h5-18-文件上传

参考博客地址：https://developer.mozilla.org/zh-CN/docs/Web/API/FormData/Using_FormData_Objects

参考博客地址：http://blog.csdn.net/ling_du/article/details/52192322

核心代码

var formElement = document.querySelector('input[type=file]').files[0]');
var formData = new FormData(formElement);
var request = new XMLHttpRequest();
request.open("POST", "submitform.php");
formData.append("serialnumber", serialNumber++);
request.send(formData);