1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
2 <html xmlns="http://www.w3.org/1999/xhtml" >
3 <head>
4 <title>验证码Demo</title>
5 <meta charset="UTF-8">
6 <style type="text/css">
7 .code {font-family:Arial;font-style:italic;color:Red;border:0;padding:2px 3px;letter-spacing:3px;font-weight:bolder;}
8 .unchanged{border:0;}
9 </style>
10 <script type="text/javascript">
11 var code;//在全局 定义验证码
12 function createCode(){
13 code = "";
14 var codeLength = 6;//验证码的长度
15 var checkCode = document.getElementById("checkCode");
16 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
17 for(var i=0;i < codeLength;i++){
18 var charIndex = Math.floor(Math.random()*36);
19 code +=selectChar[charIndex];
20 }
21 //alert(code);
22 if(checkCode){
23 checkCode.className="code";
24 checkCode.value = code;
25 }
26 }
27 function validate(){
28 var inputCode = document.getElementById("input1").value;
29 if(inputCode.length <= 0){
30 alert("请输入验证码！");
31 }else if(inputCode != code){
32 alert("验证码输入错误！");
33 createCode();//刷新验证码
34 }else{
35 alert("^-^ OK");
36 }
37 }
38 </script>
39 </head>
40 <body onload="createCode()">
41 <form action="#">
42 <input type="text" id="input1" />
43 <input type="text" onclick="createCode()" readonly="readonly" id="checkCode" class="unchanged" style="width:80px"/><br/>
44 <input id="Button1" onclick="validate();" type="button" value="确定" />
45 </form>
46 </body>
47 </html>
