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A simple example of JavaScript implementing digital verification code

Source: Internet
Author: User
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  This article is mainly on the JavaScript implementation of a simple example of digital verification code, the need for friends can come to the reference, I hope to help you.

Examples are as follows: The code is as follows: <! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd "> <html xmlns=" http://www.w3.org/1999/xhtml "> <head> <meta http-equiv=" Content-type "content=" text/html; charset=gb2312 "/>     <TITLE>JS Verification Code </title>       <style type=" Text/css ">          . Code            {         &NBS P     Background-image:url (code.jpg);                font-family:arial;                font-style:italic;                color:red;                border:0;                padding:2px 3px;                letter-spacing:3px;      &nbsP         Font-weight:bolder;            {          . Unchanged            {               border:0;            }        </style>     <script language= "javascript" type= "Text/javascript" >          var code; In global definition verification code         function createcode ()         {           code = "";           var codelength = 4;//Verification Code length           var Checkcode = document.getElementById ("Checkcode");           var Selectchar = new Array (0,1,2,3,4,5,6,7,8,9);//All candidate components of the verification code, of course, can also be used in Chinese              for (var i=0;i<codelength;i++)           {                        var CharIndex = M Ath.floor (Math.random () *10);           code +=selectchar[charindex];                       &NBSP,   //    &N Bsp Alert (code);           if (checkcode)           {            checkcode.classname= "code";             checkcode.value = code;          &nbsp,          &nbsp,          &NBS P function validate ()         {          var Inputcode = document.g Etelementbyid ("INPUT1"). Value;           if (inputcode.length <=0)           { &NBSp            alert ("Please enter the verification code!") ");          &nbsp,           else if (inputcode!= code)           {             alert ("Validation code input Error!") ");              Createcode ()/Refresh Verification Code             &nbsp ;        else           {            a Lert ("OK");          &nbsp,             }        &NBS P </script>   </head>   <body onload= "Createcode ()" >   <form  action= "#" > & nbsp      <input  type= "text"   id= "input1"/>       <input type= "text" Onclic K= "Createcode ()" readonly= "readonly" id= "Checkcode" class= "unchanged" style= "width:80px" /><br/>       <input id= "Button1"  onclick= "Validate" (); "type=" button "value=" OK "/>     </form>   </body>   </html>    

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