如何在Canvas中添加事件的方法示例

document.removeEventListener('mouseup', mouseupEvent)
}
}
}

const yes = new demo(canvas)
.rectangular({})
.rectangular({top: 60, left: 60, background: 'blue'})
.rectangular({top: 30, left: 20, background: 'green'})
.circle()
.circle({center: [100, 30], background: 'red', radius: 5})
.painting()