CodePen Embed - learn canvas 3-1

<canvas id="mycanvas3" width="400" height="400"></canvas>

let canvas = document.getElementById('mycanvas3')
if (canvas.getContext) {
  let ctx = canvas.getContext('2d')
  ctx.beginPath()
  ctx.moveTo(20,20)
  ctx.lineTo(60, 20)
  ctx.lineTo(40,50)
  ctx.lineTo(20,20)
  ctx.closePath()
  ctx.stroke()
} else {
  console.log('浏览器不支持canvas')
}

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