1、使用离屏 定义如下

const canvas = wx.createOffscreenCanvas({
	type: '2d',
	width: canvasWidth,
	height: canvasHeight
})
const canvasCtx = canvas.getContext('2d')

2、顺利生成

let res = canvasCtx.createImageData(canvasWidth,canvasHeight)

（一点也不顺利的 结果 ）

res 的 值{data: Uint8ClampedArray(1216500), width: 375, height: 811, dataUnion: Uint8ClampedArray(1216500)}

3、问题1 我要怎么用这个数据呢？

4、也无法存下图片，这一步报错

wx.canvasToTempFilePath({
	x: 0,
	y: 0,
	width: canvasWidth,
	height: canvasHeight,
	destWidth: canvasWidth,
	destHeight: canvasHeight,
	canvas: canvas,
	success(res) {
	console.log(res.tempFilePath)
   }
  })

wx.canvasToTempFilePath 这一步的报错信息如下

VM282 WAService.js:2 TypeError: Failed to execute 'drawImage' on 'CanvasRenderingContext2D': The provided value is not of type '(CSSImageValue or HTMLImageElement or SVGImageElement or HTMLVideoElement or HTMLCanvasElement or ImageBitmap or OffscreenCanvas)'