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Script

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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Mini Battle Game</title>
<style>
body{
    margin:0;
    overflow:hidden;
    background:#222;
}
canvas{
    display:block;
    margin:auto;
    background:#5dbb63;
}
</style>
</head>
<body>

<canvas id="game" width="800" height="500"></canvas>

<script>
const canvas=document.getElementById("game");
const ctx=canvas.getContext("2d");

let player={
    x:100,
    y:250,
    size:25,
    color:"blue",
    speed:5
};

let enemy={
    x:650,
    y:250,
    size:25,
    color:"red"
};

let bullets=[];
let keys={};

document.addEventListener("keydown",e=>keys[e.key]=true);
document.addEventListener("keyup",e=>keys[e.key]=false);

document.addEventListener("click",()=>{
    bullets.push({
        x:player.x,
        y:player.y,
        dx:8
    });
});

function update(){

    if(keys["ArrowUp"]) player.y-=player.speed;
    if(keys["ArrowDown"]) player.y+=player.speed;
    if(keys["ArrowLeft"]) player.x-=player.speed;
    if(keys["ArrowRight"]) player.x+=player.speed;

    bullets.forEach(b=>b.x+=b.dx);

    bullets=bullets.filter(b=>b.x<canvas.width);

    bullets.forEach((b,i)=>{
        if(
            b.x>enemy.x &&
            b.x<enemy.x+enemy.size &&
            b.y>enemy.y &&
            b.y<enemy.y+enemy.size
        ){
            enemy.x=Math.random()*700+50;
            enemy.y=Math.random()*450+25;
            bullets.splice(i,1);
        }
    });
}

function draw(){
    ctx.clearRect(0,0,canvas.width,canvas.height);

    ctx.fillStyle=player.color;
    ctx.fillRect(player.x,player.y,player.size,player.size);

    ctx.fillStyle=enemy.color;
    ctx.fillRect(enemy.x,enemy.y,enemy.size,enemy.size);

    ctx.fillStyle="yellow";
    bullets.forEach(b=>{
        ctx.beginPath();
        ctx.arc(b.x,b.y,5,0,Math.PI*2);
        ctx.fill();
    });
}

function gameLoop(){
    update();
    draw();
    requestAnimationFrame(gameLoop);
}

gameLoop();
</script>

</body>
</html>

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2KB

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2KB

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100.0ms

Dom Content Loaded

112.0ms

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100.0ms

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