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constcanvas=document.getElementById('gameCanvas');constctx=canvas.getContext('2d');constplayer={x:180,y:550,width:40,height:40,speed:5,movingLeft:false,movingRight:false};letbullets=[];letenemies=[];letscore=0;letgameOver=false;
document.addEventListener('keydown',(e)=>{if(e.key==='ArrowLeft')player.movingLeft=true;if(e.key==='ArrowRight')player.movingRight=true;if(e.key===''){shootBullet();}});document.addEventListener('keyup',(e)=>{if(e.key==='ArrowLeft')player.movingLeft=false;if(e.key==='ArrowRight')player.movingRight=false;});
functionupdatePlayer(){if(player.movingLeft&&player.x>0)player.x-=player.speed;if(player.movingRight&&player.x+player.width
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functiongameLoop(){if(gameOver)return;ctx.clearRect(0,0,canvas.width,canvas.height);updatePlayer();drawPlayer();updateBullets();spawnEnemies();checkCollisions();//ÖØ¸´µ÷ÓÃrequestAnimationFrame(gameLoop);}
functiondrawPlayer(){ctx.fillStyle='blue';ctx.fillRect(player.x,player.y,player.width,player.height);}
functionupdateBullets(){bullets.forEach((b,index)=>{b.y-=b.speed;if(b.y+b.height<0){bullets.splice(index,1);}else{ctx.fillStyle='red';ctx.fillRect(b.x,b.y,b.width,b.height);}});}
functionspawnEnemies(){if(Math.random()<0.02){//ÿ֡·¢Éú¸ÅÂÊconstenemyX=Math.random()*(canvas.width-40);enemies.push({x:enemyX,y:0,width:40,height:40,speed:2+Math.random()*3});}enemies.forEach((enemy,index)=>{enemy.y+=enemy.speed;if(enemy.y>canvas.height){enemies.splice(index,1);//¿ÉÒÔÉ趨ÉúÃüÖµ¡¢ÓÎÏ·½áÊøÂß¼}else{ctx.fillStyle='green';ctx.fillRect(enemy.x,enemy.y,enemy.width,enemy.height);}});}
functioncheckCollisions(){bullets.forEach((b,bIndex)=>{enemies.forEach((e,eIndex)=>{if(b.xe.x&&b.ye.y){//ÅöײÀÖ³Éenemies.splice(eIndex,1);bullets.splice(bIndex,1);score+=10;//¿ÉÒÔÌí¼Ó±¬Õ¨¶¯»}});});}
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