javascript实现异步上传图片

最近遇到图片上传的需求，由于第一次在移动端尝试写上传，还是小心为上，做了一个简单的demo，便于在此基础之上慢慢完善。

<form id="uploadForm" action="http://storage.test.com/file/upload" method="post" enctype="multipart/form-data">
<input type="hidden" name="key" id="key" value="VTZ18HM64#D_L3WX" />
<input type="file" name="uploadFiles" value="" id="fileImage" multiple='multiple' />
<div class="upload_submit">
<button type="button" id="fileSubmit" class="upload_btn">保存</button>
</div>
</form>

var Fileupload = {
fileInput: $("#fileImage").get(0),
dragDrop: $("#fileDragArea").get(0),
upButton: $("#fileSubmit").get(0),
url: $("#uploadForm").attr("action"),
})(),
//文件上传
funUploadFile: function() {
var self = this;

for (var i = 0, file; file = this.fileFilter[i]; i++) {
(function(file) {
var xhr = new XMLHttpRequest();
if (xhr.upload) {
// 上传中
xhr.upload.addEventListener("progress", function(e) {
self.onProgress(file, e.loaded, e.total);
}, false);
// 文件上传成功或是失败
xhr.onreadystatechange = function(e) {

if (xhr.readyState == 4) {
if (xhr.status == 200) {
self.onSuccess(JSON.parse(xhr.responseText));
self.funDeleteFile(file);
if (!self.fileFilter.length) {
//全部完毕
self.onComplete();
}
} else {
self.onFailure(file, xhr.responseText);
}
}
};

//准备FormData对象
var formData = new FormData();
//将文件放入FormData对象中
formData.append('uploadFiles', file);
// 开始上传
xhr.open("POST", self.url, true);
// xhr.setRequestHeader("Content-Type","multipart/form-data");
xhr.send(formData);
}
})(file);
}

},

init: function() {
var self = this；
//上传按钮提交
if (this.upButton) {
console.log('提示： 当前存储服务器地址', this.url)
this.upButton.addEventListener("click", function(e) {
self.funUploadFile(e);
}, false);
}

self.bindEvent();

}
};
Fileupload = $.extend(Fileupload);
Fileupload.init();