本文實例講述了js+canvas繪制矩形的方法。分享給大家供大家參考，具體如下：
運行效果截圖如下：
具體代碼如下：
<!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繪制矩形</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" style="background:red;" height="400"></canvas><hr /><canvas id="canvas2" width="400" height="400"></canvas></body></html>更多關于JavaScript相關內容感興趣的讀者可查看本站專題：《JavaScript動畫特效與技巧匯總》及《JavaScript運動效果與技巧匯總》
希望本文所述對大家JavaScript程序設計有所幫助。
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