Cara menggunakan code game html

<!DOCTYPEhtml>

<html>

    <head>

        //menghubungkan html dengan jquery

        <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>

        <title>Membuat Game Snake Dengan HTML5 dan JQuery</title>    

    </head>

    <body>

        <canvas id="ruang"width="500"height="500"></canvas>

        <script type="text/javascript">

            $(document).ready(function(){

              // deklarasi

              var ruang=$("#ruang")[0];

              var ctx=ruang.getContext("2d");

              var lebar= $("#ruang").width();

              var tinggi=$("#ruang").height();

              var cw=10;

              var tekan;

              var makanan;

              var nilai;

              //membuat cell aray untuk membuat ular

              var array_ular;

              function init(){

                tekan="right";//default direction

                create_snake();

                create_makanan();//membuat makanan untuk ular

                //nilai game

                nilai= 0;

                if(typeofgame_loop!="undefined")clearInterval(game_loop);

                game_loop= setInterval(paint,60);

            }

            init();

              // membuat ular

              function create_snake(){

                // menetapkan jumlah panjang awal ular

                var length=5;//panjang ular default

                array_ular =[];

                for(vari=length-1;i>=0;i--){

                  //membuat ular horizontal mulai dari arah kiri

                  array_ular.push({x:i,y:0});

              }

            }

              //membuat makanan untuk ular

              function create_makanan(){

                makanan={

                  x: Math.round(Math.random()*(lebar-cw)/cw),

                  y: Math.round(Math.random()*(tinggi-cw)/cw)

              };

            }

              //pengaturan

              function paint(){

                // warna background

                ctx.fillStyle= "#ecf0f1";

                ctx.fillRect(0,0,lebar,tinggi);    

                ctx.strokeStyle ="#2c3e50";

                ctx.strokeRect(0,0,lebar,tinggi);

                //membuat pergerakan untuk ular

                var nx=array_ular[0].x;

                var ny=array_ular[0].y;

                if (tekan=="right")nx++;

                else if(tekan=="left")nx--;

                else if(tekan=="up")ny--;

                else if(tekan=="down")ny++;

                //memeriksa tabrakan

                if(

                  nx==-1||

                  nx ==lebar/cw||

                  ny==-1||

                  ny==tinggi /cw||

                  cek_tabrakan(nx,ny,array_ular)

                  ){

                //restart game

            init();

            return;

            }

                //cek jika ular kena makanan/memakan makanan

                if(nx==makanan.x&& ny == makanan.y){

                  var ekor = { x: nx, y: ny };

                  nilai++;

                  //membuat makanan yang baru

                  create_makanan();

              }else{

                  var ekor=array_ular.pop();

                  ekor.x=nx;

                  ekor.y =ny;

              }

              array_ular.unshift(ekor);

              for(var i=0;i<array_ular.length;i++){

                  varc=array_ular[i];

                  paint_cell(c.x, c.y);

              }

              paint_cell(makanan.x,makanan.y);    

                //membuat penilaian skor

                var nilai_text="nilai: "+nilai;

                ctx.fillText(nilai_text,5, tinggi-5);

            }

            function paint_cell(x,y){

                ctx.fillStyle ="#1abc9c";

                ctx.fillRect(x*cw,y*cw,cw,cw);

                ctx.strokeStyle ="#ecf0f1";

                ctx.strokeRect(x*cw,y*cw,cw,cw);

            }

            function cek_tabrakan(x,y,array){

                for(vari=0;i<array.length; i++){

                  if(array[i].x==x&& array[i].y == y) return true;

              }

              return false;

            }

              //kontrol ular dengan keyboard

              $(document).keydown(function(e){

                var key=e.which;

                if(key=="37"&& tekan != "right") tekan = "left";

                else if(key=="38"&& tekan != "down") tekan = "up";

                else if(key=="39"&& tekan != "left") tekan = "right";

                else if(key=="40"&& tekan != "up") tekan = "down";

            });

            });

            </script>

        </body>

</html>