baseutil request异步参数配置项逻辑

frontend/saas-web/app/util/BaseUtil.js

@@ -143,7 +143,7 @@ Ext.define('saas.util.BaseUtil', {
         request: function (config) {
             var url = config.url,
                 params = config.params,
-                async = config.async || true,
+                async = Ext.isBoolean(config.async) ? config.async : true,
                     method = config.method || 'GET',
                     timeout = config.timeout || 8000,
                     defaultHeaders = {