// 获取图片对象
export function getImgObj({ canvas, url, callback }) {
  return new Promise((resolve, reject) => {
    wx.downloadFile({
      url,
      success: (res) => {
        if (res.statusCode === 200) {
          loadImage(canvas, res.tempFilePath).then((imgObj) => {
            callback(imgObj)
            resolve()
          })
        }
      },
      fail: (err) => {
        wx.showToast({
          title: '海报资源下载失败',
          icon: 'none',
        })
        reject(err)
      },
    })
  })
}


export function loadImage(canvas, imgSrc) {
  console.log('loadImage -> imgSrc', imgSrc)
  return new Promise((resolve, reject) => {
    let _img = canvas.createImage()
    _img.onload = () => {
      console.log('背景加载')
      resolve(_img)
    }
    _img.onerror = (err) => {
      console.log('加载错误', err)
      wx.showToast({
        title: '海报资源加载失败',
        icon: 'none',
      })
      reject(err)
    }
    _img.src = imgSrc
  })
}

重启大法好。