JS achieve random digital alphabet verification code

The example of this article shared the specific implementation code of the digital alphabetical verification code for everyone, for the purposes of reference, the specific content is as follows

Verification code:

js实现随机数字字母验证码

  Pure word verification code      var code; / / Global definition verification code function Createcode () {code = ""; var codelength = 4; // Verification code length var checkcode = document.getlementByid ("code"); var random = 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'; // Random number for (VAR i = 0; i  #code {font-family: arial, Song; Font-style: italic; color: Green; border: 0; Padding: 2px 3px; letter-spacing: 3px; font-weight: bolder;}   < codeLength; i++) {//循环操作  
        var index = Math.floor(Math.random()*36);//取得随机数的索引(0~35)  
        code += random[index];//根据索引取得随机数加到code上  
      }  
      checkCode.value = code;//把code值赋给验证码  
    } 
    //校验验证码  
    function validate(){  
      var inputCode = document.getElementById("input").value.toUpperCase(); //取得输入的验证码并转化为大写     
      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 != code ) { //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!@_@"); //则弹出验证码输入错误  
        createCode();//刷新验证码  
        document.getElementById("input").value = "";//清空文本框  
      }else { //输入正确时  
        alert("合格!^-^"); 
      } 
    } 
         
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