<html>
<body>
<canvas id="myCanvas" width="400" 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");
//Draw a red line at y=100
ctx.strokeStyle="red";
ctx.moveTo(5,100);
ctx.lineTo(395,100);
ctx.stroke();
ctx.font="20px Arial"
//Place each word at y=100 with different textBaseline values
ctx.textBaseline="top";
ctx.fillText("Top",5,100);
ctx.textBaseline="bottom";
ctx.fillText("Bottom",50,100);
ctx.textBaseline="middle";
ctx.fillText("Middle",120,100);
ctx.textBaseline="alphabetic";
ctx.fillText("Alphabetic",190,100);
ctx.textBaseline="hanging";
ctx.fillText("Hanging",290,100);
</script>
</body>
</html>