线条连接

代码运行

<!DOCTYPE HTML>
<html>
  <head>
    <title>线条链接</title>
    <style>
      body {
        margin: 0px;
        padding: 0px;
      }
    </style>
  </head>
  <body>
    <canvas id="myCanvas" width="578" height="200"></canvas>
    <script>
      var canvas = document.getElementById('myCanvas');
      var context = canvas.getContext('2d');

// set line width for all lines
      context.lineWidth = 25;

// miter line join (left)
      context.beginPath();
      context.moveTo(99, 150);
      context.lineTo(149, 50);
      context.lineTo(199, 150);
      context.lineJoin = 'miter';
      context.stroke();

// round line join (middle)
      context.beginPath();
      context.moveTo(239, 150);
      context.lineTo(289, 50);
      context.lineTo(339, 150);
      context.lineJoin = 'round';
      context.stroke();

// bevel line join (right)
      context.beginPath();
      context.moveTo(379, 150);
      context.lineTo(429, 50);
      context.lineTo(479, 150);
      context.lineJoin = 'bevel';
      context.stroke();
    </script>
  </body>
</html>