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<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
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<body>
<canvas width="600" height="400"></canvas>
<script>
var pantalla = document.querySelector("canvas");
var pincel = pantalla.getContext("2d");
pincel.fillStyle = "lightgray";
pincel.fillRect(0, 0, 600, 400);
function dibujarCirculo(x, y, radio, color) {
pincel.fillStyle = color;
pincel.beginPath();
pincel.arc(x, y, radio, 0, 2 * 3.14);
pincel.fill();
}
dibujarCirculo(300, 200, 50, "red")
dibujarCirculo(200, 200, 50, "orange")
dibujarCirculo(400, 200, 50, "black")
dibujarCirculo(300, 100, 50, "yellow")
dibujarCirculo(300, 300, 50, "blue")
</script>
</body>
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