js通过Image()获取图片尺寸

注意需要在浏览器中使用，需要加载dom对象才能生效，如果直接使用jest将会报错超时

export const getImgSize = (url: string): Promise<object> => {
    return new Promise((resolve) => {
        let imgObj = new Image()
        imgObj.src = url
        imgObj.onload = () => {
            resolve({
                width: imgObj.width,
                height: imgObj.height
            })
        }
    })
}