canvas 绘制二次贝塞尔曲线

代码：

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>canvas</title>

    <script>

        function init() {

            var canvas=document.getElementById('canvas');

            var ctx=canvas.getContext('2d');

            ctx.strokeStyle="dark";

            ctx.beginPath();

            ctx.moveTo(0,200);

            ctx.quadraticCurveTo(75,50,300,200);

            ctx.stroke();

            ctx.globalCompositeOperation="source-over";

            ctx.strokeStyle="blue";

            ctx.beginPath();

            ctx.moveTo(75,50);

            ctx.lineTo(0,200);

            ctx.moveTo(75,50);

            ctx.lineTo(300,200);

            ctx.stroke();

        }

    </script>

</head>

<body  onload="init();">

<canvas  id="canvas"  width="400"   height="400"></canvas>

</body>

</html>

　　效果：

2017-09-09 11:30:18

巴特西

canvas 绘制二次贝塞尔曲线

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