<html>
<body>
<canvas id="myCanvas" width="300" height="200" style="border:1px solid #d3d3d3;">
您的浏览器不支持 HTML5 canvas 标签。</canvas>
<script>
var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
// Create a red line in position 150
ctx.strokeStyle="red";
ctx.moveTo(150,20);
ctx.lineTo(150,170);
ctx.stroke();
ctx.font="15px Arial";
// Show the different textAlign values
ctx.textAlign="start";
ctx.fillText("textAlign=start",150,60);
ctx.textAlign="end";
ctx.fillText("textAlign=end",150,80);
ctx.textAlign="left";
ctx.fillText("textAlign=left",150,100);
ctx.textAlign="center";
ctx.fillText("textAlign=center",150,120);
ctx.textAlign="right";
ctx.fillText("textAlign=right",150,140);
</script>
</body>
</html>