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="80px"/><br/> 44 <input id="Button1" onclick="validate();" type="button" value="确定" /> 45 </form> 46 </body> 47 </html>