案例1：rect()与stroke()绘制矩形 · canvas基本功能

# 案例1：rect()与stroke()绘制矩形 ![](https://img.kancloud.cn/27/4b/274bc0053b7dd08d413759bd02c598f8_249x161.png) 相关代码如下： ~~~ <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>canvas</title> </head> <body> <canvas id="myCanvas" width="300" height="400"> 您的浏览器不支持 HTML5 canvas 标签。 </canvas> <script> var c = document.getElementById('myCanvas'); var ctx = c.getContext("2d"); ctx.rect(20, 20, 150, 100); //step1:指定矩形 ctx.stroke(); //step2:绘制 </script> </body> </html> ~~~ >rect()语法：`context.rect(x, y, width, height);`