Sharing an example of jQuery implementing a simple verification code function-JS Tutorial-php.cn

Sharing an example of jQuery implementing a simple verification code function

小云云

Release： 2018-01-06 10:10:02

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This article mainly shares with you a simple verification code function based on jquery. The code is simple and easy to understand, very good, and has reference value. Friends who need it can refer to it. I hope it can help everyone.

In the process of learning jQuery, I wrote a simple small example of a verification code and recorded it for future reference. The source code is as follows:

<!DOCTYPE html> 
<html> 
<head> 
  <title></title> 
  <style type="text/css"> 
  p{ 
    background-color:blue; 
    width:200px; 
    height:100px; 
    font-size:35px; 
  } 
  </style> 
  <script src="../jquery-1.8.0.js" type="text/javascript"></script> 
  <script type="text/javascript"> 
    $(document).ready(function() { 
       //我写的验证码 
      //验证码 
      var code; 
      function createCode(){ 
        code = &#39;&#39;;//首先默认code为空字符串 
        var codeLength = 4;//设置长度，这里看需求，我这里设置了4 
        var codeV = $("p"); 
        //设置随机字符 
        var random = new Array(0,1,2,3,4,5,6,7,8,9,&#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;); 
        for(var i = 0; i < codeLength; i++){ //循环codeLength 我设置的4就是循环4次   
           var index = Math.floor(Math.random()*36); //设置随机数范围,这设置为0 ~ 36  
           code += random[index]; //字符串拼接 将每次随机的字符 进行拼接 
      } 
        codeV.text(code);//将拼接好的字符串赋值给展示的Value 
      } 
      //页面开始加载验证码 
      createCode(); 
      //验证码p加载点击事件 
      $("p").bind(&#39;click&#39;,function() { 
          createCode(); 
        }); 
      //下面就是判断是否==的代码，无需解释 
      $("#b1").bind(&#39;click&#39;,function() { 
         var oValue = $("#in1").val().toUpperCase(); 
         $("#l1").html(""); 
        if(oValue ==""){ 
          $("#l1").html("<font color=&#39;red&#39;>请输入验证码</font>"); 
        }else if(oValue != code){ 
          $("#l1").html("<font color=&#39;red&#39;>验证码不正确，请重新输入</font>"); 
          oValue = ""; 
          createCode(); 
        }else{ 
          $("#l1").html("<font color=&#39;blue&#39;>验证码正确</font>"); 
        } 
      });  
    }); 
  </script> 
</head> 
<body> 
<center> 
<label >请输入验证码：</label><input type="text" id="in1" value="" placeholder="请输入验证码"> 
<button id="b1">点击验证</button> 
  <p></p><label id="l1"></label> 
</center> 
</body> 
</html>

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