Explicare JavaScript

[Hertz]

Ar putea careva sa imi explice care e rezultatul acestui cod?

function Check(checksum)
{
   var tab = "                   azertyuiopqsdfghjklmwxcvbnAZERTYUIOPQSDFGHJKLMWXCVBN0123456789_$&#@";
   var entry = document.forms[1].elements[0].value;
   var n = entry.length;
   var sum = 1;
   for(var i=0;i   {
      var index = tab.indexOf(entry.substring(i,i+1));
      sum = sum+(index*n*i)*(index*i*i);
   }
   if(sum==checksum)
   {
      window.location = entry+".php";
   }
   else
   {
      alert("Wrong ! Try Again.");
   }   
   return false;
}

Partea de la var entry pana la if sum=checksum.

Nu inteleg ce face acel var entry=document.forms[1]...

[danieLs]

var entry = document.forms[1].elements[0].value;

atribuie variabilei entry valoarea primului element din al 2-lea form din pagina

restul e simplu :

indexOf -> http://www.w3schools.com/jsref/jsref_IndexOf.asp

substring -> http://www.w3schools.com/jsref/jsref_substring.asp

[SkullAds]