代码
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>慕课网Wiki</title>
<style>
#imooc{
border:1px solid #ccc;
}
</style>
</head>
<body>
<canvas id="imooc">您的浏览器不支持 HTML5 canvas 标签</canvas>
<script>
const canvas = document.getElementById('imooc');
canvas.width=400;
canvas.height=240;
const ctx = canvas.getContext('2d');
ctx.fillStyle="#456795";
ctx.font="20px 微软雅黑";
ctx.beginPath()
ctx.strokeStyle="#ccc";
ctx.moveTo(20,20);
ctx.lineTo(380,20);
ctx.stroke();
ctx.textBaseline="top" //设置基线在文本顶部，文本和基线重合
ctx.fillText("慕课Wiki textBaseline = top", 20,20)
ctx.beginPath()
ctx.strokeStyle="#ccc";
ctx.moveTo(20,60);
ctx.lineTo(380,60);
ctx.stroke();
ctx.textBaseline="hanging" //设置文本悬挂在基线上，文本和基线没有重合
ctx.fillText("慕课Wiki textBaseline = hanging", 20,60)
ctx.beginPath()
ctx.strokeStyle="#ccc";
ctx.moveTo(20,100);
ctx.lineTo(380,100);
ctx.stroke();
ctx.textBaseline="middle" //设置基线在文本中间
ctx.fillText("慕课Wiki textBaseline = middle", 20,100)
ctx.beginPath()
ctx.strokeStyle="#ccc";
ctx.moveTo(20,140);
ctx.lineTo(380,140);
ctx.stroke();
ctx.textBaseline="alphabetic" //标准的字母基线
ctx.fillText("慕课Wiki textBaseline = alphabetic", 20,140)
ctx.beginPath()
ctx.strokeStyle="#ccc";
ctx.moveTo(20,180);
ctx.lineTo(380,180);
ctx.stroke();
ctx.textBaseline="ideographic"
ctx.fillText("慕课Wiki textBaseline = ideographic", 20,180)
ctx.beginPath()
ctx.strokeStyle="#ccc";
ctx.moveTo(20,220);
ctx.lineTo(380,220);
ctx.stroke();
ctx.textBaseline="bottom"
ctx.fillText("慕课Wiki textBaseline = bottom", 20,220)
</script>
<body>
</html>
运行结果