new FormData() 相關用法

 1.simple demo :

var form = document.forms.namedItem("fileinfo"); form.addEventListener('submit', function(ev) { var oOutput = document.querySelector("div"),  oData = new FormData(form);//form just origin js object oData.append("CustomField", "This is some extra data"); var oReq = new XMLHttpRequest(); oReq.open("POST", "stash.php", true); oReq.onload = function(oEvent) { if (oReq.status == 200) { oOutput.innerHTML = "Uploaded!"; } else { oOutput.innerHTML = "Error " + oReq.status + " occurred when trying to upload your file.<br \/>"; } }; oReq.send(oData); ev.preventDefault(); }, false);

2.referer:更復雜的其它方式 上傳文件和表單

https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/Using_XMLHttpRequest#Submitting_forms_and_uploading_files