# CanvasContext wx.createCanvasContext(string canvasId, Object this)
From base library 2.9.0 Start, this interface stops maintenance, please use Canvas replace
with Promise style call: Not supported
Mini Program plugin: Support, need to Mini Program base library version no less than 1.9.6
create canvas Drawing context CanvasContext object
# parameter
# string canvasId
To get the context canvas assembly canvas-id attribute
# Object this
Under a custom component, this for the current component instance, indicates that under this custom component the lookup for the canvas-id of canvas If omitted, does not look inside any custom components