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[JavaScript] 简易的验证码 →→→→→进入此内容的聊天室

来自 , 2019-08-27, 写在 JavaScript, 查看 159 次.
URL http://www.code666.cn/view/b5b8c484
  1. <script language="javascript" type="text/javascript">
  2.  createCode();
  3. var code; //在全局 定义验证码  
  4. function createCode() {
  5.   code = "";
  6.   var codeLength = 4;//验证码的长度  
  7.   var checkCode = document.getElementById("checkCode");
  8.   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
  9.  
  10.   for (var i = 0; i < codeLength; i++) {
  11.     var charIndex = Math.floor(Math.random() * 36);
  12.     code += selectChar[charIndex];
  13.   }
  14.  
  15.   if (checkCode) {
  16.     checkCode.className = "code";
  17.     checkCode.value = code;
  18.   }
  19. }
  20.  
  21. function validate() {
  22.   var inputCode = document.getElementById("input1").value;
  23.   if (inputCode.length <= 0) {
  24.     alert("请输入验证码！");
  25.         createCode();//刷新验证码
  26.   } else if (inputCode != code) {
  27.     alert("验证码输入错误！");
  28.   createCode();//刷新验证码  
  29.   } else {
  30.   gosubmit();
  31.   }
  32. }
  33. </script>

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