JavaScript Random authentication code Generation instance Code _javascript technique

Generation of random verification codes

1: The main part

<script> var code; 
    The global definition Validation code function createcode () {code = ""; 
    var codelength = 6;//The length of the authentication code var checkcode = document.getElementById ("Checkcode"); 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 ');//All the characters of the candidate composing the verification code, of course, can also be in Chinese for (Var i=0;i<codelength;i++) { 
    var charIndex = Math.floor (Math.random () *36); 
     
     
    Code +=selectchar[charindex]; 
    }//alert (code); 
     if (Checkcode)//Here is not very understand, there are experts can explain the next {checkcode.classname= "code"; 
    Checkcode.value = code; 
    The function validate () {var inputcode = document.getElementById ("INPUT1"). Value; if (Inputcode.length <=0) {alert ("Please enter the verification code!") 
      "); 
    document.getElementById ("INPUT1"). focus (); else if (Inputcode!= code) {alert ("Validation code input Error!) 
     "); Createcode ()//Refresh Verification Code Inputcode= ""; 
    document.getElementById ("INPUT1"). focus (); 
    }else{Document.frmRegister.submit (); 
 

 }} <script>

Then how do I put it in the validation box?

<input type= "text" id= "Checkcode" class= "unchanged" style= "width:80px" readonly/>

And then there's the judgment.

<input type= "text" onclick= "Createcode ()" id= "Input1"/>

Ok.... Get... The Onclik here is to move away as soon as you move.

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