要使用HTML5 Canvas创建镜像变换，我们可以在x方向上应用负比例来水平翻转上下文，或者我们可以在y方向上应用负比例来垂直翻转上下文。
html代码：
<!DOCTYPE HTML>
<html>
<head>
<style>
body {
margin: 0px;
padding: 0px;
}
</style>
</head>
<body>
<canvas id="myCanvas" width="578" height="200"></canvas>
<script>
var canvas = document.getElementById('myCanvas');
var context = canvas.getContext('2d');
// translate context to center of canvas
context.translate(canvas.width / 2, canvas.height / 2);
// flip context horizontally
context.scale(-1, 1);
context.font = '30pt Calibri';
context.textAlign = 'center';
context.fillStyle = 'blue';
context.fillText('Hello World!', 0, 0);
</script>
</body>
</html>
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