# CanvasContext.setGlobalAlpha(number alpha)

From base library 1.9.90 Start, this interface stops maintenance, please use CanvasContext.globalAlpha replace

with Promise style call: Not supported

Mini Program plugin: Support

Sets global brush transparency.

# parameter

# number alpha

Transparency. range 0-1，0 For complete transparency, 1 Indicates complete opacity.

# sample code

const ctx = wx.createCanvasContext('myCanvas')

ctx.setFillStyle('red')
ctx.fillRect(10, 10, 150, 100)
ctx.setGlobalAlpha(0.2)
ctx.setFillStyle('blue')
ctx.fillRect(50, 50, 150, 100)
ctx.setFillStyle('yellow')
ctx.fillRect(100, 100, 150, 100)

ctx.draw()