使用 JavaScript Canvas API 创建对称矩形
<!DOCTYPE html>
<html>
<head>
<title>Symmetric Rectangle</title>
</head>
<body>
<canvas id="myCanvas" width="400" height="200"></canvas>
<script>
var canvas = document.getElementById("myCanvas");
var ctx = canvas.getContext("2d");
var centerX = canvas.width / 2;
var centerY = canvas.height / 2;
var rectWidth = 200;
var rectHeight = 100;
ctx.fillStyle = "blue";
ctx.fillRect(centerX - rectWidth / 2, centerY - rectHeight / 2, rectWidth, rectHeight);
ctx.fillStyle = "red";
ctx.fillRect(centerX - rectWidth / 2, centerY + rectHeight / 2, rectWidth, -rectHeight);
</script>
</body>
</html>
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