javascript 驗證碼生成代碼推薦學習

2019-11-21 01:17:51

字體：大中小

來源：轉載

供稿：網友

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head> <title>javascript 驗證碼實現代碼_武林網測試</title> <style type="text/css"> .code {}{ background-image:url(code.jpg); font-family:Arial; font-style:italic; color:Red; border:0; padding:2px 3px; letter-spacing:3px; font-weight:bolder; } .unchanged {}{ border:0; } </style> <script language="javascript" type="text/javascript"> var code ; //在全局 定義驗證碼 function createCode() { code = ""; var codeLength = 6;//驗證碼的長度 var checkCode = document.getElementById("checkCode"); var selectChar = 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');//所有候選組成驗證碼的字符，當然也可以用中文的 for(var i=0;i<codeLength;i++) { var charIndex = Math.floor(Math.random()*36); code +=selectChar[charIndex]; } if(checkCode) { checkCode.className="code"; checkCode.value = code; } } function validate () { var inputCode = document.getElementById("input1").value; if(inputCode.length <=0) { alert("請輸入驗證碼！"); } else if(inputCode != code ) { alert("驗證碼輸入錯誤！"); createCode();//刷新驗證碼 } else { alert("^-^ OK"); } } </script> </head> <body onload="createCode()"> <form action="#"> <input type="text" id="input1" /> <input type="text" onclick="createCode()" readonly="readonly" id="checkCode" class="unchanged" style="width: 80px" /> <input id="Button1" onclick="validate();" type="button" value="確定" /> </form> </body> </html>

[Ctrl+A 全選注:如需引入外部Js需刷新才能執行]

上一篇：javascript new 需不需要繼續使用

下一篇：ExtJS GTGrid 簡單用戶管理