jQuery实现验证码功能

效果图:

jQuery实现验证码功能

代码如下:

<!doctype html>
<html lang="en">
 <head>
 <meta charset="UTF-8">
 <title>Document</title>
 <style type="text/css">
 #code{
 width:80px;
 height:30px;
 font-size:20px;
 font-family:Arial; 
 font-style:italic; 
 font-weight:bold; 
 border:0; 
 letter-spacing:2px; 
 color:blue; 
 }
 </style>
 </head>
 <body>
<div> 
 <input type = "text" id = "input"/> 
 <input type = "button" id="code" /> 
 <input type = "button" value = "验证" id="check"/> 
   </div> 
 <script type="text/javascript" src="http://libs.baidu.com/jquery/2.0.0/jquery.js"></script>
<script type="text/javascript">
  function change(){
    code=$("#code");
  // 验证码组成库
   var arrays=new Array( 
       '1','2','3','4','5','6','7','8','9','0',
       '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', 
       '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'        
       ); 
    codes='';// 重新初始化验证码
   for(var i = 0; i<4; i++){
   // 随机获取一个数组的下标
   var r = parseInt(Math.random()*arrays.length);
   codes += arrays[r];
  }
  // 验证码添加到input里
     code.val(codes);
  }
  change();
 code.click(change);
 //单击验证
  $("#check").click(function(){
   var inputCode = $("#input").val().toUpperCase(); //取得输入的验证码并转化为大写 
   console.log(inputCode);
  if(inputCode.length == 0) { //若输入的验证码长度为0
   alert("请输入验证码!"); //则弹出请输入验证码
  }    
  else if(inputCode!=codes.toUpperCase()) { //若输入的验证码与产生的验证码不一致时
   alert("验证码输入错误!请重新输入"); //则弹出验证码输入错误
   change();//刷新验证码
   $("#input").val("");//清空文本框
  }else { //输入正确时
   alert("正确"); //弹出^-^
  } 
  });
</script>
 </body>
</html>

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