基于javascript实现数字英文验证码

2019-11-19 17:47:02

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本文实例为大家分享了js实现数字英文验证码的具体代码，供大家参考，具体内容如下

<html><head><style type="text/css">.code{background-image:url(111.jpg);font-family:Arial,宋体;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 定义验证码function createCode(){code = new Array();var codeLength = 4;//验证码的长度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("请输入验证码！");return false;}else if(inputCode != code ){alert("验证码输入错误！");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="确定" /><script></script></body></html>

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