Javascript-how can I get the suffix before uploading an image to Qiniu?

The houzhui in the figure is a user-defined function used to get the image suffix, but it is useless. if it is uploaded to Qiniu, the image name is not displayed, only until the date of $ name is added with a random number, who knows how to get the image suffix?

The houzhui in the figure is a user-defined function used to get the image suffix, but it is useless. the image name is not displayed directly after being uploaded to Qiniu.
Only until the date $ name is added with a random number. Which of the following gods knows how to obtain the image suffix?

Reply content:

The houzhui in the figure is a user-defined function used to get the image suffix, but it is useless. the image name is not displayed directly after being uploaded to Qiniu.
Only until the date $ name is added with a random number. Which of the following gods knows how to obtain the image suffix?

Houzhui ('$ (fname.
This is the case.

$ Fname = "/path/test.png"; echo houzhui ("$ fname"); function houzhui ($ file) {return pathinfo ($ file, PATHINFO_EXTENSION );}

Pathinfo ($ fname, PATHINFO_EXTENSION );