let ctx1 = wx.createCanvasContext(‘tm1’)

    ctx1.beginPath()

    ctx1.moveTo(0, 100)

    ctx1.lineTo(300, 100)

    ctx1.moveTo(150, 0)

    ctx1.lineTo(150, 200)

    ctx1.stroke()

    ctx1.beginPath()

    ctx1.arc(150, 100, 80, 0, 2 * Math.PI)

    ctx1.stroke()

    ctx1.draw()

https://developers.weixin.qq.com/miniprogram/dev/api/canvas/CanvasContext.stroke.html