API函数wx.createCanvasContext(string canvasId, Object this)的参数canvasId为（ ）组件的id？

API函数wx.createCanvasContext(string canvasId, Object this)用于创建 画布的绘图上下文对象（

已知有画布组件：[canvas canvas-id='myCanvas'][/]以下哪句代码可以用于创建该画布的上下文？ A: const ctx=wx.createCanvasContext() B: const ctx=wx.createCanvasContext('canvas') C: const ctx=wx.createCanvasContext('canvasId') D: const ctx=wx.createCanvasContext('canvasId')

API函数wx.createCanvasContext(stringcanvasId,Objectthis)的参数canvasId为()组件的id? A: 画笔 B: 矩形 C: 画布 D: 按钮