Canvas translate- 平移

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>translate</title>
</head>

<body>
    <canvas id='myCanvas' width='800' height='600'>
        your browser does not support canvas
    </canvas>
    <script type="text/javascript">
    var c = document.getElementById('myCanvas');
    var ctx = c.getContext('2d');
    ctx.beginPath();
    ctx.strokeStyle = '#000000';
    ctx.strokeRect(10, 10, 150, 100);
    ctx.translate(50, 100);
    ctx.beginPath();
    ctx.strokeStyle = '#cccccc';
    ctx.strokeRect(10, 10, 150, 100);
    </script>
</body>

</html>