canvas 绘制坐标轴

结果：
canvas 绘制坐标轴
代码：
<!DOCTYPE html>

<html>

<head lang="en">

  <meta charset="UTF-8">

  <title></title>

  <style>

    body {

      text-align: center;

    }

    canvas {

      background: #ddd;

    }

  </style>

</head>

<body>

  <h3>绘制路径——直线</h3>

  <canvas id="c13" width="500" height="400"></canvas>

  <script>

    var ctx = c13.getContext('2d');

    //绘制X轴

    ctx.beginPath();

    ctx.moveTo(50, 350);

    ctx.lineTo(450, 350);

    ctx.lineTo(450-20, 350-20);

    ctx.moveTo(450, 350);

    ctx.lineTo(450-20, 350+20);

    //ctx.lineJoin = 'miter'; //线的连接处采用尖角

    //ctx.lineJoin = 'bevel'; //线的连接处采用方角

    ctx.lineJoin = 'round'; //线的连接处采用圆角

    ctx.lineWidth = 5;

    ctx.strokeStyle = '#0a0';

    ctx.stroke();

    //绘制Y轴

    ctx.beginPath();  //必须开始新路径

    ctx.moveTo(50, 350);

    ctx.lineTo(50, 50);

    ctx.lineTo(50-20, 50+20);

    ctx.moveTo(50, 50);

    ctx.lineTo(50+20, 50+20);

    ctx.strokeStyle = '#00f';

    ctx.stroke();

  </script>

</body>

</html>
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canvas 绘制坐标轴

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