ajax Miltipart FormData - 在一个请求中上传数据和文件

I would like to upload both files(images and PDF files) and data(select box values and input fields) with one ajax call. Ive got to the stage where i can successfully upload the two files i need but i am having great difficulty appending the values within the input and select tags to the FormData object. I would like to upload both files(images and PD