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实例代码( Tip: 登录后体验更佳 )
运行代码 
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool教程(w3cschool.cn)</title>
</head>
<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");
//在位置150创建一个红色线
ctx.strokeStyle="red";
ctx.moveTo(150,20);
ctx.lineTo(150,170);
ctx.stroke();
ctx.font="15px Arial";    
// 表明不同TextAlign值
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>
 
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运行结果
PC端 手机端 平板端