nitro.html

 var nitropress=new Date();
 var nitroend=new Date();
 var flagtime=false;

 function gamePlay(){
 console.log(car.status);
    if(!car.status){
 
         ctx.clearRect(0,0,canvas.width,canvas.height);
  background();
      drawCar();
    //	console.log(obstacle.status      +"      "+ obstacle.x_coordinate+"    "+obstacle.y_coordinate+"    "+obstacle.oldObject);
      if(nitroPress)
       	{ dy=4;
          drawNitro();
          if(!flagtime)
          	 {nitropress=Date.now();
          	  flagtime++;
          	 }  	
       	}
       	 nitroend=Date.now();
         
         if(Math.floor(((nitroend-nitropress)/1000)%60)>2)
         	{   nitroPress=false;
         		dy=2;
             	ctx.clearRect(car.x+15,car.y+145,70,45);
             	flagtime=0;
             }
                       
    	if(obstacle.y>canvas.height){
         obstacle.status = false;
         obstacle.oldObject=false;
         obstacle.y = 0;
         //obstacleGeneration(obstacle.x_coordinate,obstacle.y_coordinate,obstacle.width,obstacle.height,obstacle.status);

    	}
      
      
      obstacle.y = obstacleMovement(obstacle.y,obstacle.speed);
      
      detect(obstacle.x,obstacle.y,obstacle.width,obstacle.height);


    	drawObstacle(obstacle.x,obstacle.y,obstacle.width,obstacle.height,obstacle.status);
      
    	
       }
    else{
     ctx.drawImage(gameover,130,80,250,180);

      ctx.beginPath();
      ctx.rect(130,260,250,100);
      ctx.fill();
 
    
      ctx.font="bold 25px serif";
      ctx.fillStyle="green";
      ctx.fillText("Press enter to start",153,280);
      ctx.fillStyle="black";
      ctx.closePath();
    
    }
    requestAnimationFrame(gamePlay);
    ctx.fillStyle="black";
    if(enterPress==true)
     document.location.reload();  
 }