要重置HTML5 Canvas变换矩阵，我们可以使用setTransform（）方法使用以下约定将变换矩阵设置为其默认状态：
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');
var rectWidth = 150;
var rectHeight = 75;
// translate context to center of canvas
context.translate(canvas.width / 2, canvas.height / 2);
context.fillStyle = 'blue';
context.fillRect(-rectWidth / 2, rectHeight / -2, rectWidth, rectHeight);
// Reset Transform
// 1 0 0
// 0 1 0
// 0 0 1
// apply custom transform
context.setTransform(1, 0, 0, 1, 0, 0);
context.fillStyle = 'red';
context.fillRect(0, 0, rectWidth, rectHeight);
</script>
</body>
</html>
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