Javascript code HELP!

1

Hi

I need some help figuring out the remove function from my list.
It is not working properly any help would appreciated.
Here the code:

function List() { this.head = {data:null, next:null};
};


List.prototype.add = function(data) {
     var node = {
         data: data,
         next: this.head
     };
     this.head = node;
};


List.prototype.remove = function() {


      this.head = this.head.next;
      this.head.next = this.head.data;
       
      return this.head.data;  
  
};