获取图片信息(宽高)

通过图片地址获取图片信息

const getImgInfo = (url) => {
  return new Promise((resolve, reject) => {
    let img = document.createElement('img')
    img.src = url
    img.onload = () => {
      resolve({ width: img.naturalWidth, height: img.naturalHeight })
    }
    img.onerror = () => {
      reject(new Error('图片加载错误！'))
    }
  })
}
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