<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</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> </head> <body onLoad="createCode()"> <script language="javascript" type="text/javascript"> var code ; //在全局 定义验证码 function createCode() { code = ""; var codeLength = 6;//验证码的长度 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');//所有候选组成验证码的字符，当然也可以用中文的 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; checkCode.blur(); } } function validate () { var inputCode = document.getElementById("validCode").value; if(inputCode.length <=0) { alert("请输入验证码！"); } else if(inputCode.toUpperCase() != code ) { alert("验证码输入错误！"); createCode();//刷新验证码 } else { alert("^-^ OK"); } } </script> <form action="#"> <input type="text" id="validCode" /> <input type="text" onClick="createCode()" readonly="readonly" id="checkCode" class="unchanged" style=" 80px;cursor:pointer" /><br /> <input id="Button1" onclick="validate();" type="button" value="确定" /> </form> </body> </html>
从网上找了个js验证码的实例来留个笔记。。。