JS 中向表单填写文件的方法
https://stackoverflow.com/a/56447852
let list = new DataTransfer();
let file = new File(["content"], "filename.jpg");
list.items.add(file);
input.files = list.files;
https://stackoverflow.com/a/56447852
let list = new DataTransfer();
let file = new File(["content"], "filename.jpg");
list.items.add(file);
input.files = list.files;