Example sharing of jQuery implementation of verification code function-JS Tutorial-php.cn

Example sharing of jQuery implementation of verification code function

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Release： 2018-01-22 13:03:21

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Many programming languages can implement the verification code function. This article mainly introduces the sample code of jQuery to implement the verification code function, which has a good reference value. Let’s take a look at it with the editor. I hope it can help everyone.

Rendering:

##The code is as follows:

<!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>
<p> 
 <input type = "text" id = "input"/> 
 <input type = "button" id="code" /> 
 <input type = "button" value = "验证" id="check"/> 
   </p> 
 <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( 
       &#39;1&#39;,&#39;2&#39;,&#39;3&#39;,&#39;4&#39;,&#39;5&#39;,&#39;6&#39;,&#39;7&#39;,&#39;8&#39;,&#39;9&#39;,&#39;0&#39;,
       &#39;a&#39;,&#39;b&#39;,&#39;c&#39;,&#39;d&#39;,&#39;e&#39;,&#39;f&#39;,&#39;g&#39;,&#39;h&#39;,&#39;i&#39;,&#39;j&#39;, 
       &#39;k&#39;,&#39;l&#39;,&#39;m&#39;,&#39;n&#39;,&#39;o&#39;,&#39;p&#39;,&#39;q&#39;,&#39;r&#39;,&#39;s&#39;,&#39;t&#39;, 
       &#39;u&#39;,&#39;v&#39;,&#39;w&#39;,&#39;x&#39;,&#39;y&#39;,&#39;z&#39;, 
       &#39;A&#39;,&#39;B&#39;,&#39;C&#39;,&#39;D&#39;,&#39;E&#39;,&#39;F&#39;,&#39;G&#39;,&#39;H&#39;,&#39;I&#39;,&#39;J&#39;, 
       &#39;K&#39;,&#39;L&#39;,&#39;M&#39;,&#39;N&#39;,&#39;O&#39;,&#39;P&#39;,&#39;Q&#39;,&#39;R&#39;,&#39;S&#39;,&#39;T&#39;, 
       &#39;U&#39;,&#39;V&#39;,&#39;W&#39;,&#39;X&#39;,&#39;Y&#39;,&#39;Z&#39;        
       ); 
    codes=&#39;&#39;;// 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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