为何不能换行呢

来源：6-2 编程练习

qq_慕九州2374973

2020-02-28 10:46:10

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>canvas字体</title>
<style>
canvas{background-color:lightblue;}
</style>
</head>
<body>
<canvas id="canvas" width="800px" height="800px">您的浏览器不支持canvas
</canvas>
<script>
var canvas=document.getElementById("canvas");
var context=canvas.getContext('2d');
//此处补充代码
var str = "前端路径课程";
context.font = "bold 20px sans-serif";
var width = context.measureText(str).width;

str = str + " \n " +"字体的width是："+ width + "px";
context.textAlign = "center";
context.textBaseline = "middle";
context.fillStyle = "blue";
context.fillText(str,400,400);
</script>
</body>
</html>