JavaScript to implement the web version of the snake game

This article shares the specific code for JavaScript to implement the webpage snake game for your reference. The specific content is as follows

<!DOCTYPE html>
<html>
<head><title>Snake</title>
</head>
<body>
<canvas id="canvas" width="400" height="400"></canvas>
<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.js"></script>
<script>
var canv = document.getElementById("canvas");
var ctx = canv.getContext("2d");
var score=0;
//Define a block constructor var Block = function (col, row, size)
{
  this.col=col;
  this.row=row;
  this.size=size;
    };
//Define the prototype method draw of the Block function;
Block.prototype.draw = function()
{
  ctx.fillRect(this.col*this.size,this.row*this.size,this.size,this.size)
   }
//Define object snake var snake = {
  body:[
    new Block(20,20,10),
    new Block(20,21,10),
    new Block(20,22,10)
   ],
  direction:"right",
  };

//Define the function of drawing snake snake.draw=function()
{
   for(var i=0;i<this.body.length;i++)
  {
     this.body[i].draw();
        }
   };

snake.move = function()
         {
          var head = this.body[0];

if(snake.direction=="right")
     {    
     var newhead = new Block (head.col + 1, head.row, head.size)
            }
  
  if(snake.direction == "left")
   
     { 
     var newhead = new Block(head.col-1,head.row,head.size); 
           }  
 if(snake.direction=="up")
     {
     var newhead = new Block (head.col, head.row-1, head.size)
           }
    if(snake.direction=="down")
     {
     var newhead = new Block (head.col, head.row+1, head.size)
           } 
          if(newhead.col<0 || newhead.col>39 )
          {
           clearInterval(intervalId);
           gameover();
          }
          
          if(newhead.row<0 || newhead.row>39 )
          {
           clearInterval(intervalId);
           gameover();
          }
 for(var i=0;i<this.body.length;i++)
{
    if(this.body[i].col==newhead.col &&this.body[i].row==newhead.row)
  {
    clearInterval(intervalId);
    gameover();
      }
          }         
     this.body.unshift(newhead);
     if(newhead.col==apple.posX &&newhead.row==apple.posY)
{  
    score=score+100;
    while(true)
  {
     var checkApple =false;
     apple.posX=Math.floor(Math.random()*40);
     apple.posY=Math.floor(Math.random()*40);
     for(var i=0; i<this.body.length;i++)
   {
     if(this.body[i].col==apple.posX &&this.body[i].row==apple.posY)
          checkApple=true;
                        }
       if(!checkApple)
       break;
      }  
  }
else{
     this.body.pop();
        }         
         };
//Create an apple object var apple={
    posX:Math.floor(Math.random()*40),
    posY:Math.floor(Math.random()*40),
    sizeR:5
}
//Draw apple function apple.draw=function()
{
  ctx.fillStyle="Green";
  ctx.beginPath();
  ctx.arc(this.posX*10+5,this.posY*10+5,5,0,Math.PI*2,false);
  ctx.fill();
  ctx.fillStyle="Black";
     };
//End var gameover = function()
{
  ctx.font="60px Comic Sans MS";
  ctx.textAlign="center";
  ctx.textBaseline="middle";
  ctx.fillText("GAME OVER!",200,200)
    };
// Timing function var intervalId = setInterval (function ()
{
   ctx.clearRect(0,0,400,400);
   ctx.font="20px Arial";
   ctx.fillText("Score:"+score,5,15);
   snake.draw();
   snake.move();
   apple.draw();
   ctx.strokeRect(0,0,400,400);
    },200);
//Snake key control $("body").keydown(function(event)
{
   console.log(event.keyCode);
    if(event.keyCode==37 &&snake.direction!="right")
     {
    snake.direction="left";
         }
    if(event.keyCode==38 &&snake.direction!="down")
     {
    snake.direction="up";
        }
    if(event.keyCode==39 &&snake.direction!="left")
     {
     snake.direction="right";
         }
     if(event.keyCode==40 &&snake.direction!="up")
     {
     snake.direction="down";
         }
              }
);
</script>
</body>
</html>

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