本文实例讲述了js+canvas绘制矩形的方法。分享给大家供大家参考，具体如下：
运行效果截图如下：
具体代码如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>canvas绘制矩形</title> <script type="text/javascript" > function draw(id) { var canvas = document.getElementById("canvas"); if (canvas) { var context = canvas.getContext("2d"); context.fillStyle = "#DDDDDD"; context.fillRect(0, 0, 400, 400); context.strokeStyle = "black"; context.fillStyle = "gray"; context.lineWidth = 5; context.fillRect(0,0,200,300); context.strokeRect(0,0,200,200); } else { return; } } function drawBorder(id) { var canvas = document.getElementById("canvas2"); if (canvas) { var context = canvas.getContext("2d"); context.fillStyle = "red"; context.strokeStyle = "black"; context.lineWidth = 5; context.fillRect(0,0, 300, 200); context.strokeRect(0,0,300,200); } else { return; } } window.onload = function () { draw("canvas"); drawBorder("canvas2"); } </script> </head> <body> <canvas id="canvas" width="400" height="400"></canvas> <hr /> <canvas id="canvas2" width="400" height="400"></canvas> </body> </html>
希望本文所述对大家JavaScript程序设计有所帮助。