在require.js模块中上传web生成的图像

I am using a web labeling tool to generate image from the website, however I want to modify the function so that when I am done with labeling, instead of downloading the image to local, I want it to be uploaded into server. The function is in a javascript file and all the upload associated with JS has to do with submitting forms. There is no form and super globals, how am I supposed to upload a web generated image to server?I am using a web labeling tool to generate imag