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Context ??? BeginPath ???? ?? ??? ??? ????, moveTo(x, y) ???? ??? ?????? ????, lineTo(x, y) ???? ??? ????? ?????. , ??? ??? ???? ?? ? ??? ?????. moveto ? lineto ???? ?? ? ??? ? ????. ????? closePath ???? ???? ?? ??? ????? ???? ??? ?? ?? ??? ??? ? ???? lineto ???? ? ? ??? ??? ????.

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<body>
    <canvas id="demoCanvas" width="500" height="600">
    </canvas>
    <script type="text/javascript">
        //通過id獲得當(dāng)前的Canvas對象
        var canvasDom = document.getElementById("demoCanvas");
        //通過Canvas Dom對象獲取Context的對象
        var context = canvasDom.getContext("2d");
        context.beginPath(); // 開始路徑繪制
        context.moveTo(20, 20); // 設(shè)置路徑起點(diǎn)，坐標(biāo)為(20,20)
        context.lineTo(200, 200); // 繪制一條到(200,20)的直線
        context.lineTo(400, 20);
        context.closePath();
        context.lineWidth = 2.0; // 設(shè)置線寬
        context.strokeStyle = "#CC0000"; // 設(shè)置線的顏色
        context.stroke(); // 進(jìn)行線的著色，這時(shí)整條線才變得可見
    </script>
</body>
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<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>huatu</title> <body> <canvas id="demoCanvas" width="500" height="600"> </canvas> <script type="text/javascript"> //通過id獲得當(dāng)前的Canvas對象 var canvasDom = document.getElementById("demoCanvas"); //通過Canvas Dom對象獲取Context的對象 var context = canvasDom.getContext("2d"); context.beginPath(); // 開始路徑繪制 context.moveTo(20, 20); // 設(shè)置路徑起點(diǎn)，坐標(biāo)為(20,20) context.lineTo(200, 200); // 繪制一條到(200,20)的直線 context.lineTo(400, 20); context.closePath(); context.lineWidth = 2.0; // 設(shè)置線寬 context.strokeStyle = "#CC0000"; // 設(shè)置線的顏色 context.stroke(); // 進(jìn)行線的著色，這時(shí)整條線才變得可見 </script> </body> </html>