本文實例為大家分享了js實現數字英文驗證碼的具體代碼，供大家參考，具體內容如下
<html><head><style type="text/css">.code{background-image:url(111.jpg);font-family:Arial,宋體;font-style:italic;color:green;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 = new Array();var codeLength = 4;//驗證碼的長度var checkCode = document.getElementById("checkCode");checkCode.value = "";var selectChar = new Array(2,3,4,5,6,7,8,9,'A','B','C','D','E','F','G','H','J','K','L','M','N','P','Q','R','S','T','U','V','W','X','Y','Z');for(var i=0;i<codeLength;i++) {var charIndex = Math.floor(Math.random()*32);code +=selectChar[charIndex];}if(code.length != codeLength){createCode();}checkCode.value = code;}function validate () {var inputCode = document.getElementById("input1").value.toUpperCase();if(inputCode.length <=0) {alert("請輸入驗證碼！");return false;}else if(inputCode != code ){alert("驗證碼輸入錯誤！");createCode();return false;}else {alert("成功！");return true;}}</script><meta http-equiv="Content-Type" content="text/html; charset=gb2312"></head><body onLoad="createCode();"><input type="text" id="input1" /><input type="button" id="checkCode" class="code" style="width:60px" onClick="createCode()" /> <a href="#" onClick="createCode()">看不清楚</a><input id="Button1" onClick="validate();" type="button" value="確定" /><script></script></body></html>以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持武林網。
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