修复 jsonp post请求参数拼接错误

Author: xilanhuaweidapao

src/common/util/FetchRequest.js

@@ -405,15 +405,16 @@ export var FetchRequest = {
      */
     post: function (url, params, options) {
         options = options || {};
+        url = this._processUrl(url, options);
         if (!this.supportDirectRequest(url, options)) {
             url = url.replace('.json', '.jsonp');
             var config = {
-                url: url += "&_method=POST",
+                url: Util.urlAppend(url, "_method=POST"),
                 data: params
             };
             return RequestJSONPPromise.POST(config);
         }
-        return this._fetch(this._processUrl(url, options), params, options, 'POST');
+        return this._fetch(url, params, options, 'POST');
     },
     /**
      * @function FetchRequest.put