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context: context? ?? ??? ??? ???? ?????. ? ??? ?? ??? var context =canvas.getContext("2d");

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context.fill()//Fill

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context.Stroke()//??? ???

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context.fillStyle//??? ???

context.StrokeStyle//??? ???

context.lineWidth//??? ??? ??

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?? ?? ?? ??: "red" "green" "blue"

16?? ??? ?? ?? ?: "#EEEEFF"

rgb(1-255,1-255,1-255)

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<!DOCTYPE html> <html> <head>  <meta charset="utf-8">  <title>php中文網</title>  </head> <body> <canvas id="demoCanvas" width="500" height="500"> <p>請使用支持HTML5的瀏覽器查看本實例</p> </canvas> <!---下面將演示一種繪制矩形的demo---> <script type="text/javascript"> //第一步：獲取canvas元素 var canvasDom = document.getElementById("demoCanvas"); //第二步：獲取上下文 var context = canvasDom.getContext('2d'); //第三步：指定繪制線樣式、顏色 context.strokeStyle = "red"; //第四步：繪制矩形，只有線。內容是空的 context.strokeRect(10, 10, 190, 100); //以下演示填充矩形。 context.fillStyle = "blue"; context.fillRect(110,110,100,100); </script> </body> </html>