Using JavaScript to add two large numbers

(function () {var addlarge = function (n1,n2) {var over = 0;  
      
      
var ret = "";  
var len = math.min (n1.length,n2.length);  
var sln1 = n1.substr (n1.length-len,n1.length);  
      
var sln2 = n2.substr (n2.length-len,n2.length);  
for (var i = len;i > 0; i--) {var di = parseint (sln1[i-1]);  
      
var dj = parseint (Sln2[i-1]); RET = (over + di + dj) >= 10?  
      
(Over + di + DJ)-+ ret): ((OVER+DI+DJ) + ret); over = ((over + di + DJ)/10) |  
      
0; } if (N1.length!= n2.length) {if (N1.length > n2.length) {ret = Addlarge (N1.SUBSTR (  
0,n1.length-len), over.tostring () + ret;  
else{ret = Addlarge (N2.substr (0,n2.length-len), over.tostring ()) + ret;  
return ret;  
      
else{if (over > 0) ret = over + ret;  
return ret;  
      
}  
      
      
};  
var L1 = "9999999999999";  
var L2 = "1111111111111";  
var r = addlarge (L1,L2);  
      Console.log (R);
      
      
})(); 

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