xxxxxxxxxx<html><head><meta charset="utf-8"><title>W3Cschool教程(w3cschool.cn)</title></head><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");//在Y = 100画一条红线ctx.strokeStyle="red";ctx.moveTo(5,100);ctx.lineTo(395,100);ctx.stroke();ctx.font="20px Arial"//每个在y = 100的单词有不同的textbaseline值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>