dispart 52 object into 4 gruop JavaScript

i want to dispart 52 object into 4 gruop using JavaScript, but i don't know what happen with this syntax, i'm a rookie

 while(card.length > 52){
                          var randomnumber=Math.ceil(Math.random()*100)
                          var found=false;
                          for(var i=0;i<card.length;i++){
                            if(card[i]==randomnumber){found=true;break}
                          }
                          if(!found)card[card.length]=randomnumber;
                        }
                        document.write(card);