[feature] upload data type change from base64 to form data.

Author: wangxiao

lib/file.js

@@ -336,6 +336,7 @@ module.exports = function(AV) {
     } else if (typeof(File) !== "undefined" && data instanceof File) {
       this._source = readAsync(data, type);
       this._isFileObject = true;
+      this._fileObject = data;
     } else if(AV._isNode && global.Buffer.isBuffer(data)) {
       // use global.Buffer to prevent browserify pack Buffer module
       this._source = AV.Promise.as(data.toString('base64'), guessedType);
@@ -545,7 +546,7 @@ module.exports = function(AV) {
      * @param {Object} options A Backbone-style options object.
      * @return {AV.Promise} Promise that is resolved when the save finishes.
      */
-save: function() {
+    save: function() {
       var options = null;
       var saveOptions = {};
       if(arguments.length === 1) {
@@ -561,7 +562,7 @@ save: function() {
             // TODO: remove this code and use qiniu SDK
             var dataFormat;
             self._previousSave = self._source.then(function(data, type) {
-              dataFormat = data;
+              dataFormat = self._fileObject || data;
               return self._qiniuToken(type);
             }).then(function(response) {
               self._url = response.url;