type = "text" id = "input"/> <input type = "button" id="code" /> <input type = "button" value = "驗證" id="check"/> </div> <script type="text/javascript" src="http://libs.baidu.com/jquery/2.0.0/jquery.js"></script> <script type="text/javascript"> function change(){ code=$("#code"); // 驗證碼組成庫 var arrays=new Array( '1','2','3','4','5','6','7','8','9','0', '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', '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' ); codes='';// 重新初始化驗證碼 for(var i = 0; i<4; i++){ // 隨機獲取一個數組的下標 var r = parseInt(Math.random()*arrays.length); codes += arrays[r]; } // 驗證碼添加到input裡 code.val(codes); } change(); code.click(change); //單擊驗證 $("#check").click(function(){ var inputCode = $("#input").val().toUpperCase(); //取得輸入的驗證碼並轉化為大寫 console.log(inputCode); 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!=codes.toUpperCase()) { //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!請重新輸入"); //則彈出驗證碼輸入錯誤 change();//刷新驗證碼 $("#input").val("");//清空文本框 }else { //輸入正確時 alert("正確"); //彈出^-^ } }); </script> </body> </html>
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