canvas开发工具渲染正常，IOS真机不绘制？
[图片] import { promiseWxApi } from '../../utils/util.js'
Page({
onLoad(options) {
wx.createSelectorQuery()
.select('#canvas1')
.fields({ node: true, size: true })
.exec((res) => {
const canvas = res[0].node
const ctx = canvas.getContext('2d')
const dpr = wx.getSystemInfoSync().pixelRatio
canvas.width = res[0].width * dpr
canvas.height = res[0].height * dpr
ctx.scale(dpr, dpr)
// 绘制背景
ctx.fillStyle = '#ffffff'
ctx.fillRect(0, 0, canvas.width, canvas.height)
// 绘制作品图片
this.renderArtworkImg(canvas, 'https://picasso.pixcity.net/images/artwork/3bxjoy02kz8c320d/a083a60ce340f3bb10927907abb4b5ea/original/wx5e78935c81104646.o6zajszne4uvrcaapzm8n6bsvfni.muhsjfgntmym3ad2f0e5a40aa6b94348bf333e405bf6.jpg')
})
},
async renderArtworkImg(canvas, imgPath) {
const context = canvas.getContext('2d')
const { tempFilePath } = await promiseWxApi(wx.downloadFile)({
url: imgPath
})
const { width: imgWidth, height: imgHeight } = await promiseWxApi(wx.getImageInfo)({
src: tempFilePath
})
const image = canvas.createImage()
image.onload = () => {
context.drawImage(image, 0, 0, imgWidth, imgHeight, 0, 0, canvas.width, 100)
}
// 注意只能是本地图片
image.src = tempFilePath
}
})
