first, use the upload component of elementUI to save the file to form.picFile and form.corFile respectively, and then new a FormData object at the time of submission, and then append the file, but there is only one file in the data sent. What is the reason, please?
this.param = new FormData();this.param.append("files", this.form.picFile, this.form.picFile.fileName);
this.param.append("files", this.form.corFile, this.form.corFile.fileName); 
modify the answer
there is no problem with the same key name. Mdn is clearly added with'[] 'just for naming habits. So your current problem may be that when you insert the file for the second time, the parameter that does not have the second parameter in form should not have been obtained yet.
two methods can be tested
1.
2.form
multiple file uploads should be written in this way
data.append('file[]', $('.file')[i].file[0]);
this.param.append('files1', this.form.picFile, this.form.picFile.fileName);
this.param.append('files2', this.form.corFile, this.form.corFile.fileName);file-list has multiple values in the upload file upload. How to know the index of the selected value when deleting it ...
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