javascript - When I use FormData to submit data, the data does not appear in the background. What did I write wrong?

Question

1. I used FormData to submit data and upload pictures at the front desk, and then obtained the pictures in the background but could not get the picture information. I don’t know where I made a mistake

2. The following is my front-end code

3. This is my php code

4. The following is the message sent by my console

]

5. I don’t know where I made a mistake. Can someone help me look at it?

Answer 1

formData = new FormData($('formid')[0]);

Answer 2

I just did this function, but I used ajax here