CNN84school在线测试工具 - 语法例子使用教程参考手册运行参数

编辑您的代码：	查看结果:
<!DOCTYPE html> <html> <body> <canvas id="myCanvas" width="300" height="150" style="border:1px solid #d3d3d3;"> Your browser does not support the HTML5 canvas tag. </canvas> <script> var c=document.getElementById("myCanvas"); var ctx=c.getContext("2d"); ctx.fillRect(20,20,150,100); </script> </body> </html>

查看结果: