i am detecting images on my webpage with javascript document.images function which returns an rray of images. Is there any way to get the mime type of the image from this since i am not using any extension names on images which are loading?
我正在用javascript文档检测网页上的图像。图像函数，返回图像的rray。由于我没有在正在加载的图像上使用任何扩展名，有什么方法可以从这里获得图像的mime类型吗?
2 个解决方案
#1
4
I don't think this is possible, apart from requesting the image again in jQuery and trying to use a MIME type check on the data. (You might be able to send a HEAD request and get whatever Content-type was returned)
我认为这是不可能的，除了再次用jQuery请求图像并尝试对数据使用MIME类型检查之外。(您可以发送HEAD请求并获取返回的内容类型)
#2
0
According with other answers, I got pretty surprised to find out it was apparently not possible without requesting the image again. (??? That seems weird to me but oh well…)
根据其他的答案，我很惊讶地发现，如果不再次请求图像，这显然是不可能的。(? ? ?这在我看来似乎很奇怪，但是……
Another hacky-but-might-be-enough-for-your-use-case-solution that comes in my mind would be to:
我脑海中出现的另一种“用黑客的方式”的用例解决方案是:
Parse the img.src in an attempt of guessing the file type.
解析img。尝试猜测文件类型的src。
- "Guessing?" you may ask…
- “猜吗?”你可能会问……
- Yes because the extension might not be included in the
srcor could be misleading. - 是的，因为扩展可能不包含在src中，或者可能具有误导性。
#1
4
I don't think this is possible, apart from requesting the image again in jQuery and trying to use a MIME type check on the data. (You might be able to send a HEAD request and get whatever Content-type was returned)
我认为这是不可能的，除了再次用jQuery请求图像并尝试对数据使用MIME类型检查之外。(您可以发送HEAD请求并获取返回的内容类型)
#2
0
According with other answers, I got pretty surprised to find out it was apparently not possible without requesting the image again. (??? That seems weird to me but oh well…)
根据其他的答案，我很惊讶地发现，如果不再次请求图像，这显然是不可能的。(? ? ?这在我看来似乎很奇怪，但是……
Another hacky-but-might-be-enough-for-your-use-case-solution that comes in my mind would be to:
我脑海中出现的另一种“用黑客的方式”的用例解决方案是:
Parse the img.src in an attempt of guessing the file type.
解析img。尝试猜测文件类型的src。
- "Guessing?" you may ask…
- “猜吗?”你可能会问……
- Yes because the extension might not be included in the
srcor could be misleading. - 是的，因为扩展可能不包含在src中，或者可能具有误导性。