Spiral recursive in js

gistfile1.js

var mySpiral =function(a,b,c,d){
  var solution = [];
  var lengthOfSegment = 0; 
  var sens = 1;
  var add=-1;
     var spiralGrid=function( Width,Height,Row,Col,currentPositionOnSegment){  
                
        var index = Height*(Row-1)+Col; 
        solution.push(index);

        if (solution.length===Width*Height) return;
        if(lengthOfSegment===currentPositionOnSegment && sens===-1){              
                sens=1; 
                currentPositionOnSegment=0;
                Col+=add;
                add*=-1;
                ++lengthOfSegment;
        } else if (lengthOfSegment!==currentPositionOnSegment && sens===-1){
                ++currentPositionOnSegment;
                Col+=add;
        }else if(lengthOfSegment===currentPositionOnSegment && sens===1){
                sens=-1;                        
                currentPositionOnSegment=0;
                Row+=add;
        }else if(lengthOfSegment!==currentPositionOnSegment && sens===1){
                ++currentPositionOnSegment;
                Row+=add;
        }   
        spiralGrid(Width,Height,Row,Col,currentPositionOnSegment);
        }
  spiralGrid(a,b,c,d,0);
  return solution;
}

var first = mySpiral(5,5,3,3);
var second = mySpiral(2,4,1,2)