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前端获取后台传过来的图片,前端能计算出图片的占用空间吗?

前端获取后台传过来的图片,前端能计算出图片的占用空间吗?就是一张图片多少kb


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如果是 AJAX 请求的话,取响应头的 Content-Length 就是文件大小的了。


也可以通过 Image 加载的回调取一次:

let image = new Image();
image.onload = function() {
    let width = image.width; // 宽 px
    let height = image.height; // 高 px
    let fileSize = image.fileSize; // 大小 byte
}
image.src = 'XXXXX';

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