javascript - Stop overwriting in Tic Tac Toe -


this in regards how create turns in tic tac toe game? wanted add option box should not overwritten once clicked. used code below , have gone through , through material online several times can't seem figure out answer. it's making boxes x instead of x , o , x. unfortunately, working on web based editor doesn't support jquery , can't edit html either.

   var turn = "x";    function next()  {   turn = turn === "x" ? "o" : "x";   }    function play() {   if (this.innerhtml === "")    {    this.innerhtml == turn;    next();}  }        function click()     {       if (this.id == "cell1")     {        document.getelementbyid("cell1").innerhtml= turn;        play();     }         else if (this.id == "cell2")     {       document.getelementbyid("cell2").innerhtml = turn;       play();     }      else  if (this.id == "cell3")     {       document.getelementbyid("cell3").innerhtml = turn;       play();     }      else  if (this.id == "cell4")     {       document.getelementbyid("cell4").innerhtml = turn;       play();     }      else if (this.id == "cell5")     {       document.getelementbyid("cell5").innerhtml = turn;       play();     }       else if (this.id == "cell6")      {        document.getelementbyid("cell6").innerhtml = turn;        play();       }        else if (this.id == "cell7")       {         document.getelementbyid("cell7").innerhtml = turn;         play();        }         else if (this.id == "cell8")       {         document.getelementbyid("cell8").innerhtml = turn;         play();        }         else if (this.id == "cell9")        {          document.getelementbyid("cell9").innerhtml =turn;          play();         }     }       document.getelementbyid("cell1").onclick = click;      document.getelementbyid("cell2").onclick = click;      document.getelementbyid("cell3").onclick = click;      document.getelementbyid("cell4").onclick = click;      document.getelementbyid("cell5").onclick = click;      document.getelementbyid("cell6").onclick = click;      document.getelementbyid("cell7").onclick = click;      document.getelementbyid("cell8").onclick = click;      document.getelementbyid("cell9").onclick = click;

i know have been told not repeat code new @ this. maybe few months of practice make me confident enough - find clearer right now.

p.s: working fine before tried add function of stopping overwriting of cells. code before was: 

  var nextturn = 'x';   function changeturn(){   if(nextturn == 'x'){        nextturn = 'o';   } else {        nextturn = 'x';   }       }

for new option have changed nextturn turn , changeturn next - user earlier post.

i think meant this.innerhtml == turn; this.innerhtml = turn;

the first form comparison whereas second assignment


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