dataSource clone config should not be overwrited by origin config, fix #200

components/table/demo/ajax.md

@@ -35,6 +35,7 @@ var dataSource = new Table.DataSource({
   resolve: function(result) {
     return result.data;
   },
+  data: {},
   // 和后台接口返回的分页数据进行适配
   getPagination: function(result) {
     return {

components/table/index.jsx

@@ -31,7 +31,7 @@ class DataSource {
   }
 
   clone(config = {}) {
-    return new DataSource(objectAssign(config, this.config));
+    return new DataSource(objectAssign({}, this.config, config));
   }
 }