要移除点击事件

this.startTouchEventBind = this.startTouchEventHandle.bind(this)
this.moveTouchEventBind = this.moveTouchEventHandle.bind(this)
this.endTouchEventBind = this.endTouchEventHandle.bind(this)

canvas.removeEventListener('touchstart', this.startTouchEventBind)
canvas.removeEventListener('touchmove', this.moveTouchEventBind)
canvas.removeEventListener('touchend', this.endTouchEventBind)