<div class="htmlarea"> <textarea id="runcode87569"> <title>javascript 验证码实现代码_脚本之家测试</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> <form action="#"> <input type="text" id="input1"> <input type="text" onclick="createCode()" readonly id="checkCode" class="unchanged" style="width: 80px"> <input id="Button1" onclick="validate();" type="button" value="确定"> </form> </textarea> <br><input onclick="runEx('runcode87569')" type="button" value="运行代码"><input onclick="doCopy('runcode87569')" type="button" value="复制代码"> <input onclick="doSave(runcode87569)" type="button" value="保存代码"> <a href="http://www.jb51.net/article/23421.htm" title="查看具体详情" target="_blank">[Ctrl A 全选 注:</a>如需引入外部Js需刷新才能执行</div>]<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; } } function validate () { var inputCode = document.getElementById("input1").value; if(inputCode.length <=0) { alert("请输入验证码！"); } else if(inputCode != code ) { alert("验证码输入错误！"); createCode();//刷新验证码 } else { alert("^-^ OK"); } } </script>
