textBaseline

<!DOCTYPE html>
<html>
<body>

<canvas id="myCanvas" width="400" height="200" style="border:1px solid #d3d3d3;">
Your browser does not support the HTML5 canvas tag.</canvas>

var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");

//Draw a red line at y=100
ctx.strokeStyle="blue";
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>

巴特西

textBaseline

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